[Domotique] récupérer la température et la pression atmosphérique avec un Raspberry

#!/usr/bin/python
# --------------------------------------
#    ___    ___    _ ____
#     / _ \/ _ \(_) __/__    __ __
#    / , _/ ___/ /\ \/ _ \/ // /
# /_/|_/_/    /_/___/ .__/\_, /
#    /_/     /___/
#
#    bme280.py
#    Read data from a digital pressure sensor.
#
#    Official datasheet available from :
#    https://www.bosch-sensortec.com/bst/products/all_products/bme280
#
# Author : Matt Hawkins
# Date     : 25/07/2016
#
# http://www.raspberrypi-spy.co.uk/
# https://bitbucket.org/MattHawkinsUK/rpispy-misc/raw/master/python/bme280.py
# --------------------------------------

import smbus
import time
from ctypes import c_short

# Default device I2C address
DEVICE = 0x76


# Rev 2 Pi, Pi 0, Pi 2 & Pi 3 uses bus 1
# Rev 1 Pi uses bus 0
bus = smbus.SMBus(1)


def getShort(data, index):
    # return two bytes from data as a signed 16-bit value
    return c_short((data[index + 1] << 8) + data[index]).value


def getUShort(data, index):
    # return two bytes from data as an unsigned 16-bit value
    return (data[index + 1] << 8) + data[index]


def getChar(data, index):
    # return one byte from data as a signed char
    result = data[index]
    if result > 127:
        result -= 256
    return result


def getUChar(data, index):
    # return one byte from data as an unsigned char
    result = data[index] & 0xFF
    return result


def readBME280ID(addr=DEVICE):
    # Chip ID Register Address
    REG_ID = 0xD0
    (chip_id, chip_version) = bus.read_i2c_block_data(addr, REG_ID, 2)
    return (chip_id, chip_version)


def readBME280All(addr=DEVICE):
    # Register Addresses
    REG_DATA = 0xF7
    REG_CONTROL = 0xF4
    REG_CONTROL_HUM = 0xF2

    # Oversample setting - page 27
    OVERSAMPLE_TEMP = 2
    OVERSAMPLE_PRES = 2
    MODE = 1

    # Oversample setting for humidity register - page 26
    OVERSAMPLE_HUM = 2
    bus.write_byte_data(addr, REG_CONTROL_HUM, OVERSAMPLE_HUM)

    control = OVERSAMPLE_TEMP << 5 | OVERSAMPLE_PRES << 2 | MODE
    bus.write_byte_data(addr, REG_CONTROL, control)

    # Read blocks of calibration data from EEPROM
    # See Page 22 data sheet
    cal1 = bus.read_i2c_block_data(addr, 0x88, 24)
    cal2 = bus.read_i2c_block_data(addr, 0xA1, 1)
    cal3 = bus.read_i2c_block_data(addr, 0xE1, 7)

    # Convert byte data to word values
    dig_T1 = getUShort(cal1, 0)
    dig_T2 = getShort(cal1, 2)
    dig_T3 = getShort(cal1, 4)

    dig_P1 = getUShort(cal1, 6)
    dig_P2 = getShort(cal1, 8)
    dig_P3 = getShort(cal1, 10)
    dig_P4 = getShort(cal1, 12)
    dig_P5 = getShort(cal1, 14)
    dig_P6 = getShort(cal1, 16)
    dig_P7 = getShort(cal1, 18)
    dig_P8 = getShort(cal1, 20)
    dig_P9 = getShort(cal1, 22)

    dig_H1 = getUChar(cal2, 0)
    dig_H2 = getShort(cal3, 0)
    dig_H3 = getUChar(cal3, 2)

    dig_H4 = getChar(cal3, 3)
    dig_H4 = (dig_H4 << 24) >> 20
    dig_H4 = dig_H4 | (getChar(cal3, 4) & 0x0F)

    dig_H5 = getChar(cal3, 5)
    dig_H5 = (dig_H5 << 24) >> 20
    dig_H5 = dig_H5 | (getUChar(cal3, 4) >> 4 & 0x0F)

    dig_H6 = getChar(cal3, 6)

    # Wait in ms (Datasheet Appendix B:
    # Measurement time and current calculation)
    wait_time = 1.25 + (2.3 * OVERSAMPLE_TEMP) +\
        ((2.3 * OVERSAMPLE_PRES) + 0.575) + ((2.3 * OVERSAMPLE_HUM) + 0.575)
    # Wait the required time
    time.sleep(wait_time / 1000)

    # Read temperature/pressure/humidity
    data = bus.read_i2c_block_data(addr, REG_DATA, 8)
    pres_raw = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4)
    temp_raw = (data[3] << 12) | (data[4] << 4) | (data[5] >> 4)
    hum_raw = (data[6] << 8) | data[7]

