ble_temperature.py

# Esta obra está licenciada bajo la licencia MIT.
# Copyright (c) 2013-2023 OpenMV LLC. Todos los derechos reservados.
# https://github.com/openmv/openmv/blob/master/LICENSE
#
# Ejemplo de sensor de temperatura BLE.

import time
from hts221 import HTS221
from board import LED
from machine import Pin, I2C
from ubluepy import Service, Characteristic, UUID, Peripheral, constants


def event_handler(id, handle, data):
    global periph, service, notif_enabled

    if id == constants.EVT_GAP_CONNECTED:
        # indica 'connected'
        LED(1).on()
    elif id == constants.EVT_GAP_DISCONNECTED:
        # indica 'disconnected'
        LED(1).off()
        # reiniciar el advertising
        periph.advertise(device_name="Temperature Sensor", services=[service])
    elif id == constants.EVT_GATTS_WRITE:
        # la escritura en esta característica es al CCCD
        if int(data[0]) == 1:
            notif_enabled = True
        else:
            notif_enabled = False


# empezar con LED(1) apagado
LED(1).off()

notif_enabled = False
uuid_service = UUID("0x181A")  # Servicio de detección ambiental
uuid_temp = UUID("0x2A6E")  # Característica de temperatura

service = Service(uuid_service)
temp_props = Characteristic.PROP_READ | Characteristic.PROP_NOTIFY
temp_attrs = Characteristic.ATTR_CCCD
temp_char = Characteristic(uuid_temp, props=temp_props, attrs=temp_attrs)
service.addCharacteristic(temp_char)

periph = Peripheral()
periph.addService(service)
periph.setConnectionHandler(event_handler)
periph.advertise(device_name="Temperature Sensor", services=[service])

bus = I2C(1, scl=Pin(15), sda=Pin(14))
try:
    hts = HTS221(bus)
except OSError:
    from hs3003 import HS3003

    hts = HS3003(bus)

while True:
    if notif_enabled:
        temp = int(hts.temperature() * 100)
        temp_char.write(bytearray([temp & 0xFF, temp >> 8]))
    time.sleep_ms(100)