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Init commit : send data from bme280 to adafruit IO

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Pierrick C 2019-06-30 20:57:20 +02:00
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config.py

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# Author(s): Jonathan Hanson 2018
#
# This is more or less a straight read of the Bosch data sheet at:
# https://www.bosch-sensortec.com/bst/products/all_products/bme280
# and specifically:
# https://ae-bst.resource.bosch.com/media/_tech/media/datasheets/BST-BME280_DS001-12.pdf
#
# Modeled on the reference library Bosch Sensortec C library at:
# https://github.com/BoschSensortec/BME280_driver
#
# The development of this module was heavily guided by the prior work done
# by Peter Dahlberg et al at:
# https://github.com/catdog2/mpy_bme280_esp8266
from micropython import const
from ustruct import unpack, unpack_from
from utime import sleep_ms
# BME280 default address
BME280_I2C_ADDR_PRIM = const(0x76)
BME280_I2C_ADDR_SEC = const(0x77)
# Sensor Power Mode Options
BME280_SLEEP_MODE = const(0x00)
BME280_FORCED_MODE = const(0x01)
BME280_NORMAL_MODE = const(0x03)
# Oversampling Options
BME280_NO_OVERSAMPLING = const(0x00)
BME280_OVERSAMPLING_1X = const(0x01)
BME280_OVERSAMPLING_2X = const(0x02)
BME280_OVERSAMPLING_4X = const(0x03)
BME280_OVERSAMPLING_8X = const(0x04)
BME280_OVERSAMPLING_16X = const(0x05)
# Standby Duration Options
BME280_STANDBY_TIME_500_US = const(0x00) # Note this is microseconds, so 0.5 ms
BME280_STANDBY_TIME_62_5_MS = const(0x01)
BME280_STANDBY_TIME_125_MS = const(0x02)
BME280_STANDBY_TIME_250_MS = const(0x03)
BME280_STANDBY_TIME_500_MS = const(0x04)
BME280_STANDBY_TIME_1000_MS = const(0x05)
BME280_STANDBY_TIME_10_MS = const(0x06)
BME280_STANDBY_TIME_20_MS = const(0x07)
# Filter Coefficient Options
BME280_FILTER_COEFF_OFF = const(0x00)
BME280_FILTER_COEFF_2 = const(0x01)
BME280_FILTER_COEFF_4 = const(0x02)
BME280_FILTER_COEFF_8 = const(0x03)
BME280_FILTER_COEFF_16 = const(0x04)
# BME280 Chip ID
_BME280_CHIP_ID = const(0x60)
# Register Addresses
_BME280_CHIP_ID_ADDR = const(0xD0)
_BME280_RESET_ADDR = const(0xE0)
_BME280_TEMP_PRESS_CALIB_DATA_ADDR = const(0x88)
_BME280_HUMIDITY_CALIB_DATA_ADDR = const(0xE1)
_BME280_PWR_CTRL_ADDR = const(0xF4)
_BME280_CTRL_HUM_ADDR = const(0xF2)
_BME280_CTRL_MEAS_ADDR = const(0xF4)
_BME280_CONFIG_ADDR = const(0xF5)
_BME280_DATA_ADDR = const(0xF7)
# Register range sizes
_BME280_TEMP_PRESS_CALIB_DATA_LEN = const(26)
_BME280_HUMIDITY_CALIB_DATA_LEN = const(7)
_BME280_P_T_H_DATA_LEN = const(8)
class BME280_I2C:
def __init__(self, address: int = BME280_I2C_ADDR_PRIM, i2c=None):
"""
Ensure I2C communication with the sensor is working, reset the sensor,
and load its calibration data into memory.
"""
self.address = address
if i2c is None:
raise ValueError('A configured I2C object is required.')
self.i2c = i2c
self._read_chip_id()
self._soft_reset()
self._load_calibration_data()
def _read_chip_id(self):
"""
Read the chip ID from the sensor and verify it's correct.
If the value isn't correct, wait 1ms and try again.
If 5 tries don't work, raise an exception.
"""
for x in range(5):
mem = self.i2c.readfrom_mem(self.address, _BME280_CHIP_ID_ADDR, 1)
if mem[0] == _BME280_CHIP_ID:
return
sleep_ms(1)
raise Exception("Couldn't read BME280 chip ID after 5 attempts.")
def _soft_reset(self):
"""
Write the reset command to the sensor's reset address.
