add spoooky mooon example

micropython/examples/plasma_stick/moon.py

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+import time
+import plasma
+from plasma import plasma2040
+from machine import RTC
+
+"""
+Spooky moon simulator!
+The LEDs will get brighter as midnight approaches!
+It won't do much in the day...
+Needs to be run from Thonny to get the right time.
+"""
+
+# Set how many LEDs you have
+NUM_LEDS = 50
+
+# pick a hue (0 - 360° on the colour wheel)
+# warm white moon - 60, blue moon - 230 , blood moon - 0
+HUE = 60
+SATURATION = 0.2  # increase this for a more colourful moon (max 1.0)
+
+# when to start counting down from, in seconds before midnight
+# eg from 10pm = 2 hours = 2 * 60 * 60 = 7200
+COUNT_FROM = 14400
+
+# set up the WS2812 / NeoPixel™ LEDs
+led_strip = plasma.WS2812(NUM_LEDS, 0, 0, plasma2040.DAT)
+
+# start updating the LED strip
+led_strip.start()
+
+while True:
+    # get the time from Pico RTC
+    year, month, day, _, hour, minute, second, _ = RTC().datetime()
+    print(f'Time is {hour:02d}:{minute:02d}')
+
+    # calculate how long to go until midnight
+    if hour >= 12:
+        hours_to_go = 23 - hour
+        minutes_to_go = 59 - minute
+        seconds_to_go = 59 - second
+        total_seconds = hours_to_go * 60 * 60 + minutes_to_go * 60 + seconds_to_go
+        print(f'{total_seconds} seconds until midnight')
+    # or, if it's after midnight
+    else:
+        hours_since = 0 + hour
+        minutes_since = 0 + minute
+        seconds_since = 0 + second
+        total_seconds = hours_since * 60 * 60 + minutes_since * 60 + seconds_since
+        print(f'{total_seconds} seconds since midnight')
+
+    # gets brighter as witching hour approacheth
+    brightness = max(0, (COUNT_FROM - total_seconds) / COUNT_FROM)
+    for i in range(NUM_LEDS):
+        led_strip.set_hsv(i, HUE/365.0, SATURATION, brightness)
+    print(f'Brightness - {brightness * 100} %')
+    time.sleep(10.0)

micropython/examples/plasma_stick/moon_rtc.py

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+import time
+import plasma
+from plasma import plasma2040
+from machine import RTC
+
+"""
+Spooky moon simulator!
+The LEDs will get brighter as midnight approaches!
+It won't do much in the day...
+Gets the time from a connected RV3028 RTC breakout:
+https://shop.pimoroni.com/products/rv3028-real-time-clock-rtc-breakout
+"""
+
+# Set how many LEDs you have
+NUM_LEDS = 50
+
+# pick a hue (0 - 360° on the colour wheel)
+# warm white moon - 60, blue moon - 230 , blood moon - 0
+HUE = 60
+SATURATION = 0.2  # increase this for a more colourful moon (max 1.0)
+
+# when to start counting down from, in seconds before midnight
+# eg from 10pm = 2 hours = 2 * 60 * 60 = 7200
+COUNT_FROM = 14400
+
+
+def set_pico_time():
+    # the function sets the Pico's RTC from a RV3028 RTC breakout
+    # to setup breakout (and set the time) run this first:
+    # https://github.com/pimoroni/pimoroni-pico/blob/main/micropython/examples/breakout_rtc/set-time.py
+    from pimoroni_i2c import PimoroniI2C
+    from breakout_rtc import BreakoutRTC
+    from machine import RTC
+
+    # set up I2C
+    PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}  # i2c pins 4, 5 for Breakout Garden
+    i2c = PimoroniI2C(**PINS_BREAKOUT_GARDEN)
+
+    # set up the RTC breakout
+    RV3028 = BreakoutRTC(i2c)
+
+    # set the Pico's RTC from the RTC breakout
+    RV3028.update_time()
+    RTC().datetime([RV3028.get_year(), RV3028.get_month(), RV3028.get_date(),
+                    RV3028.get_weekday(), RV3028.get_hours(), RV3028.get_minutes(),
+                    RV3028.get_seconds(), 0])
+    print(f"Pico RTC set to breakout time: {RV3028.string_date()} {RV3028.string_time()}")
+
+
+# set up the WS2812 / NeoPixel™ LEDs
+led_strip = plasma.WS2812(NUM_LEDS, 0, 0, plasma2040.DAT)
+
+# start updating the LED strip
+led_strip.start()
+
+# call our function to set the Pico's RTC
+set_pico_time()
+
+while True:
+    # get the time from Pico RTC
+    year, month, day, _, hour, minute, second, _ = RTC().datetime()
+    print(f'Time is {hour:02d}:{minute:02d}')
+
+    # calculate how long to go until midnight
+    if hour >= 12:
+        hours_to_go = 23 - hour
+        minutes_to_go = 59 - minute
+        seconds_to_go = 59 - second
+        total_seconds = hours_to_go * 60 * 60 + minutes_to_go * 60 + seconds_to_go
+        print(f'{total_seconds} seconds until midnight')
+    # or, if it's after midnight
+    else:
+        hours_since = 0 + hour
+        minutes_since = 0 + minute
+        seconds_since = 0 + second
+        total_seconds = hours_since * 60 * 60 + minutes_since * 60 + seconds_since
+        print(f'{total_seconds} seconds since midnight')
+
+    # gets brighter as witching hour approacheth
+    brightness = max(0, (COUNT_FROM - total_seconds) / COUNT_FROM)
+    for i in range(NUM_LEDS):
+        led_strip.set_hsv(i, HUE/365.0, SATURATION, brightness)
+    print(f'Brightness - {brightness * 100} %')
+    time.sleep(10.0)