    # Refine temperature
    var1 = ((((temp_raw >> 3) - (dig_T1 << 1))) * (dig_T2)) >> 11
    var2 = (((((temp_raw >> 4) - (dig_T1)) *
              ((temp_raw >> 4) - (dig_T1))) >> 12) * (dig_T3)) >> 14
    t_fine = var1 + var2
    temperature = float(((t_fine * 5) + 128) >> 8)

    # Refine pressure and adjust for temperature
    var1 = t_fine / 2.0 - 64000.0
    var2 = var1 * var1 * dig_P6 / 32768.0
    var2 = var2 + var1 * dig_P5 * 2.0
    var2 = var2 / 4.0 + dig_P4 * 65536.0
    var1 = (dig_P3 * var1 * var1 / 524288.0 + dig_P2 * var1) / 524288.0
    var1 = (1.0 + var1 / 32768.0) * dig_P1
    if var1 == 0:
        pressure = 0
    else:
        pressure = 1048576.0 - pres_raw
        pressure = ((pressure - var2 / 4096.0) * 6250.0) / var1
        var1 = dig_P9 * pressure * pressure / 2147483648.0
        var2 = pressure * dig_P8 / 32768.0
        pressure = pressure + (var1 + var2 + dig_P7) / 16.0

    # Refine humidity
    humidity = t_fine - 76800.0
    humidity = (hum_raw - (dig_H4 * 64.0 + dig_H5 / 16384.0 * humidity))\
        * (dig_H2 / 65536.0 * (1.0 + dig_H6 / 67108864.0 * humidity *
                               (1.0 + dig_H3 / 67108864.0 * humidity)))
    humidity = humidity * (1.0 - dig_H1 * humidity / 524288.0)
    if humidity > 100:
        humidity = 100
    elif humidity < 0:
        humidity = 0

    return temperature / 100.0, pressure / 100.0, humidity


def main():
    temperature, pressure, humidity = readBME280All()
    weather = [temperature, pressure, humidity]
    return weather


if __name__ == "__main__":
    (chip_id, chip_version) = readBME280ID()
    print("Chip ID :", chip_id)
    print("Version :", chip_version)

    temperature, pressure, humidity = readBME280All()
    print("Temperature : ", temperature, "C")
    print("Pressure : ", pressure, "hPa")
    print("Humidity : ", humidity, "%")

~/bme $ python bme.py 
('Chip ID :', 96)
('Version :', 0)
('Temperature : ', 20.34, 'C')
('Pressure : ', 1002.2085705444156, 'hPa')
('Humidity : ', 60.38054404621201, '%')

#!/usr/bin/python

from bme import main
from requests.auth import HTTPBasicAuth
import requests
import sys


# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# fonctions
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

def maj_widget(val_url):
    requete = 'http://' + domoticz_ip + ':' + domoticz_port + val_url
    # print requete
    r = requests.get(requete, auth=HTTPBasicAuth(user, password))
    if r.status_code != 200:
        print("Erreur API Domoticz")


# 0=Normal
# 1=Comfortable
# 2=Dry
# 3=Wet
def humidity_status(val):
    if 0 <= val <= 75:
        humidity_status = 0
    elif 76 <= val <= 79:
        humidity_status = 1
    elif 80 <= val <= 94:
        humidity_status = 2
    elif 95 <= val <= 100:
        humidity_status = 3
    return humidity_status


# 0 = No info
# 1 = Sunny
# 2 = Partly cloudy
# 3 = Cloudy
# 4 = Rain
def barometer_forecast(val):
    if val < 1006:
        weather = 4
    elif 1007 <= val <= 1013:
        weather = 3
    elif 1014 <= val <= 1020:
        weather = 2
    elif val > 1020:
        weather = 1
    else:
        weather = 0
    return weather


# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# les parametres de Domoticz
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

domoticz_ip = ''
domoticz_port = '8080'
user = ''
password = ''
domoticz_idx = ''

# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# recuperation des informations des capteurs
# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

value = main()

temperature = int(value[0])
pressure = int(value[1])
humidity = int(value[2])

hum_stat = humidity_status(humidity)
bar_for = barometer_forecast(int(pressure))

if humidity is not None and temperature is not None and pressure is not None:

    # https://www.domoticz.com/wiki/Domoticz_API/JSON_URL%27s#Temperature.2Fhumidity.2Fbarometer
    # modele url : /json.htm?type=command&param=udevice&idx=IDX&nvalue=0&
    # svalue=TEMP;HUM;HUM_STAT;BAR;BAR_FOR
    # l URL Domoticz pour le widget virtuel

    url = '/json.htm?type=command&param=udevice&idx=' + str(domoticz_idx)
    url += '&nvalue=0&svalue='
    url += str('{0:0.1f};{1:0.1f};{2:0};{3:0.1f};{4:0}').format(temperature, humidity, hum_stat, pressure, bar_for)
    print(url)
    maj_widget(url)

else:
    print('Probleme avec la lecture du BME280')
    sys.exit(1)