Wait 2ms, per the reference library's example.
"""
self.i2c.writeto_mem(self.address, _BME280_RESET_ADDR, bytearray([0xB6]))
sleep_ms(2)
def _load_calibration_data(self):
"""
Load the read-only calibration values out of the sensor's memory, to be
used later in calibrating the raw reads. These get stored in various
self.cal_dig_* object properties.
See https://github.com/BoschSensortec/BME280_driver/blob/bme280_v3.3.4/bme280.c#L1192
See https://github.com/BoschSensortec/BME280_driver/blob/bme280_v3.3.4/bme280.c#L1216
See https://github.com/catdog2/mpy_bme280_esp8266/blob/master/bme280.py#L73
"""
# Load the temperature and pressure calibration data
# (note that the first value of the humidity data is stuffed in here)
tp_cal_mem = self.i2c.readfrom_mem(self.address,
_BME280_TEMP_PRESS_CALIB_DATA_ADDR,
_BME280_TEMP_PRESS_CALIB_DATA_LEN)
(self.cal_dig_T1, self.cal_dig_T2, self.cal_dig_T3,
self.cal_dig_P1, self.cal_dig_P2, self.cal_dig_P3,
self.cal_dig_P4, self.cal_dig_P5, self.cal_dig_P6,
self.cal_dig_P7, self.cal_dig_P8, self.cal_dig_P9,
_,
self.cal_dig_H1) = unpack("<HhhHhhhhhhhhBB", tp_cal_mem)
# Load the rest of the humidity calibration data
hum_cal_mem = self.i2c.readfrom_mem(self.address,
_BME280_HUMIDITY_CALIB_DATA_ADDR,
_BME280_HUMIDITY_CALIB_DATA_LEN)
self.cal_dig_H2, self.cal_dig_H3 = unpack("<hB", hum_cal_mem)
e4_sign = unpack_from("<b", hum_cal_mem, 3)[0]
self.cal_dig_H4 = (e4_sign << 4) | (hum_cal_mem[4] & 0b00001111)
e6_sign = unpack_from("<b", hum_cal_mem, 5)[0]
self.cal_dig_H5 = (e6_sign << 4) | (hum_cal_mem[4] >> 4)
self.cal_dig_H6 = unpack_from("<b", hum_cal_mem, 6)[0]
# Initialize the cal_t_fine carry-over value used during compensation
self.cal_t_fine = 0
def get_measurement_settings(self):
"""
Return a parsed set of the sensor's measurement settings as a dict
These values include oversampling settings for each measurement,
the IIR filter coefficient, and the standby duration for normal
power mode.
See the data sheet, section 3 and 5
"""
mem = self.i2c.readfrom_mem(self.address, _BME280_CTRL_HUM_ADDR, 4)
ctrl_hum, _, ctrl_meas, config = unpack("<BBBB", mem)
return {
"osr_h": (ctrl_hum & 0b00000111),
"osr_p": (ctrl_meas >> 2) & 0b00000111,
"osr_t": (ctrl_meas >> 5) & 0b00000111,
"filter": (config >> 2) & 0b00000111,
"standby_time": (config >> 5) & 0b00000111,
}
def set_measurement_settings(self, settings: dict):
"""
Set the sensor's settings for each measurement's oversampling,
the pressure IIR filter coefficient, and standby duration
during normal power mode.
The settings dict can have keys osr_h, osr_p, osr_t, filter, and
standby_time. All values are optional, and omitting any will retain
the pre-existing value.
