diff --git a/micropython/examples/breakout_as7262/demo.py b/micropython/examples/breakout_as7262/demo.py
index f6fdd8d7..da100888 100644
--- a/micropython/examples/breakout_as7262/demo.py
+++ b/micropython/examples/breakout_as7262/demo.py
@@ -1,7 +1,12 @@
 import time
+from pimoroni_i2c import PimoroniI2C
 from breakout_as7262 import BreakoutAS7262
 
-as7262 = BreakoutAS7262()
+PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
+PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}
+
+i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
+as7262 = BreakoutAS7262(i2c)
 
 dev_type = as7262.device_type()
 hw_version = as7262.hardware_version()
diff --git a/micropython/examples/breakout_dotmatrix/bargraph.py b/micropython/examples/breakout_dotmatrix/bargraph.py
index 665e1a6f..e80f4aec 100644
--- a/micropython/examples/breakout_dotmatrix/bargraph.py
+++ b/micropython/examples/breakout_dotmatrix/bargraph.py
@@ -2,9 +2,14 @@ import time
 import math
 import random
 
+from pimoroni_i2c import PimoroniI2C
 from breakout_dotmatrix import BreakoutDotMatrix
 
-display = BreakoutDotMatrix()
+PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
+PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}
+
+i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
+display = BreakoutDotMatrix(i2c)
 width = display.WIDTH
 height = display.HEIGHT
 
diff --git a/micropython/examples/breakout_dotmatrix/eyes.py b/micropython/examples/breakout_dotmatrix/eyes.py
index 7d0b0484..e625f1e4 100644
--- a/micropython/examples/breakout_dotmatrix/eyes.py
+++ b/micropython/examples/breakout_dotmatrix/eyes.py
@@ -1,10 +1,15 @@
-import math
 import time
+import math
 import random
 
+from pimoroni_i2c import PimoroniI2C
 from breakout_dotmatrix import BreakoutDotMatrix
 
-display = BreakoutDotMatrix()
+PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
+PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}
+
+i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
+display = BreakoutDotMatrix(i2c)
 start_time = time.time()
 
 
diff --git a/micropython/examples/breakout_dotmatrix/image.py b/micropython/examples/breakout_dotmatrix/image.py
index f1af07ae..31e7acfe 100644
--- a/micropython/examples/breakout_dotmatrix/image.py
+++ b/micropython/examples/breakout_dotmatrix/image.py
@@ -1,9 +1,14 @@
 import time
 import math
 
+from pimoroni_i2c import PimoroniI2C
 from breakout_dotmatrix import BreakoutDotMatrix
 
-display = BreakoutDotMatrix()
+PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
+PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}
+
+i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
+display = BreakoutDotMatrix(i2c)
 
 #        Left Image     Padding  Right Image    Padding
 image = [0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0,
diff --git a/micropython/examples/breakout_dotmatrix/timer.py b/micropython/examples/breakout_dotmatrix/timer.py
index c32db6cf..d420f4ec 100644
--- a/micropython/examples/breakout_dotmatrix/timer.py
+++ b/micropython/examples/breakout_dotmatrix/timer.py
@@ -1,11 +1,16 @@
 import time
 
+from pimoroni_i2c import PimoroniI2C
 from breakout_dotmatrix import BreakoutDotMatrix
 
+PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
+PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}
+
 address = 0x61
 start_time = time.time()
 
-display = BreakoutDotMatrix(address=address)
+i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
+display = BreakoutDotMatrix(i2c, address=address)
 display.clear()
 display.show()
 
diff --git a/micropython/examples/breakout_encoder/demo.py b/micropython/examples/breakout_encoder/demo.py
index c8337453..848e4192 100644
--- a/micropython/examples/breakout_encoder/demo.py
+++ b/micropython/examples/breakout_encoder/demo.py
@@ -1,8 +1,13 @@
+from pimoroni_i2c import PimoroniI2C
 from breakout_encoder import BreakoutEncoder
 
+PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
+PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}
+
 steps_per_rev = 24
 
-enc = BreakoutEncoder()
+i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
+enc = BreakoutEncoder(i2c)
 
 enc.set_brightness(1.0)
 # enc.set_direction(BreakoutEncoder.DIRECTION_CCW)     # Uncomment this to flip the direction
diff --git a/micropython/examples/breakout_ioexpander/adc.py b/micropython/examples/breakout_ioexpander/adc.py
index 290a83ba..f66a9274 100644
--- a/micropython/examples/breakout_ioexpander/adc.py
+++ b/micropython/examples/breakout_ioexpander/adc.py
@@ -1,9 +1,14 @@
 import time
+from pimoroni_i2c import PimoroniI2C
 from breakout_ioexpander import BreakoutIOExpander
 
+PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
+PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}
+
 ioe_adc_pin = 10
 
-ioe = BreakoutIOExpander(0x18)
+i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
+ioe = BreakoutIOExpander(i2c, address=0x18)
 
 ioe.set_mode(ioe_adc_pin, BreakoutIOExpander.PIN_ADC)
 
diff --git a/micropython/examples/breakout_ioexpander/button.py b/micropython/examples/breakout_ioexpander/button.py
index 624306a6..1955073b 100644
--- a/micropython/examples/breakout_ioexpander/button.py
+++ b/micropython/examples/breakout_ioexpander/button.py
@@ -1,9 +1,14 @@
 import time
+from pimoroni_i2c import PimoroniI2C
 from breakout_ioexpander import BreakoutIOExpander
 
+PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
+PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}
+
 ioe_button_pin = 14
 
-ioe = BreakoutIOExpander(0x18)
+i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
+ioe = BreakoutIOExpander(i2c, address=0x18)
 
 ioe.set_mode(ioe_button_pin, BreakoutIOExpander.PIN_IN_PU)
 
diff --git a/micropython/examples/breakout_ioexpander/servo.py b/micropython/examples/breakout_ioexpander/servo.py
index 7ca012fc..622fe0ab 100644
--- a/micropython/examples/breakout_ioexpander/servo.py
+++ b/micropython/examples/breakout_ioexpander/servo.py
@@ -1,7 +1,11 @@
 import time
 import math
+from pimoroni_i2c import PimoroniI2C
 from breakout_ioexpander import BreakoutIOExpander
 
+PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
+PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}
+
 ioe_servo_pin = 1
 
 # Settings to produce a 50Hz output from the 24MHz clock.
@@ -12,7 +16,8 @@ period = 60000
 cycle_time = 5.0
 servo_range = 1000.0    # Between 1000 and 2000us (1-2ms)
 
-ioe = BreakoutIOExpander(0x18)
+i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
+ioe = BreakoutIOExpander(i2c, address=0x18)
 
 ioe.set_pwm_period(period)
 ioe.set_pwm_control(divider)
diff --git a/micropython/examples/breakout_ltr559/demo.py b/micropython/examples/breakout_ltr559/demo.py
index 7f79f67d..a027de45 100644
--- a/micropython/examples/breakout_ltr559/demo.py
+++ b/micropython/examples/breakout_ltr559/demo.py
@@ -1,7 +1,12 @@
 import time
+from pimoroni_i2c import PimoroniI2C
 from breakout_ltr559 import BreakoutLTR559
 
