kopia lustrzana https://github.com/micropython/micropython
104 wiersze
3.4 KiB
Python
104 wiersze
3.4 KiB
Python
# This example demonstrates a simple temperature sensor peripheral.
|
|
#
|
|
# The sensor's local value updates every second, and it will notify
|
|
# any connected central every 10 seconds.
|
|
|
|
# This example demonstrates the low-level bluetooth module. For most
|
|
# applications, we recommend using the higher-level aioble library which takes
|
|
# care of all IRQ handling and connection management. See
|
|
# https://github.com/micropython/micropython-lib/tree/master/micropython/bluetooth/aioble
|
|
# and in particular the temp_sensor.py example included with aioble.
|
|
|
|
import bluetooth
|
|
import random
|
|
import struct
|
|
import time
|
|
from ble_advertising import advertising_payload
|
|
|
|
from micropython import const
|
|
|
|
_IRQ_CENTRAL_CONNECT = const(1)
|
|
_IRQ_CENTRAL_DISCONNECT = const(2)
|
|
_IRQ_GATTS_INDICATE_DONE = const(20)
|
|
|
|
_FLAG_READ = const(0x0002)
|
|
_FLAG_NOTIFY = const(0x0010)
|
|
_FLAG_INDICATE = const(0x0020)
|
|
|
|
# org.bluetooth.service.environmental_sensing
|
|
_ENV_SENSE_UUID = bluetooth.UUID(0x181A)
|
|
# org.bluetooth.characteristic.temperature
|
|
_TEMP_CHAR = (
|
|
bluetooth.UUID(0x2A6E),
|
|
_FLAG_READ | _FLAG_NOTIFY | _FLAG_INDICATE,
|
|
)
|
|
_ENV_SENSE_SERVICE = (
|
|
_ENV_SENSE_UUID,
|
|
(_TEMP_CHAR,),
|
|
)
|
|
|
|
# org.bluetooth.characteristic.gap.appearance.xml
|
|
_ADV_APPEARANCE_GENERIC_THERMOMETER = const(768)
|
|
|
|
|
|
class BLETemperature:
|
|
def __init__(self, ble, name="mpy-temp"):
|
|
self._ble = ble
|
|
self._ble.active(True)
|
|
self._ble.irq(self._irq)
|
|
((self._handle,),) = self._ble.gatts_register_services((_ENV_SENSE_SERVICE,))
|
|
self._connections = set()
|
|
self._payload = advertising_payload(
|
|
name=name, services=[_ENV_SENSE_UUID], appearance=_ADV_APPEARANCE_GENERIC_THERMOMETER
|
|
)
|
|
self._advertise()
|
|
|
|
def _irq(self, event, data):
|
|
# Track connections so we can send notifications.
|
|
if event == _IRQ_CENTRAL_CONNECT:
|
|
conn_handle, _, _ = data
|
|
self._connections.add(conn_handle)
|
|
elif event == _IRQ_CENTRAL_DISCONNECT:
|
|
conn_handle, _, _ = data
|
|
self._connections.remove(conn_handle)
|
|
# Start advertising again to allow a new connection.
|
|
self._advertise()
|
|
elif event == _IRQ_GATTS_INDICATE_DONE:
|
|
conn_handle, value_handle, status = data
|
|
|
|
def set_temperature(self, temp_deg_c, notify=False, indicate=False):
|
|
# Data is sint16 in degrees Celsius with a resolution of 0.01 degrees Celsius.
|
|
# Write the local value, ready for a central to read.
|
|
self._ble.gatts_write(self._handle, struct.pack("<h", int(temp_deg_c * 100)))
|
|
if notify or indicate:
|
|
for conn_handle in self._connections:
|
|
if notify:
|
|
# Notify connected centrals.
|
|
self._ble.gatts_notify(conn_handle, self._handle)
|
|
if indicate:
|
|
# Indicate connected centrals.
|
|
self._ble.gatts_indicate(conn_handle, self._handle)
|
|
|
|
def _advertise(self, interval_us=500000):
|
|
self._ble.gap_advertise(interval_us, adv_data=self._payload)
|
|
|
|
|
|
def demo():
|
|
ble = bluetooth.BLE()
|
|
temp = BLETemperature(ble)
|
|
|
|
t = 25
|
|
i = 0
|
|
|
|
while True:
|
|
# Write every second, notify every 10 seconds.
|
|
i = (i + 1) % 10
|
|
temp.set_temperature(t, notify=i == 0, indicate=False)
|
|
# Random walk the temperature.
|
|
t += random.uniform(-0.5, 0.5)
|
|
time.sleep_ms(1000)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
demo()
|