See the data sheet, section 3 and 5
"""
self._validate_settings(settings)
self._ensure_sensor_is_asleep()
self._write_measurement_settings(settings)
def _validate_settings(self, settings: dict):
oversampling_options = [
BME280_NO_OVERSAMPLING, BME280_OVERSAMPLING_1X,
BME280_OVERSAMPLING_2X, BME280_OVERSAMPLING_4X,
BME280_OVERSAMPLING_8X, BME280_OVERSAMPLING_16X]
filter_options = [
BME280_FILTER_COEFF_OFF, BME280_FILTER_COEFF_2,
BME280_FILTER_COEFF_4, BME280_FILTER_COEFF_8,
BME280_FILTER_COEFF_16]
standby_time_options = [
BME280_STANDBY_TIME_500_US,
BME280_STANDBY_TIME_62_5_MS, BME280_STANDBY_TIME_125_MS,
BME280_STANDBY_TIME_250_MS, BME280_STANDBY_TIME_500_MS,
BME280_STANDBY_TIME_1000_MS, BME280_STANDBY_TIME_10_MS,
BME280_STANDBY_TIME_20_MS]
if 'osr_h' in settings:
if settings['osr_h'] not in oversampling_options:
raise ValueError("osr_h must be one of the oversampling defines")
if 'osr_p' in settings:
if settings['osr_h'] not in oversampling_options:
raise ValueError("osr_p must be one of the oversampling defines")
if 'osr_t' in settings:
if settings['osr_h'] not in oversampling_options:
raise ValueError("osr_t must be one of the oversampling defines")
if 'filter' in settings:
if settings['filter'] not in filter_options:
raise ValueError("filter filter coefficient defines")
if 'standby_time' in settings:
if settings['standby_time'] not in standby_time_options:
raise ValueError("standby_time must be one of the standby time duration defines")
def _write_measurement_settings(self, settings: dict):
# Read in the existing configuration, to modify
mem = self.i2c.readfrom_mem(self.address, _BME280_CTRL_HUM_ADDR, 4)
ctrl_hum, _, ctrl_meas, config = unpack("<BBBB", mem)
# Make any changes necessary to the ctrl_hum register
if "osr_h" in settings:
newval = (ctrl_hum & 0b11111000) | (settings['osr_h'] & 0b00000111)
self.i2c.writeto_mem(self.address, _BME280_CTRL_HUM_ADDR, bytearray([newval]))
# according to the data sheet, ctrl_hum needs a write to
# ctrl_meas in order to take effect
self.i2c.writeto_mem(self.address, _BME280_CTRL_MEAS_ADDR, bytearray([ctrl_meas]))
# Make any changes necessary to the ctrl_meas register
if "osr_p" in settings or "osr_t" in settings:
newval = ctrl_meas
if "osr_p" in settings:
newval = (newval & 0b11100011) | ((settings['osr_p'] << 2) & 0b00011100)
if "osr_t" in settings:
newval = (newval & 0b00011111) | ((settings['osr_t'] << 5) & 0b11100000)
self.i2c.writeto_mem(self.address, _BME280_CTRL_MEAS_ADDR, bytearray([newval]))
# Make any changes necessary to the config register
if "filter" in settings or "standby_time" in settings:
newval = config
if "filter" in settings:
newval = (newval & 0b11100011) | ((settings['filter'] << 2) & 0b00011100)
if "standby_time" in settings:
newval = (newval & 0b00011111) | ((settings['standby_time'] << 5) & 0b11100000)
self.i2c.writeto_mem(self.address, _BME280_CONFIG_ADDR, bytearray([newval]))
def get_power_mode(self):
"""
Result will be one of BME280_SLEEP_MODE, BME280_FORCED_MODE, or
BME280_NORMAL_MODE.
See the data sheet, section 3.3
"""
mem = self.i2c.readfrom_mem(self.address, _BME280_PWR_CTRL_ADDR, 1)
return (mem[0] & 0b00000011)
def set_power_mode(self, new_power_mode: int):
"""
Configure the sensor's power mode (BME280_SLEEP_MODE,
BME280_FORCED_MODE, or BME280_NORMAL_MODE)
Note that setting to forced mode will immediately set the sensor back
to sleep mode after taking a measurement.
See the data sheet, section 3.3
"""
if new_power_mode not in [BME280_SLEEP_MODE, BME280_FORCED_MODE, BME280_NORMAL_MODE]:
raise ValueError("New power mode must be sleep, forced, or normal constant")
self._ensure_sensor_is_asleep()
# Read the current register, mask out and set the new power mode,
# and write the register back to the device.
mem = self.i2c.readfrom_mem(self.address, _BME280_PWR_CTRL_ADDR, 1)
newval = (mem[0] & 0b11111100) | (new_power_mode & 0b00000011)
self.i2c.writeto_mem(self.address, _BME280_PWR_CTRL_ADDR, bytearray([newval]))
def _ensure_sensor_is_asleep(self):
"""
If the sensor mode isn't already "sleep", then put it to sleep.
This is done by reading out the configuration values we want to keep,
and then doing a soft reset and writing those values back.