-ltr = BreakoutLTR559()
+PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
+PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}
+
+i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
+ltr = BreakoutLTR559(i2c)
 
 part_id = ltr.part_id()
 print("Found LTR559. Part ID: 0x", '{:02x}'.format(part_id), sep="")
diff --git a/micropython/examples/breakout_matrix11x7/demo.py b/micropython/examples/breakout_matrix11x7/demo.py
index 47c83677..07554c51 100644
--- a/micropython/examples/breakout_matrix11x7/demo.py
+++ b/micropython/examples/breakout_matrix11x7/demo.py
@@ -1,9 +1,14 @@
 import time
+from pimoroni_i2c import PimoroniI2C
 from breakout_matrix11x7 import BreakoutMatrix11x7
 
 on_brightness = 64
 
-matrix = BreakoutMatrix11x7()
+PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
+PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}
+
+i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
+matrix = BreakoutMatrix11x7(i2c)
 
 x = 0
 y = 0
diff --git a/micropython/examples/breakout_mics6814/demo.py b/micropython/examples/breakout_mics6814/demo.py
index b8af41c6..cdd8c08a 100644
--- a/micropython/examples/breakout_mics6814/demo.py
+++ b/micropython/examples/breakout_mics6814/demo.py
@@ -1,9 +1,14 @@
 import time
+from pimoroni_i2c import PimoroniI2C
 from breakout_mics6814 import BreakoutMICS6814
 
 OUTPUT_FREQUENCY = 0.5
 
-gas = BreakoutMICS6814()
+PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
+PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}
+
+i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
+gas = BreakoutMICS6814(i2c)
 
 gas.set_brightness(1.0)
 
diff --git a/micropython/examples/breakout_msa301/demo.py b/micropython/examples/breakout_msa301/demo.py
index 703915a3..cb2c9792 100644
--- a/micropython/examples/breakout_msa301/demo.py
+++ b/micropython/examples/breakout_msa301/demo.py
@@ -1,7 +1,12 @@
 import time
+from pimoroni_i2c import PimoroniI2C
 from breakout_msa301 import BreakoutMSA301
 
-msa = BreakoutMSA301()
+PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
+PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}
+
+i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
+msa = BreakoutMSA301(i2c)
 
 part_id = msa.part_id()
 print("Found MSA301. Part ID: 0x", '{:02x}'.format(part_id), sep="")
diff --git a/micropython/examples/breakout_potentiometer/demo.py b/micropython/examples/breakout_potentiometer/demo.py
index ec354b72..81cbfb2b 100644
--- a/micropython/examples/breakout_potentiometer/demo.py
+++ b/micropython/examples/breakout_potentiometer/demo.py
@@ -1,7 +1,12 @@
 import time
+from pimoroni_i2c import PimoroniI2C
 from breakout_potentiometer import BreakoutPotentiometer
 
-pot = BreakoutPotentiometer()
+PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
+PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}
+
+i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
+pot = BreakoutPotentiometer(i2c)
 
 pot.set_brightness(1.0)
 # pot.set_direction(BreakoutPotentiometer.DIRECTION_CCW)     # Uncomment this to flip the direction
diff --git a/micropython/examples/breakout_rgbmatrix5x5/demo.py b/micropython/examples/breakout_rgbmatrix5x5/demo.py
index c5862842..5f486b79 100644
--- a/micropython/examples/breakout_rgbmatrix5x5/demo.py
+++ b/micropython/examples/breakout_rgbmatrix5x5/demo.py
@@ -1,14 +1,19 @@
 import time
+from pimoroni_i2c import PimoroniI2C
 from breakout_rgbmatrix5x5 import BreakoutRGBMatrix5x5
 
+PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
+PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}
+
+i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
+matrix = BreakoutRGBMatrix5x5(i2c)
+
 colors = []
 colors.append((255, 0, 0))
 colors.append((0, 255, 0))
 colors.append((0, 0, 255))
 colors.append((128, 128, 128))
 
-matrix = BreakoutRGBMatrix5x5()
-
 x = 0
 y = 0
 col = 0
diff --git a/micropython/examples/breakout_rtc/demo.py b/micropython/examples/breakout_rtc/demo.py
index a1c19fa3..cc24b6ca 100644
--- a/micropython/examples/breakout_rtc/demo.py
+++ b/micropython/examples/breakout_rtc/demo.py
@@ -1,8 +1,12 @@
+from pimoroni_i2c import PimoroniI2C
 from breakout_rtc import BreakoutRTC
 import time
 
-# rtc = BreakoutRTC(sda=4, scl=5)  # i2c pins 4, 5 for Breakout Garden
-rtc = BreakoutRTC()                # Default i2c pins for Pico Explorer
+PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}  # i2c pins 4, 5 for Breakout Garden
+PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}  # Default i2c pins for Pico Explorer
+
+i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
+rtc = BreakoutRTC(i2c)
 
 if rtc.is_12_hour():
     rtc.set_24_hour()
diff --git a/micropython/examples/breakout_sgp30/demo.py b/micropython/examples/breakout_sgp30/demo.py
index 4894b167..2a316bdb 100644
--- a/micropython/examples/breakout_sgp30/demo.py
+++ b/micropython/examples/breakout_sgp30/demo.py
@@ -1,8 +1,12 @@
 import time
+from pimoroni_i2c import PimoroniI2C
 from breakout_sgp30 import BreakoutSGP30
 
-# sgp30 = BreakoutSGP30(sda=4, scl=5)  # i2c pins 4, 5 for Breakout Garden
-sgp30 = BreakoutSGP30()                # Default i2c pins for Pico Explorer
+PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}  # i2c pins 4, 5 for Breakout Garden
+PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}  # Default i2c pins for Pico Explorer
+
+i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
+sgp30 = BreakoutSGP30(i2c)
 
 print("SGP30 initialised - about to start measuring without waiting")
 
diff --git a/micropython/examples/breakout_trackball/demo.py b/micropython/examples/breakout_trackball/demo.py
index e846b6c6..5d726ee1 100644
--- a/micropython/examples/breakout_trackball/demo.py
+++ b/micropython/examples/breakout_trackball/demo.py
@@ -1,12 +1,19 @@
 import time
+from pimoroni_i2c import PimoroniI2C
 from breakout_trackball import BreakoutTrackball
 
+PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5, "baudrate": 100000}
+PINS_PICO_EXPLORER = {"sda": 20, "scl": 21, "baudrate": 100000}
+
 sensitivity = 2
 
-trackball = BreakoutTrackball()
+i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
+trackball = BreakoutTrackball(i2c)
 
 trackball.set_rgbw(0, 0, 0, 64)
 
+print("Roll the trackball to change colour!")
+
 while True:
     state = trackball.read()
     if state[BreakoutTrackball.SW_PRESSED]:
diff --git a/micropython/modules/breakout_as7262/breakout_as7262.cpp b/micropython/modules/breakout_as7262/breakout_as7262.cpp
index 62dd291b..7942a0b1 100644
--- a/micropython/modules/breakout_as7262/breakout_as7262.cpp
+++ b/micropython/modules/breakout_as7262/breakout_as7262.cpp
@@ -11,6 +11,13 @@ using namespace pimoroni;
 
 extern "C" {
 #include "breakout_as7262.h"
+#include "pimoroni_i2c.h"
+
+/***** I2C Struct *****/
+typedef struct _PimoroniI2C_obj_t {
+    mp_obj_base_t base;
+    I2C *i2c;
+} _PimoroniI2C_obj_t;
 
 /***** Variables Struct *****/
 typedef struct _breakout_as7262_BreakoutAS7262_obj_t {
@@ -44,11 +51,9 @@ void BreakoutAS7262_print(const mp_print_t *print, mp_obj_t self_in, mp_print_ki
 mp_obj_t BreakoutAS7262_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
     breakout_as7262_BreakoutAS7262_obj_t *self = nullptr;
 
-    enum { ARG_i2c, ARG_sda, ARG_scl, ARG_int };
+    enum { ARG_i2c, ARG_int };
     static const mp_arg_t allowed_args[] = {
-        { MP_QSTR_i2c, MP_ARG_INT, {.u_int = -1} },
-        { MP_QSTR_sda, MP_ARG_INT, {.u_int = I2C_DEFAULT_SDA} },
-        { MP_QSTR_scl, MP_ARG_INT, {.u_int = I2C_DEFAULT_SCL} },
+        { MP_QSTR_i2c, MP_ARG_OBJ, {.u_obj = nullptr} },
         { MP_QSTR_interrupt, MP_ARG_INT, {.u_int = PIN_UNUSED} },
     };
 
