102 lines
3.9 KiB
Python
102 lines
3.9 KiB
Python
"""Station météo connectée vers MQTT via wifi
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"""
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import esp
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import bme280_i2c
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import adafruit_max31865
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from ntptime import settime
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from main_lib import *
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import config
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# Connect to WLAN
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wlan = WifiConnect(config.WIFI_SSID, config.WIFI_PSK)
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# Create a micropython I2C object with the appropriate device pins
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i2c = machine.I2C(scl=machine.Pin(5), sda=machine.Pin(4))
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# Create a sensor object to represent the BME280
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# Note that this will error if the device can't be reached over I2C.
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bme = bme280_i2c.BME280_I2C(address=bme280_i2c.BME280_I2C_ADDR_SEC, i2c=i2c)
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# Configure the sensor for the application in question.
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bme.set_measurement_settings({
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'filter': bme280_i2c.BME280_FILTER_COEFF_16,
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'standby_time': bme280_i2c.BME280_STANDBY_TIME_500_US,
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'osr_h': bme280_i2c.BME280_OVERSAMPLING_1X,
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'osr_p': bme280_i2c.BME280_OVERSAMPLING_16X,
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'osr_t': bme280_i2c.BME280_OVERSAMPLING_2X})
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# Start the sensor automatically sensing
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bme.set_power_mode(bme280_i2c.BME280_NORMAL_MODE)
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# Conversion coeff. between measured pressure and Seau Mean-level pressure
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# Source: https://fr.wikipedia.org/wiki/Pression-altitude
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SMLP_coef=pow(1.0-((0.0065*config.ALTITUDE)/288.15), 5.255)
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# PT100 (via max81865 module) sensor setup
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spi=machine.SPI(-1, sck=machine.Pin(14, machine.Pin.OUT), mosi=machine.Pin(13, machine.Pin.OUT), miso=machine.Pin(12, machine.Pin.OUT))
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spi.init(baudrate=115200, polarity=0, phase=1) #, firstbit=machine.SPI.MSB)
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max31865_cs=machine.Pin(2)
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max31865=adafruit_max31865.MAX31865(spi, max31865_cs)
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# RTC setup
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rtc=machine.RTC()
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settime()
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client = MQTTClient(client_id=config.CLIENT_ID,
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server=config.MQTT_HOST,
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user=config.MQTT_USERNAME,
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password=config.MQTT_PASSWD,
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port=config.MQTT_PORT)
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client.connect()
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MqttPublish(client, "last_boot", now(rtc))
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MqttPublish(client, "location", config.LOCATION, retain=True, qos=1)
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MqttPublish(client, "humidity/unit", "%", retain=True)
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MqttPublish(client, "humidity/desc", "Capteur Bosch BME280", retain=True, qos=0)
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MqttPublish(client, "pressure/unit", "hPa", retain=True, qos=0)
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MqttPublish(client, "pressure/desc", "Capteur Bosch BME280", retain=True, qos=0)
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MqttPublish(client, "pressure2/unit", "hPa", retain=True, qos=0)
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MqttPublish(client, "pressure2/desc", "Capteur Bosch BME280 revenu au niveau de la mer", retain=True, qos=0)
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MqttPublish(client, "temperature/unit", "degC", retain=True, qos=0)
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MqttPublish(client, "temperature/desc", "Capteur Bosch BME280", retain=True, qos=0)
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MqttPublish(client, "temperature2/unit", "degC", retain=True, qos=0)
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MqttPublish(client, "temperature2/desc", "Sonde PT100/MAX31865", retain=True, qos=0)
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MqttPublish(client, "wifi/ssid", config.WIFI_SSID, retain=True, qos=0)
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MqttPublish(client, "wifi/ip", wlan.ifconfig()[0], retain=True, qos=0)
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MqttPublish(client, "sys/esp8266_device_id", "{:d}".format(esp.flash_id()), retain=True, qos=0)
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time.sleep_ms(1000)
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# For each nature, a list describes:
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# - mqtt topic
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# - string format
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# - factor (multiplier)
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# - qos
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topics = {"time" : ["time/last_values", "{}", 1, 1],
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"humidity" : ["humidity/value", "{:.0f}", 1, 1],
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"pressure" : ["pressure/value", "{:.2f}", 0.01, 1],
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"pressure2" : ["pressure2/value", "{:.2f}", 0.01, 1],
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"temperature" : ["temperature/value", "{:.1f}", 1, 1],
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"temperature2" : ["temperature/value2", "{:.1f}", 1, 1],
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"wifi_rssi" : ["wifi/rssi", "{:.0f}", 1, 1],
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}
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while 1:
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bme_data = bme.get_measurement()
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bme_data['time'] = now(rtc)
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bme_data['pressure2'] = bme_data['pressure']/SMLP_coef
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bme_data['temperature2'] = max31865.temperature
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bme_data['wifi_rssi'] = wlan.status('rssi')
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print(bme_data)
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for nature, param in topics.items():
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MqttPublish(client,
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param[0],
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param[1].format(bme_data[nature]*param[2]),
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qos=param[3],
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sleep=20)
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time.sleep(config.REFRESH_RATE)
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