"""
if self.get_power_mode() != BME280_SLEEP_MODE:
settings = self.get_measurement_settings()
self._soft_reset()
self._write_measurement_settings(settings)
def get_measurement(self):
"""
Return a set of measurements in decimal value, compensated with the
sensor's stored calibration data.
"""
uncompensated_data = self._read_uncompensated_data()
# Be sure to call self._compensate_temperature() first, as it sets a
# global "fine" calibration value for the other two compensation
# functions
return {
"temperature": self._compensate_temperature(uncompensated_data['temperature']),
"pressure": self._compensate_pressure(uncompensated_data['pressure']),
"humidity": self._compensate_humidity(uncompensated_data['humidity']),
}
def _read_uncompensated_data(self):
# Read the uncompensated temperature, pressure, and humidity data
mem = self.i2c.readfrom_mem(self.address, _BME280_DATA_ADDR, _BME280_P_T_H_DATA_LEN)
(press_msb, press_lsb, press_xlsb,
temp_msb, temp_lsb, temp_xlsb,
hum_msb, hum_lsb) = unpack("<BBBBBBBB", mem)
# Assemble the values from the memory fragments and return a dict.
#
# Note that we're calling temperature first, since it sets the
# cal_t_fine value used in humidity and pressure.
return {
"temperature": (temp_msb << 12) | (temp_lsb << 4) | (temp_xlsb >> 4),
"pressure": (press_msb << 12) | (press_lsb << 4) | (press_xlsb >> 4),
"humidity": (hum_msb << 8) | (hum_lsb),
}
##
# Float Implementations
##
# def _compensate_temperature(self, adc_T: int) -> float:
# """
# Output value of “25.0” equals 25.0 DegC.
#
# See the floating-point implementation in the reference library:
# https://github.com/BoschSensortec/BME280_driver/blob/bme280_v3.3.4/bme280.c#L884
# """
# temperature_min = -40
# temperature_max = 85
#
# var1 = (adc_T / 16384.0) - (self.cal_dig_T1 / 1024.0)
# var1 = var1 * self.cal_dig_T2
#
# var2 = (adc_T / 131072.0) - (self.cal_dig_T1 / 8192.0)
# var2 = var2 * var2 * self.cal_dig_T3
#
# self.cal_t_fine = int(var1 + var2)
#
# temperature = (var1 + var2) / 5120.0
#
# if temperature < temperature_min:
# temperature = temperature_min
# elif temperature > temperature_max:
# temperature = temperature_max
#
# return temperature
# def _compensate_pressure(self, adc_P: int) -> float:
# """
# Output value of “96386.0” equals 96386 Pa = 963.86 hPa
#
# See the floating-point implementation in the reference library:
# https://github.com/BoschSensortec/BME280_driver/blob/bme280_v3.3.4/bme280.c#L912
# """
# pressure_min = 30000.0
# pressure_max = 110000.0
#
# var1 = (self.cal_t_fine / 2.0) - 64000.0
#
# var2 = var1 * var1 * self.cal_dig_P6 / 32768.0
# var2 = var2 + (var1 * self.cal_dig_P5 * 2.0)
# var2 = (var2 / 4.0) + (self.cal_dig_P4 * 65536.0)
#
# var3 = self.cal_dig_P3 * var1 * var1 / 524288.0
#
# var1 = (var3 + self.cal_dig_P2 * var1) / 524288.0
# var1 = (1.0 + var1 / 32768.0) * self.cal_dig_P1
#
# # avoid exception caused by division by zero
# if var1:
# pressure = 1048576.0 - adc_P
# pressure = (pressure - (var2 / 4096.0)) * 6250.0 / var1
# var1 = self.cal_dig_P9 * pressure * pressure / 2147483648.0
# var2 = pressure * self.cal_dig_P8 / 32768.0
# pressure = pressure + (var1 + var2 + self.cal_dig_P7) / 16.0
#
# if pressure < pressure_min:
# pressure = pressure_min
# elif pressure > pressure_max:
# pressure = pressure_max
#
# else:
# # Invalid case
# pressure = pressure_min
#
# return pressure
# def _compensate_humidity(self, adc_H: int) -> float:
# """
# Output value between 0.0 and 100.0, where 100.0 is 100%RH
#
# See the floating-point implementation in the reference library:
# https://github.com/BoschSensortec/BME280_driver/blob/bme280_v3.3.4/bme280.c#L952
# """
# humidity_min = 0.0
# humidity_max = 100.0
#
# var1 = self.cal_t_fine - 76800.0
#
# var2 = self.cal_dig_H4 * 64.0 + (self.cal_dig_H5 / 16384.0) * var1
#
# var3 = adc_H - var2
#
# var4 = self.cal_dig_H2 / 65536.0
#
# var5 = 1.0 + (self.cal_dig_H3 / 67108864.0) * var1
#
# var6 = 1.0 + (self.cal_dig_H6 / 67108864.0) * var1 * var5
# var6 = var3 * var4 * (var5 * var6)
#
# humidity = var6 * (1.0 - self.cal_dig_H1 * var6 / 524288.0)
#
# if humidity > humidity_max:
# humidity = humidity_max
# elif humidity < humidity_min:
# humidity = humidity_min
#
# return humidity
##
# 32-Bit Integer Implementations
##
def _compensate_temperature(self, adc_T: int) -> float:
"""
Output value of “25.0” equals 25.0 DegC.