@@ -56,33 +61,21 @@ mp_obj_t BreakoutAS7262_make_new(const mp_obj_type_t *type, size_t n_args, size_
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
     mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
-    // Get I2C bus.
-    int i2c_id = args[ARG_i2c].u_int;
-    int sda = args[ARG_sda].u_int;
-    int scl = args[ARG_scl].u_int;
 
-    if(i2c_id == -1) {
-        i2c_id = (sda >> 1) & 0b1;  // If no i2c specified, choose the one for the given SDA pin
-    }
-    if(i2c_id < 0 || i2c_id > 1) {
-        mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("I2C(%d) doesn't exist"), i2c_id);
+    if(!MP_OBJ_IS_TYPE(args[ARG_i2c].u_obj, &PimoroniI2C_type)) {
+        mp_raise_ValueError(MP_ERROR_TEXT("BreakoutAS7262: Bad i2C object"));
+        return mp_const_none;
     }
 
-    if(!IS_VALID_SDA(i2c_id, sda)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SDA pin"));
-    }
-
-    if(!IS_VALID_SCL(i2c_id, scl)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SCL pin"));
-    }
+    _PimoroniI2C_obj_t *i2c = (_PimoroniI2C_obj_t *)MP_OBJ_TO_PTR(args[ARG_i2c].u_obj);
 
     self = m_new_obj(breakout_as7262_BreakoutAS7262_obj_t);
     self->base.type = &breakout_as7262_BreakoutAS7262_type;
 
-    self->breakout = new BreakoutAS7262(sda, scl, args[ARG_int].u_int);
+    self->breakout = new BreakoutAS7262(i2c->i2c, args[ARG_int].u_int);
 
     if(!self->breakout->init()) {
-        mp_raise_msg(&mp_type_RuntimeError, "AS7262 breakout not found when initialising");
+        mp_raise_msg(&mp_type_RuntimeError, "BreakoutAS7262: breakout not found when initialising");
     }
 
     return MP_OBJ_FROM_PTR(self);
diff --git a/micropython/modules/breakout_dotmatrix/breakout_dotmatrix.cpp b/micropython/modules/breakout_dotmatrix/breakout_dotmatrix.cpp
index 6a66a7f6..de9fca75 100644
--- a/micropython/modules/breakout_dotmatrix/breakout_dotmatrix.cpp
+++ b/micropython/modules/breakout_dotmatrix/breakout_dotmatrix.cpp
@@ -12,6 +12,13 @@ using namespace pimoroni;
 
 extern "C" {
 #include "breakout_dotmatrix.h"
+#include "pimoroni_i2c.h"
+
+/***** I2C Struct *****/
+typedef struct _PimoroniI2C_obj_t {
+    mp_obj_base_t base;
+    I2C *i2c;
+} _PimoroniI2C_obj_t;
 
 /***** Variables Struct *****/
 typedef struct _breakout_dotmatrix_BreakoutDotMatrix_obj_t {
@@ -47,42 +54,27 @@ void BreakoutDotMatrix_print(const mp_print_t *print, mp_obj_t self_in, mp_print
 mp_obj_t BreakoutDotMatrix_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
     breakout_dotmatrix_BreakoutDotMatrix_obj_t *self = nullptr;
 
-    enum { ARG_i2c, ARG_address, ARG_sda, ARG_scl };
+    enum { ARG_i2c, ARG_address };
     static const mp_arg_t allowed_args[] = {
-        { MP_QSTR_i2c, MP_ARG_INT, {.u_int = -1} },
+        { MP_QSTR_i2c, MP_ARG_OBJ, {.u_obj = nullptr} },
         { MP_QSTR_address, MP_ARG_INT, {.u_int = BreakoutDotMatrix::DEFAULT_I2C_ADDRESS} },
-        { MP_QSTR_sda, MP_ARG_INT, {.u_int = I2C_DEFAULT_SDA} },
-        { MP_QSTR_scl, MP_ARG_INT, {.u_int = I2C_DEFAULT_SCL} },
     };
 
     // Parse args.
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
     mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
-    // Get I2C bus.
-    int i2c_id = args[ARG_i2c].u_int;
-    int sda = args[ARG_sda].u_int;
-    int scl = args[ARG_scl].u_int;
-
-    if(i2c_id == -1) {
-        i2c_id = (sda >> 1) & 0b1;  // If no i2c specified, choose the one for the given SDA pin
-    }
-    if(i2c_id < 0 || i2c_id > 1) {
-        mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("I2C(%d) doesn't exist"), i2c_id);
+    if(!MP_OBJ_IS_TYPE(args[ARG_i2c].u_obj, &PimoroniI2C_type)) {
+        mp_raise_ValueError(MP_ERROR_TEXT("BreakoutDotMatrix: Bad i2C object"));
+        return mp_const_none;
     }
 
-    if(!IS_VALID_SDA(i2c_id, sda)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SDA pin"));
-    }
-
-    if(!IS_VALID_SCL(i2c_id, scl)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SCL pin"));
-    }
+    _PimoroniI2C_obj_t *i2c = (_PimoroniI2C_obj_t *)MP_OBJ_TO_PTR(args[ARG_i2c].u_obj);
 
     self = m_new_obj(breakout_dotmatrix_BreakoutDotMatrix_obj_t);
     self->base.type = &breakout_dotmatrix_BreakoutDotMatrix_type;
     
-    self->breakout = new BreakoutDotMatrix(args[ARG_address].u_int, sda, scl);
+    self->breakout = new BreakoutDotMatrix(i2c->i2c, args[ARG_address].u_int);
 
     if(!self->breakout->init()) {
         mp_raise_msg(&mp_type_RuntimeError, "DotMatrix breakout not found when initialising");
diff --git a/micropython/modules/breakout_encoder/breakout_encoder.cpp b/micropython/modules/breakout_encoder/breakout_encoder.cpp
index 2bd3b86d..314bf86b 100644
--- a/micropython/modules/breakout_encoder/breakout_encoder.cpp
+++ b/micropython/modules/breakout_encoder/breakout_encoder.cpp
@@ -69,7 +69,7 @@ mp_obj_t BreakoutEncoder_make_new(const mp_obj_type_t *type, size_t n_args, size
     mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
     if(!MP_OBJ_IS_TYPE(args[ARG_i2c].u_obj, &PimoroniI2C_type)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad i2C object"));
+        mp_raise_ValueError(MP_ERROR_TEXT("BreakoutEncoder: Bad i2C object"));
         return mp_const_none;
     }
 
@@ -81,7 +81,7 @@ mp_obj_t BreakoutEncoder_make_new(const mp_obj_type_t *type, size_t n_args, size
     self->breakout = new BreakoutEncoder(i2c->i2c, args[ARG_address].u_int, args[ARG_interrupt].u_int);
 
     if(!self->breakout->init()) {
-        mp_raise_msg(&mp_type_RuntimeError, "Encoder breakout not found when initialising");
+        mp_raise_msg(&mp_type_RuntimeError, "BreakoutEncoder: breakout not found when initialising");
     }
 
     return MP_OBJ_FROM_PTR(self);
diff --git a/micropython/modules/breakout_ioexpander/breakout_ioexpander.cpp b/micropython/modules/breakout_ioexpander/breakout_ioexpander.cpp
index 6ae34a67..d1d8d356 100644
--- a/micropython/modules/breakout_ioexpander/breakout_ioexpander.cpp
+++ b/micropython/modules/breakout_ioexpander/breakout_ioexpander.cpp
@@ -12,6 +12,13 @@ using namespace pimoroni;
 
 extern "C" {
 #include "breakout_ioexpander.h"
+#include "pimoroni_i2c.h"
+
+/***** I2C Struct *****/
+typedef struct _PimoroniI2C_obj_t {
+    mp_obj_base_t base;
+    I2C *i2c;
+} _PimoroniI2C_obj_t;
 