See the integer implementation in the data sheet, section 4.2.3
And the reference library:
https://github.com/BoschSensortec/BME280_driver/blob/bme280_v3.3.4/bme280.c#L987
"""
temperature_min = -4000
temperature_max = 8500
var1 = (((adc_T // 8) - (self.cal_dig_T1 * 2)) * self.cal_dig_T2) // 2048
var2 = (((((adc_T // 16) - self.cal_dig_T1) * ((adc_T // 16) - self.cal_dig_T1)) // 4096) * self.cal_dig_T3) // 16384
self.cal_t_fine = var1 + var2
temperature = (self.cal_t_fine * 5 + 128) // 256
if temperature < temperature_min:
temperature = temperature_min
elif temperature > temperature_max:
temperature = temperature_max
return temperature / 100
def _compensate_pressure(self, adc_P: int) -> float:
"""
Output value of “96386.0” equals 96386 Pa = 963.86 hPa
See the 32-bit integer implementation in the data sheet, section 4.2.3
And the reference library:
https://github.com/BoschSensortec/BME280_driver/blob/bme280_v3.3.4/bme280.c#L1059
Note that there's a 64-bit version of this function in the reference
library on line 1016 that we're leaving unimplemented.
"""
pressure_min = 30000
pressure_max = 110000
var1 = (self.cal_t_fine // 2) - 64000
var2 = (((var1 // 4) * (var1 // 4)) // 2048) * self.cal_dig_P6
var2 = var2 + ((var1 * self.cal_dig_P5) * 2)
var2 = (var2 // 4) + (self.cal_dig_P4 * 65536)
var3 = (self.cal_dig_P3 * (((var1 // 4) * (var1 // 4)) // 8192)) // 8
var4 = (self.cal_dig_P2 * var1) // 2
var1 = (var3 + var4) // 262144
var1 = ((32768 + var1) * self.cal_dig_P1) // 32768
# avoid exception caused by division by zero
if var1:
var5 = 1048576 - adc_P
pressure = (var5 - (var2 // 4096)) * 3125
if pressure < 0x80000000:
pressure = (pressure << 1) // var1
else:
pressure = (pressure // var1) * 2
var1 = (self.cal_dig_P9 * (((pressure // 8) * (pressure // 8)) // 8192)) // 4096
var2 = (((pressure // 4)) * self.cal_dig_P8) // 8192
pressure = pressure + ((var1 + var2 + self.cal_dig_P7) // 16)
if pressure < pressure_min:
pressure = pressure_min
elif pressure > pressure_max:
pressure = pressure_max
else:
# Invalid case
pressure = pressure_min
return pressure
def _compensate_humidity(self, adc_H: int) -> float:
"""
Output value between 0.0 and 100.0, where 100.0 is 100%RH
See the floating-point implementation in the reference library:
https://github.com/BoschSensortec/BME280_driver/blob/bme280_v3.3.4/bme280.c#1108
"""
humidity_max = 102400
var1 = self.cal_t_fine - 76800
var2 = adc_H * 16384
var3 = self.cal_dig_H4 * 1048576
var4 = self.cal_dig_H5 * var1
var5 = (((var2 - var3) - var4) + 16384) // 32768
var2 = (var1 * self.cal_dig_H6) // 1024
var3 = (var1 * self.cal_dig_H3) // 2048
var4 = ((var2 * (var3 + 32768)) // 1024) + 2097152
var2 = ((var4 * self.cal_dig_H2) + 8192) // 16384
var3 = var5 * var2
var4 = ((var3 // 32768) * (var3 // 32768)) // 128
var5 = var3 - ((var4 * self.cal_dig_H1) // 16)
if var5 < 0:
var5 = 0
if var5 > 419430400:
var5 = 419430400
humidity = var5 // 4096
if (humidity > humidity_max):
humidity = humidity_max
return humidity / 1024

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# Copyright (c) 2019, Pycom Limited.
#
# This software is licensed under the GNU GPL version 3 or any
# later version, with permitted additional terms. For more information
# see the Pycom Licence v1.0 document supplied with this file, or
# available at https://www.pycom.io/opensource/licensing
#
import usocket as socket
import ustruct as struct
from ubinascii import hexlify
class MQTTException(Exception):
pass
class MQTTClient:
def __init__(self, client_id, server, port=0, user=None, password=None, keepalive=0,
ssl=False, ssl_params={}):
if port == 0:
port = 8883 if ssl else 1883
self.client_id = client_id
self.sock = None
self.addr = socket.getaddrinfo(server, port)[0][-1]
self.ssl = ssl
self.ssl_params = ssl_params
self.pid = 0
self.cb = None
self.user = user
self.pswd = password
self.keepalive = keepalive
self.lw_topic = None
self.lw_msg = None
self.lw_qos = 0
self.lw_retain = False
def _send_str(self, s):
self.sock.write(struct.pack("!H", len(s)))
self.sock.write(s)
def _recv_len(self):
n = 0
sh = 0
while 1:
b = self.sock.read(1)[0]
n |= (b & 0x7f) << sh
if not b & 0x80:
return n
sh += 7
def set_callback(self, f):
self.cb = f
def set_last_will(self, topic, msg, retain=False, qos=0):
assert 0 <= qos <= 2
assert topic
self.lw_topic = topic
self.lw_msg = msg
self.lw_qos = qos
self.lw_retain = retain
def connect(self, clean_session=True):
self.sock = socket.socket()
self.sock.connect(self.addr)
if self.ssl:
import ussl
self.sock = ussl.wrap_socket(self.sock, **self.ssl_params)
msg = bytearray(b"\x10\0\0\x04MQTT\x04\x02\0\0")
msg[1] = 10 + 2 + len(self.client_id)
msg[9] = clean_session << 1
if self.user is not None:
msg[1] += 2 + len(self.user) + 2 + len(self.pswd)
msg[9] |= 0xC0
if self.keepalive:
assert self.keepalive < 65536
msg[10] |= self.keepalive >> 8
msg[11] |= self.keepalive & 0x00FF
if self.lw_topic:
msg[1] += 2 + len(self.lw_topic) + 2 + len(self.lw_msg)
msg[9] |= 0x4 | (self.lw_qos & 0x1) << 3 | (self.lw_qos & 0x2) << 3
msg[9] |= self.lw_retain << 5
self.sock.write(msg)
#print(hex(len(msg)), hexlify(msg, ":"))
self._send_str(self.client_id)
if self.lw_topic:
self._send_str(self.lw_topic)
self._send_str(self.lw_msg)
if self.user is not None:
self._send_str(self.user)
self._send_str(self.pswd)
resp = self.sock.read(4)
assert resp[0] == 0x20 and resp[1] == 0x02
if resp[3] != 0:
raise MQTTException(resp[3])
return resp[2] & 1
def disconnect(self):
self.sock.write(b"\xe0\0")
self.sock.close()
def ping(self):
self.sock.write(b"\xc0\0")
def publish(self, topic, msg, retain=False, qos=0):
pkt = bytearray(b"\x30\0\0\0")
pkt[0] |= qos << 1 | retain
sz = 2 + len(topic) + len(msg)
if qos > 0:
sz += 2
assert sz < 2097152
i = 1
while sz > 0x7f:
pkt[i] = (sz & 0x7f) | 0x80
sz >>= 7
i += 1
pkt[i] = sz
#print(hex(len(pkt)), hexlify(pkt, ":"))
self.sock.write(pkt, i + 1)
self._send_str(topic)
if qos > 0:
self.pid += 1
pid = self.pid
struct.pack_into("!H", pkt, 0, pid)
self.sock.write(pkt, 2)
self.sock.write(msg)
if qos == 1:
while 1:
op = self.wait_msg()
if op == 0x40:
sz = self.sock.read(1)
assert sz == b"\x02"
rcv_pid = self.sock.read(2)
rcv_pid = rcv_pid[0] << 8 | rcv_pid[1]
if pid == rcv_pid:
return
elif qos == 2:
assert 0
def subscribe(self, topic, qos=0):
assert self.cb is not None, "Subscribe callback is not set"
pkt = bytearray(b"\x82\0\0\0")
self.pid += 1
struct.pack_into("!BH", pkt, 1, 2 + 2 + len(topic) + 1, self.pid)
#print(hex(len(pkt)), hexlify(pkt, ":"))
self.sock.write(pkt)
self._send_str(topic)
self.sock.write(qos.to_bytes(1, "little"))
while 1:
op = self.wait_msg()
if op == 0x90:
resp = self.sock.read(4)
#print(resp)
assert resp[1] == pkt[2] and resp[2] == pkt[3]
if resp[3] == 0x80:
raise MQTTException(resp[3])