 /***** Variables Struct *****/
 typedef struct _breakout_ioexpander_BreakoutIOExpander_obj_t {
@@ -50,12 +57,10 @@ void BreakoutIOExpander_print(const mp_print_t *print, mp_obj_t self_in, mp_prin
 mp_obj_t BreakoutIOExpander_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
     breakout_ioexpander_BreakoutIOExpander_obj_t *self = nullptr;
 
-    enum { ARG_i2c, ARG_address, ARG_sda, ARG_scl, ARG_interrupt };
+    enum { ARG_i2c, ARG_address, ARG_interrupt };
     static const mp_arg_t allowed_args[] = {
-        { MP_QSTR_i2c, MP_ARG_INT, {.u_int = -1} },
+        { MP_QSTR_i2c, MP_ARG_OBJ, {.u_obj = nullptr} },
         { MP_QSTR_address, MP_ARG_INT, {.u_int = BreakoutIOExpander::DEFAULT_I2C_ADDRESS} },
-        { MP_QSTR_sda, MP_ARG_INT, {.u_int = I2C_DEFAULT_SDA} },
-        { MP_QSTR_scl, MP_ARG_INT, {.u_int = I2C_DEFAULT_SCL} },
         { MP_QSTR_interrupt, MP_ARG_INT, {.u_int = PIN_UNUSED} },
     };
 
@@ -64,32 +69,20 @@ mp_obj_t BreakoutIOExpander_make_new(const mp_obj_type_t *type, size_t n_args, s
     mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
     // Get I2C bus.
-    int i2c_id = args[ARG_i2c].u_int;
-    int sda = args[ARG_sda].u_int;
-    int scl = args[ARG_scl].u_int;
-
-    if(i2c_id == -1) {
-        i2c_id = (sda >> 1) & 0b1;  // If no i2c specified, choose the one for the given SDA pin
-    }
-    if(i2c_id < 0 || i2c_id > 1) {
-        mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("I2C(%d) doesn't exist"), i2c_id);
+    if(!MP_OBJ_IS_TYPE(args[ARG_i2c].u_obj, &PimoroniI2C_type)) {
+        mp_raise_ValueError(MP_ERROR_TEXT("BreakoutIOExpander: Bad i2C object"));
+        return mp_const_none;
     }
 
-    if(!IS_VALID_SDA(i2c_id, sda)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SDA pin"));
-    }
-
-    if(!IS_VALID_SCL(i2c_id, scl)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SCL pin"));
-    }
+    _PimoroniI2C_obj_t *i2c = (_PimoroniI2C_obj_t *)MP_OBJ_TO_PTR(args[ARG_i2c].u_obj);
 
     self = m_new_obj(breakout_ioexpander_BreakoutIOExpander_obj_t);
     self->base.type = &breakout_ioexpander_BreakoutIOExpander_type;
 
-    self->breakout = new BreakoutIOExpander(args[ARG_address].u_int, sda, scl, args[ARG_interrupt].u_int);
+    self->breakout = new BreakoutIOExpander(i2c->i2c, args[ARG_address].u_int, args[ARG_interrupt].u_int);
 
     if(!self->breakout->init()) {
-        mp_raise_msg(&mp_type_RuntimeError, "IOExpander breakout not found when initialising");
+        mp_raise_msg(&mp_type_RuntimeError, "BreakoutIOExpander: breakout not found when initialising");
     }
 
     return MP_OBJ_FROM_PTR(self);
diff --git a/micropython/modules/breakout_ltr559/breakout_ltr559.cpp b/micropython/modules/breakout_ltr559/breakout_ltr559.cpp
index 7d3661c4..735a5845 100644
--- a/micropython/modules/breakout_ltr559/breakout_ltr559.cpp
+++ b/micropython/modules/breakout_ltr559/breakout_ltr559.cpp
@@ -12,6 +12,13 @@ using namespace pimoroni;
 
 extern "C" {
 #include "breakout_ltr559.h"
+#include "pimoroni_i2c.h"
+
+/***** I2C Struct *****/
+typedef struct _PimoroniI2C_obj_t {
+    mp_obj_base_t base;
+    I2C *i2c;
+} _PimoroniI2C_obj_t;
 
 /***** Variables Struct *****/
 typedef struct _breakout_ltr559_BreakoutLTR559_obj_t {
@@ -50,45 +57,30 @@ void BreakoutLTR559_print(const mp_print_t *print, mp_obj_t self_in, mp_print_ki
 mp_obj_t BreakoutLTR559_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
     breakout_ltr559_BreakoutLTR559_obj_t *self = nullptr;
 
-    enum { ARG_i2c, ARG_sda, ARG_scl, ARG_interrupt };
+    enum { ARG_i2c, ARG_interrupt };
     static const mp_arg_t allowed_args[] = {
-        { MP_QSTR_i2c, MP_ARG_INT, {.u_int = -1} },
-        { MP_QSTR_sda, MP_ARG_INT, {.u_int = I2C_DEFAULT_SDA} },
-        { MP_QSTR_scl, MP_ARG_INT, {.u_int = I2C_DEFAULT_SCL} },
-        { MP_QSTR_interrupt, MP_ARG_INT, {.u_int = -1} },
+        { MP_QSTR_i2c, MP_ARG_OBJ, {.u_obj = nullptr} },
+        { MP_QSTR_interrupt, MP_ARG_INT, {.u_int = PIN_UNUSED} },
     };
 
     // Parse args.
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
     mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
-    // Get I2C bus.
-    int i2c_id = args[ARG_i2c].u_int;
-    int sda = args[ARG_sda].u_int;
-    int scl = args[ARG_scl].u_int;
-
-    if(i2c_id == -1) {
-        i2c_id = (sda >> 1) & 0b1;  // If no i2c specified, choose the one for the given SDA pin
-    }
-    if(i2c_id < 0 || i2c_id > 1) {
-        mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("I2C(%d) doesn't exist"), i2c_id);
+    if(!MP_OBJ_IS_TYPE(args[ARG_i2c].u_obj, &PimoroniI2C_type)) {
+        mp_raise_ValueError(MP_ERROR_TEXT("BreakoutLTR559: Bad i2C object"));
+        return mp_const_none;
     }
 
-    if(!IS_VALID_SDA(i2c_id, sda)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SDA pin"));
-    }
-
-    if(!IS_VALID_SCL(i2c_id, scl)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SCL pin"));
-    }
+    _PimoroniI2C_obj_t *i2c = (_PimoroniI2C_obj_t *)MP_OBJ_TO_PTR(args[ARG_i2c].u_obj);
 
     self = m_new_obj(breakout_ltr559_BreakoutLTR559_obj_t);
     self->base.type = &breakout_ltr559_BreakoutLTR559_type;
 
-    self->breakout = new BreakoutLTR559(sda, scl, args[ARG_interrupt].u_int);
+    self->breakout = new BreakoutLTR559(i2c->i2c, args[ARG_interrupt].u_int);
 
     if(!self->breakout->init()) {
-        mp_raise_msg(&mp_type_RuntimeError, "LTR559 breakout not found when initialising");
+        mp_raise_msg(&mp_type_RuntimeError, "BreakoutLTR559: breakout not found when initialising");
     }
 
     return MP_OBJ_FROM_PTR(self);
diff --git a/micropython/modules/breakout_matrix11x7/breakout_matrix11x7.cpp b/micropython/modules/breakout_matrix11x7/breakout_matrix11x7.cpp
index 5952fcdf..06d89c90 100644
--- a/micropython/modules/breakout_matrix11x7/breakout_matrix11x7.cpp
+++ b/micropython/modules/breakout_matrix11x7/breakout_matrix11x7.cpp
@@ -12,6 +12,13 @@ using namespace pimoroni;
 
 extern "C" {
 #include "breakout_matrix11x7.h"
+#include "pimoroni_i2c.h"
+
+/***** I2C Struct *****/
+typedef struct _PimoroniI2C_obj_t {
+    mp_obj_base_t base;
+    I2C *i2c;
+} _PimoroniI2C_obj_t;
 
 /***** Variables Struct *****/
 typedef struct _breakout_matrix11x7_BreakoutMatrix11x7_obj_t {
@@ -47,12 +54,10 @@ void BreakoutMatrix11x7_print(const mp_print_t *print, mp_obj_t self_in, mp_prin
 mp_obj_t BreakoutMatrix11x7_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
     breakout_matrix11x7_BreakoutMatrix11x7_obj_t *self = nullptr;
 
-    enum { ARG_i2c, ARG_address, ARG_sda, ARG_scl };
+    enum { ARG_i2c, ARG_address };
     static const mp_arg_t allowed_args[] = {
-        { MP_QSTR_i2c, MP_ARG_INT, {.u_int = -1} },
-        { MP_QSTR_address, MP_ARG_INT, {.u_int = BreakoutMatrix11x7::DEFAULT_I2C_ADDRESS} },
-        { MP_QSTR_sda, MP_ARG_INT, {.u_int = I2C_DEFAULT_SDA} },
-        { MP_QSTR_scl, MP_ARG_INT, {.u_int = I2C_DEFAULT_SCL} },
+        { MP_QSTR_i2c, MP_ARG_OBJ, {.u_obj = nullptr} },
+        { MP_QSTR_address, MP_ARG_INT, {.u_int = BreakoutMatrix11x7::DEFAULT_I2C_ADDRESS} }
     };
 
     // Parse args.
@@ -60,33 +65,20 @@ mp_obj_t BreakoutMatrix11x7_make_new(const mp_obj_type_t *type, size_t n_args, s
     mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
     // Get I2C bus.
-    int i2c_id = args[ARG_i2c].u_int;
-    int sda = args[ARG_sda].u_int;
-    int scl = args[ARG_scl].u_int;
-
-    if(i2c_id == -1) {
-        i2c_id = (sda >> 1) & 0b1;  // If no i2c specified, choose the one for the given SDA pin
-    }
-    if(i2c_id < 0 || i2c_id > 1) {
-        mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("I2C(%d) doesn't exist"), i2c_id);
+    if(!MP_OBJ_IS_TYPE(args[ARG_i2c].u_obj, &PimoroniI2C_type)) {
+        mp_raise_ValueError(MP_ERROR_TEXT("BreakoutMatrix11x7: Bad i2C object"));
+        return mp_const_none;
     }
 
-    if(!IS_VALID_SDA(i2c_id, sda)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SDA pin"));
-    }
-
-    if(!IS_VALID_SCL(i2c_id, scl)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SCL pin"));
-    }
+    _PimoroniI2C_obj_t *i2c = (_PimoroniI2C_obj_t *)MP_OBJ_TO_PTR(args[ARG_i2c].u_obj);
 
     self = m_new_obj(breakout_matrix11x7_BreakoutMatrix11x7_obj_t);
     self->base.type = &breakout_matrix11x7_BreakoutMatrix11x7_type;
 
-    i2c_inst_t *i2c = (i2c_id == 0) ? i2c0 : i2c1;
-    self->breakout = new BreakoutMatrix11x7(i2c, args[ARG_address].u_int, sda, scl);
+    self->breakout = new BreakoutMatrix11x7(i2c->i2c, args[ARG_address].u_int);
 
     if(!self->breakout->init()) {
-        mp_raise_msg(&mp_type_RuntimeError, "Matrix11x7 breakout not found when initialising");
+        mp_raise_msg(&mp_type_RuntimeError, "BreakoutMatrix11x7: breakout not found when initialising");
     }
 
     return MP_OBJ_FROM_PTR(self);
diff --git a/micropython/modules/breakout_mics6814/breakout_mics6814.cpp b/micropython/modules/breakout_mics6814/breakout_mics6814.cpp
index d8b47141..3994faac 100644
--- a/micropython/modules/breakout_mics6814/breakout_mics6814.cpp
+++ b/micropython/modules/breakout_mics6814/breakout_mics6814.cpp
@@ -12,6 +12,13 @@ using namespace pimoroni;
 
 extern "C" {
 #include "breakout_mics6814.h"
+#include "pimoroni_i2c.h"
+
+/***** I2C Struct *****/
+typedef struct _PimoroniI2C_obj_t {
+    mp_obj_base_t base;
+    I2C *i2c;
+} _PimoroniI2C_obj_t;
 
 /***** Variables Struct *****/
 typedef struct _breakout_mics6814_BreakoutMICS6814_obj_t {
@@ -50,12 +57,10 @@ void BreakoutMICS6814_print(const mp_print_t *print, mp_obj_t self_in, mp_print_
 mp_obj_t BreakoutMICS6814_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
     breakout_mics6814_BreakoutMICS6814_obj_t *self = nullptr;
 
-    enum { ARG_i2c, ARG_address, ARG_sda, ARG_scl, ARG_interrupt };
+    enum { ARG_i2c, ARG_address, ARG_interrupt };
         static const mp_arg_t allowed_args[] = {
-        { MP_QSTR_i2c, MP_ARG_INT, {.u_int = -1} },
+        { MP_QSTR_i2c, MP_ARG_OBJ, {.u_obj = nullptr} },
         { MP_QSTR_address, MP_ARG_INT, {.u_int = BreakoutMICS6814::DEFAULT_I2C_ADDRESS} },
-        { MP_QSTR_sda, MP_ARG_INT, {.u_int = I2C_DEFAULT_SDA} },
-        { MP_QSTR_scl, MP_ARG_INT, {.u_int = I2C_DEFAULT_SCL} },
         { MP_QSTR_interrupt, MP_ARG_INT, {.u_int = PIN_UNUSED} },
     };
 
@@ -64,32 +69,20 @@ mp_obj_t BreakoutMICS6814_make_new(const mp_obj_type_t *type, size_t n_args, siz
     mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
     // Get I2C bus.
-    int i2c_id = args[ARG_i2c].u_int;
-    int sda = args[ARG_sda].u_int;
-    int scl = args[ARG_scl].u_int;
-
-    if(i2c_id == -1) {
-        i2c_id = (sda >> 1) & 0b1;  // If no i2c specified, choose the one for the given SDA pin
-    }
-    if(i2c_id < 0 || i2c_id > 1) {
-        mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("I2C(%d) doesn't exist"), i2c_id);
+    if(!MP_OBJ_IS_TYPE(args[ARG_i2c].u_obj, &PimoroniI2C_type)) {
+        mp_raise_ValueError(MP_ERROR_TEXT("BreakoutMICS6814: Bad i2C object"));
+        return mp_const_none;
     }
 
-    if(!IS_VALID_SDA(i2c_id, sda)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SDA pin"));
-    }
-
-    if(!IS_VALID_SCL(i2c_id, scl)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SCL pin"));
-    }
+    _PimoroniI2C_obj_t *i2c = (_PimoroniI2C_obj_t *)MP_OBJ_TO_PTR(args[ARG_i2c].u_obj);
 
     self = m_new_obj(breakout_mics6814_BreakoutMICS6814_obj_t);
     self->base.type = &breakout_mics6814_BreakoutMICS6814_type;
 
-    self->breakout = new BreakoutMICS6814(args[ARG_address].u_int, sda, scl, args[ARG_interrupt].u_int);
+    self->breakout = new BreakoutMICS6814(i2c->i2c, args[ARG_address].u_int, args[ARG_interrupt].u_int);
 
     if(!self->breakout->init()) {
-        mp_raise_msg(&mp_type_RuntimeError, "MICS6814 breakout not found when initialising");
+        mp_raise_msg(&mp_type_RuntimeError, "BreakoutMICS6814: breakout not found when initialising");
     }
 
     return MP_OBJ_FROM_PTR(self);
diff --git a/micropython/modules/breakout_msa301/breakout_msa301.cpp b/micropython/modules/breakout_msa301/breakout_msa301.cpp
index bd1cea90..bb21fed3 100644
--- a/micropython/modules/breakout_msa301/breakout_msa301.cpp
+++ b/micropython/modules/breakout_msa301/breakout_msa301.cpp
@@ -11,6 +11,13 @@ using namespace pimoroni;
 
 extern "C" {
 #include "breakout_msa301.h"
+#include "pimoroni_i2c.h"
+
+/***** I2C Struct *****/
+typedef struct _PimoroniI2C_obj_t {
+    mp_obj_base_t base;
+    I2C *i2c;
+} _PimoroniI2C_obj_t;
 
 /***** Variables Struct *****/
 typedef struct _breakout_msa301_BreakoutMSA301_obj_t {
@@ -44,11 +51,9 @@ void BreakoutMSA301_print(const mp_print_t *print, mp_obj_t self_in, mp_print_ki
 mp_obj_t BreakoutMSA301_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
     breakout_msa301_BreakoutMSA301_obj_t *self = nullptr;
 
-    enum { ARG_i2c, ARG_sda, ARG_scl, ARG_interrupt };
+    enum { ARG_i2c, ARG_interrupt };
     static const mp_arg_t allowed_args[] = {
-        { MP_QSTR_i2c, MP_ARG_INT, {.u_int = -1} },
-        { MP_QSTR_sda, MP_ARG_INT, {.u_int = I2C_DEFAULT_SDA} },
-        { MP_QSTR_scl, MP_ARG_INT, {.u_int = I2C_DEFAULT_SCL} },
+        { MP_QSTR_i2c, MP_ARG_OBJ, {.u_obj = nullptr} },
         { MP_QSTR_interrupt, MP_ARG_INT, {.u_int = PIN_UNUSED} },
     };
 
@@ -56,34 +61,20 @@ mp_obj_t BreakoutMSA301_make_new(const mp_obj_type_t *type, size_t n_args, size_
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
     mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
-    // Get I2C bus.
-    int i2c_id = args[ARG_i2c].u_int;
-    int sda = args[ARG_sda].u_int;
-    int scl = args[ARG_scl].u_int;
-
-    if(i2c_id == -1) {
-        i2c_id = (sda >> 1) & 0b1;  // If no i2c specified, choose the one for the given SDA pin
-    }
-    if(i2c_id < 0 || i2c_id > 1) {
-        mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("I2C(%d) doesn't exist"), i2c_id);
+    if(!MP_OBJ_IS_TYPE(args[ARG_i2c].u_obj, &PimoroniI2C_type)) {
+        mp_raise_ValueError(MP_ERROR_TEXT("BreakoutMSA301: Bad i2C object"));
+        return mp_const_none;
     }
 
-    if(!IS_VALID_SDA(i2c_id, sda)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SDA pin"));
-    }
-
-    if(!IS_VALID_SCL(i2c_id, scl)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SCL pin"));
-    }
+    _PimoroniI2C_obj_t *i2c = (_PimoroniI2C_obj_t *)MP_OBJ_TO_PTR(args[ARG_i2c].u_obj);
 
     self = m_new_obj(breakout_msa301_BreakoutMSA301_obj_t);
     self->base.type = &breakout_msa301_BreakoutMSA301_type;
-    
-    i2c_inst_t *i2c = (i2c_id == 0) ? i2c0 : i2c1;
-    self->breakout = new BreakoutMSA301(i2c, sda, scl, args[ARG_interrupt].u_int);
+
+    self->breakout = new BreakoutMSA301(i2c->i2c, args[ARG_interrupt].u_int);
 
     if(!self->breakout->init()) {
-        mp_raise_msg(&mp_type_RuntimeError, "MSA301 breakout not found when initialising");
+        mp_raise_msg(&mp_type_RuntimeError, "BreakoutMSA301: breakout not found when initialising");
     }
 
     return MP_OBJ_FROM_PTR(self);
diff --git a/micropython/modules/breakout_potentiometer/breakout_potentiometer.cpp b/micropython/modules/breakout_potentiometer/breakout_potentiometer.cpp
index 05c2820e..90fc24d3 100644
--- a/micropython/modules/breakout_potentiometer/breakout_potentiometer.cpp
+++ b/micropython/modules/breakout_potentiometer/breakout_potentiometer.cpp
@@ -69,7 +69,7 @@ mp_obj_t BreakoutPotentiometer_make_new(const mp_obj_type_t *type, size_t n_args
     mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
     if(!MP_OBJ_IS_TYPE(args[ARG_i2c].u_obj, &PimoroniI2C_type)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad i2C object"));
+        mp_raise_ValueError(MP_ERROR_TEXT("BreakoutPotentiometer: Bad i2C object"));
         return mp_const_none;
     }
 
@@ -81,7 +81,7 @@ mp_obj_t BreakoutPotentiometer_make_new(const mp_obj_type_t *type, size_t n_args
     self->breakout = new BreakoutPotentiometer(i2c->i2c, args[ARG_interrupt].u_int);
 
     if(!self->breakout->init()) {
-        mp_raise_msg(&mp_type_RuntimeError, "Potentiometer breakout not found when initialising");
+        mp_raise_msg(&mp_type_RuntimeError, "BreakoutPotentiometer: breakout not found when initialising");
     }
 
     return MP_OBJ_FROM_PTR(self);
diff --git a/micropython/modules/breakout_rgbmatrix5x5/breakout_rgbmatrix5x5.cpp b/micropython/modules/breakout_rgbmatrix5x5/breakout_rgbmatrix5x5.cpp
index 3e4859a9..c1c80676 100644
--- a/micropython/modules/breakout_rgbmatrix5x5/breakout_rgbmatrix5x5.cpp
+++ b/micropython/modules/breakout_rgbmatrix5x5/breakout_rgbmatrix5x5.cpp
@@ -12,6 +12,13 @@ using namespace pimoroni;
 
 extern "C" {
 #include "breakout_rgbmatrix5x5.h"
+#include "pimoroni_i2c.h"
+
+/***** I2C Struct *****/
+typedef struct _PimoroniI2C_obj_t {
+    mp_obj_base_t base;
+    I2C *i2c;
+} _PimoroniI2C_obj_t;
 
 /***** Variables Struct *****/
 typedef struct _breakout_rgbmatrix5x5_BreakoutRGBMatrix5x5_obj_t {
@@ -47,12 +54,10 @@ void BreakoutRGBMatrix5x5_print(const mp_print_t *print, mp_obj_t self_in, mp_pr
 mp_obj_t BreakoutRGBMatrix5x5_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
     breakout_rgbmatrix5x5_BreakoutRGBMatrix5x5_obj_t *self = nullptr;
 
-    enum { ARG_i2c, ARG_address, ARG_sda, ARG_scl };
+    enum { ARG_i2c, ARG_address };
     static const mp_arg_t allowed_args[] = {
-        { MP_QSTR_i2c, MP_ARG_INT, {.u_int = -1} },
-        { MP_QSTR_address, MP_ARG_INT, {.u_int = BreakoutRGBMatrix5x5::DEFAULT_I2C_ADDRESS} },
-        { MP_QSTR_sda, MP_ARG_INT, {.u_int = I2C_DEFAULT_SDA} },
-        { MP_QSTR_scl, MP_ARG_INT, {.u_int = I2C_DEFAULT_SCL} },
+        { MP_QSTR_i2c, MP_ARG_OBJ, {.u_obj = nullptr} },
+        { MP_QSTR_address, MP_ARG_INT, {.u_int = BreakoutRGBMatrix5x5::DEFAULT_I2C_ADDRESS} }
     };
 
     // Parse args.
@@ -60,33 +65,20 @@ mp_obj_t BreakoutRGBMatrix5x5_make_new(const mp_obj_type_t *type, size_t n_args,
     mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
     // Get I2C bus.
-    int i2c_id = args[ARG_i2c].u_int;
-    int sda = args[ARG_sda].u_int;
-    int scl = args[ARG_scl].u_int;
-
-    if(i2c_id == -1) {
-        i2c_id = (sda >> 1) & 0b1;  // If no i2c specified, choose the one for the given SDA pin
-    }
-    if(i2c_id < 0 || i2c_id > 1) {
-        mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("I2C(%d) doesn't exist"), i2c_id);
+    if(!MP_OBJ_IS_TYPE(args[ARG_i2c].u_obj, &PimoroniI2C_type)) {
+        mp_raise_ValueError(MP_ERROR_TEXT("BreakoutRGBMatrix5x5: Bad i2C object"));
+        return mp_const_none;
     }
 
-    if(!IS_VALID_SDA(i2c_id, sda)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SDA pin"));
-    }
-
-    if(!IS_VALID_SCL(i2c_id, scl)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SCL pin"));
-    }
+    _PimoroniI2C_obj_t *i2c = (_PimoroniI2C_obj_t *)MP_OBJ_TO_PTR(args[ARG_i2c].u_obj);
 
     self = m_new_obj(breakout_rgbmatrix5x5_BreakoutRGBMatrix5x5_obj_t);
     self->base.type = &breakout_rgbmatrix5x5_BreakoutRGBMatrix5x5_type;
-    
-    i2c_inst_t *i2c = (i2c_id == 0) ? i2c0 : i2c1;
-    self->breakout = new BreakoutRGBMatrix5x5(i2c, args[ARG_address].u_int, sda, scl);
+
+    self->breakout = new BreakoutRGBMatrix5x5(i2c->i2c, args[ARG_address].u_int);
 
     if(!self->breakout->init()) {
-        mp_raise_msg(&mp_type_RuntimeError, "RGBMatrix5x5 breakout not found when initialising");
+        mp_raise_msg(&mp_type_RuntimeError, "BreakoutRGBMatrix5x5: breakout not found when initialising");
     }
 
     return MP_OBJ_FROM_PTR(self);
diff --git a/micropython/modules/breakout_rtc/breakout_rtc.cpp b/micropython/modules/breakout_rtc/breakout_rtc.cpp
index 7ab6793d..22afbf42 100644
--- a/micropython/modules/breakout_rtc/breakout_rtc.cpp
+++ b/micropython/modules/breakout_rtc/breakout_rtc.cpp
@@ -14,6 +14,13 @@ using namespace pimoroni;
 
 extern "C" {
 #include "breakout_rtc.h"
+#include "pimoroni_i2c.h"
+
+/***** I2C Struct *****/
+typedef struct _PimoroniI2C_obj_t {
+    mp_obj_base_t base;
+    I2C *i2c;
+} _PimoroniI2C_obj_t;
 
 /***** Variables Struct *****/
 typedef struct _breakout_rtc_BreakoutRTC_obj_t {
@@ -47,11 +54,9 @@ void BreakoutRTC_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_
 mp_obj_t BreakoutRTC_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
     breakout_rtc_BreakoutRTC_obj_t *self = nullptr;
 
-    enum { ARG_i2c, ARG_sda, ARG_scl, ARG_interrupt };
+    enum { ARG_i2c, ARG_interrupt };
     static const mp_arg_t allowed_args[] = {
-        { MP_QSTR_i2c, MP_ARG_INT, {.u_int = -1} },
-        { MP_QSTR_sda, MP_ARG_INT, {.u_int = I2C_DEFAULT_SDA} },
-        { MP_QSTR_scl, MP_ARG_INT, {.u_int = I2C_DEFAULT_SCL} },
+        { MP_QSTR_i2c, MP_ARG_OBJ, {.u_obj = nullptr} },
         { MP_QSTR_interrupt, MP_ARG_INT, {.u_int = PIN_UNUSED} },
     };
 
@@ -60,33 +65,20 @@ mp_obj_t BreakoutRTC_make_new(const mp_obj_type_t *type, size_t n_args, size_t n
     mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
     // Get I2C bus.
-    int i2c_id = args[ARG_i2c].u_int;
-    int sda = args[ARG_sda].u_int;
-    int scl = args[ARG_scl].u_int;
-
-    if(i2c_id == -1) {
-        i2c_id = (sda >> 1) & 0b1;  // If no i2c specified, choose the one for the given SDA pin
-    }
-    if(i2c_id < 0 || i2c_id > 1) {
-        mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("I2C(%d) doesn't exist"), i2c_id);
+    if(!MP_OBJ_IS_TYPE(args[ARG_i2c].u_obj, &PimoroniI2C_type)) {
+        mp_raise_ValueError(MP_ERROR_TEXT("BreakoutRTC: Bad i2C object"));
+        return mp_const_none;
     }
 
-    if(!IS_VALID_SDA(i2c_id, sda)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SDA pin"));
-    }
-
-    if(!IS_VALID_SCL(i2c_id, scl)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SCL pin"));
-    }
+    _PimoroniI2C_obj_t *i2c = (_PimoroniI2C_obj_t *)MP_OBJ_TO_PTR(args[ARG_i2c].u_obj);
 
     self = m_new_obj(breakout_rtc_BreakoutRTC_obj_t);
     self->base.type = &breakout_rtc_BreakoutRTC_type;
 
-    i2c_inst_t *i2c = (i2c_id == 0) ? i2c0 : i2c1;
-    self->breakout = new BreakoutRTC(i2c, sda, scl, args[ARG_interrupt].u_int);
+    self->breakout = new BreakoutRTC(i2c->i2c, args[ARG_interrupt].u_int);
 
     if(!self->breakout->init()) {
-        mp_raise_msg(&mp_type_RuntimeError, "RTC breakout not found when initialising");
+        mp_raise_msg(&mp_type_RuntimeError, "BreakoutRTC: breakout not found when initialising");
     }
 
     return MP_OBJ_FROM_PTR(self);
diff --git a/micropython/modules/breakout_sgp30/breakout_sgp30.cpp b/micropython/modules/breakout_sgp30/breakout_sgp30.cpp
index 10c6a42d..41ff3029 100644
--- a/micropython/modules/breakout_sgp30/breakout_sgp30.cpp
+++ b/micropython/modules/breakout_sgp30/breakout_sgp30.cpp
@@ -11,6 +11,13 @@ using namespace pimoroni;
 
 extern "C" {
 #include "breakout_sgp30.h"
+#include "pimoroni_i2c.h"
+
+/***** I2C Struct *****/
+typedef struct _PimoroniI2C_obj_t {
+    mp_obj_base_t base;
+    I2C *i2c;
+} _PimoroniI2C_obj_t;
 
 /***** Variables Struct *****/
 typedef struct _breakout_sgp30_BreakoutSGP30_obj_t {
@@ -41,11 +48,9 @@ void BreakoutSGP30_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kin
 mp_obj_t BreakoutSGP30_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
     breakout_sgp30_BreakoutSGP30_obj_t *self = nullptr;
 
-    enum { ARG_i2c, ARG_sda, ARG_scl };
+    enum { ARG_i2c };
     static const mp_arg_t allowed_args[] = {
-        { MP_QSTR_i2c, MP_ARG_INT, {.u_int = -1} },
-        { MP_QSTR_sda, MP_ARG_INT, {.u_int = I2C_DEFAULT_SDA} },
-        { MP_QSTR_scl, MP_ARG_INT, {.u_int = I2C_DEFAULT_SCL} },
+        { MP_QSTR_i2c, MP_ARG_OBJ, {.u_obj = nullptr} }
     };
 
     // Parse args.
@@ -53,33 +58,20 @@ mp_obj_t BreakoutSGP30_make_new(const mp_obj_type_t *type, size_t n_args, size_t
     mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
     // Get I2C bus.
-    int i2c_id = args[ARG_i2c].u_int;
-    int sda = args[ARG_sda].u_int;
-    int scl = args[ARG_scl].u_int;
-
-    if(i2c_id == -1) {
-        i2c_id = (sda >> 1) & 0b1;  // If no i2c specified, choose the one for the given SDA pin
-    }
-    if(i2c_id < 0 || i2c_id > 1) {
-        mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("I2C(%d) doesn't exist"), i2c_id);
+    if(!MP_OBJ_IS_TYPE(args[ARG_i2c].u_obj, &PimoroniI2C_type)) {
+        mp_raise_ValueError(MP_ERROR_TEXT("BreakoutSGP30: Bad i2C object"));
+        return mp_const_none;
     }
 
-    if(!IS_VALID_SDA(i2c_id, sda)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SDA pin"));
-    }
-
-    if(!IS_VALID_SCL(i2c_id, scl)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SCL pin"));
-    }
+    _PimoroniI2C_obj_t *i2c = (_PimoroniI2C_obj_t *)MP_OBJ_TO_PTR(args[ARG_i2c].u_obj);
 
     self = m_new_obj(breakout_sgp30_BreakoutSGP30_obj_t);
     self->base.type = &breakout_sgp30_BreakoutSGP30_type;
-    
-    i2c_inst_t *i2c = (i2c_id == 0) ? i2c0 : i2c1;
-    self->breakout = new BreakoutSGP30(i2c, sda, scl);
+
+    self->breakout = new BreakoutSGP30(i2c->i2c);
 
     if(!self->breakout->init()) {
-        mp_raise_msg(&mp_type_RuntimeError, "SGP30 breakout not found when initialising");
+        mp_raise_msg(&mp_type_RuntimeError, "BreakoutSGP30: breakout not found when initialising");
     }
 
     return MP_OBJ_FROM_PTR(self);
diff --git a/micropython/modules/breakout_trackball/breakout_trackball.cpp b/micropython/modules/breakout_trackball/breakout_trackball.cpp
index 660c9630..eb62513e 100644
--- a/micropython/modules/breakout_trackball/breakout_trackball.cpp
+++ b/micropython/modules/breakout_trackball/breakout_trackball.cpp
@@ -12,6 +12,13 @@ using namespace pimoroni;
 
 extern "C" {
 #include "breakout_trackball.h"
+#include "pimoroni_i2c.h"
+
+/***** I2C Struct *****/
+typedef struct _PimoroniI2C_obj_t {
+    mp_obj_base_t base;
+    I2C *i2c;
+} _PimoroniI2C_obj_t;
 
 /***** Variables Struct *****/
 typedef struct _breakout_trackball_BreakoutTrackball_obj_t {
@@ -50,12 +57,10 @@ void BreakoutTrackball_print(const mp_print_t *print, mp_obj_t self_in, mp_print
 mp_obj_t BreakoutTrackball_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
     breakout_trackball_BreakoutTrackball_obj_t *self = nullptr;
 
-    enum { ARG_i2c, ARG_address, ARG_sda, ARG_scl, ARG_interrupt };
+    enum { ARG_i2c, ARG_address, ARG_interrupt };
     static const mp_arg_t allowed_args[] = {
-        { MP_QSTR_i2c, MP_ARG_INT, {.u_int = -1} },
+        { MP_QSTR_i2c, MP_ARG_OBJ, {.u_obj = nullptr} },
         { MP_QSTR_address, MP_ARG_INT, {.u_int = BreakoutTrackball::DEFAULT_I2C_ADDRESS} },
-        { MP_QSTR_sda, MP_ARG_INT, {.u_int = I2C_DEFAULT_SDA} },
-        { MP_QSTR_scl, MP_ARG_INT, {.u_int = I2C_DEFAULT_SCL} },
         { MP_QSTR_interrupt, MP_ARG_INT, {.u_int = PIN_UNUSED} },
     };
 
@@ -64,30 +69,17 @@ mp_obj_t BreakoutTrackball_make_new(const mp_obj_type_t *type, size_t n_args, si
     mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
     // Get I2C bus.
-    int i2c_id = args[ARG_i2c].u_int;
-    int sda = args[ARG_sda].u_int;
-    int scl = args[ARG_scl].u_int;
-
-    if(i2c_id == -1) {
-        i2c_id = (sda >> 1) & 0b1;  // If no i2c specified, choose the one for the given SDA pin
-    }
-    if(i2c_id < 0 || i2c_id > 1) {
-        mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("I2C(%d) doesn't exist"), i2c_id);
+    if(!MP_OBJ_IS_TYPE(args[ARG_i2c].u_obj, &PimoroniI2C_type)) {
+        mp_raise_ValueError(MP_ERROR_TEXT("BreakoutSGP30: Bad i2C object"));
+        return mp_const_none;
     }
 
-    if(!IS_VALID_SDA(i2c_id, sda)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SDA pin"));
-    }
-
-    if(!IS_VALID_SCL(i2c_id, scl)) {
-        mp_raise_ValueError(MP_ERROR_TEXT("bad SCL pin"));
-    }
+    _PimoroniI2C_obj_t *i2c = (_PimoroniI2C_obj_t *)MP_OBJ_TO_PTR(args[ARG_i2c].u_obj);
 
     self = m_new_obj(breakout_trackball_BreakoutTrackball_obj_t);
     self->base.type = &breakout_trackball_BreakoutTrackball_type;
 
-    i2c_inst_t *i2c = (i2c_id == 0) ? i2c0 : i2c1;
-    self->breakout = new BreakoutTrackball(i2c, args[ARG_address].u_int, sda, scl, args[ARG_interrupt].u_int);
+    self->breakout = new BreakoutTrackball(i2c->i2c, args[ARG_address].u_int, args[ARG_interrupt].u_int);
 
     if(!self->breakout->init()) {
         mp_raise_msg(&mp_type_RuntimeError, "Trackball breakout not found when initialising");
diff --git a/micropython/modules/pimoroni_i2c/pimoroni_i2c.cpp b/micropython/modules/pimoroni_i2c/pimoroni_i2c.cpp
index 1d0c2dee..f8924fd2 100644
--- a/micropython/modules/pimoroni_i2c/pimoroni_i2c.cpp
+++ b/micropython/modules/pimoroni_i2c/pimoroni_i2c.cpp
@@ -50,10 +50,11 @@ mp_obj_t PimoroniI2C___del__(mp_obj_t self_in) {
 mp_obj_t PimoroniI2C_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
     _PimoroniI2C_obj_t *self = nullptr;
 
-    enum { ARG_sda, ARG_scl };
+    enum { ARG_sda, ARG_scl, ARG_baudrate };
     static const mp_arg_t allowed_args[] = {
         { MP_QSTR_sda, MP_ARG_INT, {.u_int = I2C_DEFAULT_SDA} },
         { MP_QSTR_scl, MP_ARG_INT, {.u_int = I2C_DEFAULT_SCL} },
+        { MP_QSTR_baudrate, MP_ARG_INT, {.u_int = I2C_DEFAULT_BAUDRATE} },
     };
 
     // Parse args.
@@ -63,6 +64,7 @@ mp_obj_t PimoroniI2C_make_new(const mp_obj_type_t *type, size_t n_args, size_t n
     // Get I2C bus.
     int sda = args[ARG_sda].u_int;
     int scl = args[ARG_scl].u_int;
+    int baud = args[ARG_baudrate].u_int;
     int i2c_id = (sda >> 1) & 0b1;  // i2c bus for given SDA pin
 
     if(!IS_VALID_SDA(i2c_id, sda)) {
@@ -76,7 +78,7 @@ mp_obj_t PimoroniI2C_make_new(const mp_obj_type_t *type, size_t n_args, size_t n
     self = m_new_obj_with_finaliser(_PimoroniI2C_obj_t);
     self->base.type = &PimoroniI2C_type;
 
-    self->i2c = new I2C(sda, scl);
+    self->i2c = new I2C(sda, scl, baud);
 
     return MP_OBJ_FROM_PTR(self);
 }