return
# Wait for a single incoming MQTT message and process it.
# Subscribed messages are delivered to a callback previously
# set by .set_callback() method. Other (internal) MQTT
# messages processed internally.
def wait_msg(self):
res = self.sock.read(1)
self.sock.setblocking(True)
if res is None:
return None
if res == b"":
raise OSError(-1)
if res == b"\xd0": # PINGRESP
sz = self.sock.read(1)[0]
assert sz == 0
return None
op = res[0]
if op & 0xf0 != 0x30:
return op
sz = self._recv_len()
topic_len = self.sock.read(2)
topic_len = (topic_len[0] << 8) | topic_len[1]
topic = self.sock.read(topic_len)
sz -= topic_len + 2
if op & 6:
pid = self.sock.read(2)
pid = pid[0] << 8 | pid[1]
sz -= 2
msg = self.sock.read(sz)
self.cb(topic, msg)
if op & 6 == 2:
pkt = bytearray(b"\x40\x02\0\0")
struct.pack_into("!H", pkt, 2, pid)
self.sock.write(pkt)
elif op & 6 == 4:
assert 0
# Checks whether a pending message from server is available.
# If not, returns immediately with None. Otherwise, does
# the same processing as wait_msg.
def check_msg(self):
self.sock.setblocking(False)
return self.wait_msg()

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code/main.py Normal file
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"""Station météo connectée au service Adafruit IO
"""
import time
import machine
import network
import bme280_i2c
from mqtt import MQTTClient
import config
# connect to WLAN
wlan = network.WLAN(network.STA_IF)
nets = wlan.scan()
for net in nets:
net_ssid = net[0].decode()
if net_ssid == config.WIFI_SSID:
print('Network found!')
wlan.connect(net_ssid, config.WIFI_PSK)
while not wlan.isconnected():
machine.idle() # save power while waiting
print('WLAN connection succeeded!')
break
if not wlan.isconnected():
print("WLAN not found/not connected")
# Create a micropython I2C object with the appropriate device pins
i2c = machine.I2C(scl=machine.Pin(5), sda=machine.Pin(4))
# Create a sensor object to represent the BME280
# Note that this will error if the device can't be reached over I2C.
bme = bme280_i2c.BME280_I2C(address=bme280_i2c.BME280_I2C_ADDR_SEC, i2c=i2c)
# Configure the sensor for the application in question.
bme.set_measurement_settings({
'filter': bme280_i2c.BME280_FILTER_COEFF_16,
'standby_time': bme280_i2c.BME280_STANDBY_TIME_500_US,
'osr_h': bme280_i2c.BME280_OVERSAMPLING_1X,
'osr_p': bme280_i2c.BME280_OVERSAMPLING_16X,
'osr_t': bme280_i2c.BME280_OVERSAMPLING_2X})
# Start the sensor automatically sensing
bme.set_power_mode(bme280_i2c.BME280_NORMAL_MODE)
client = MQTTClient(client_id="int_weather_station",
server="io.adafruit.com",
user=config.ADAFRUIT_IO_USERNAME,
password=config.ADAFRUIT_IO_KEY,
port=1883)
client.connect()
while 1:
bme_data = bme.get_measurement()
print(bme_data)
client.publish("{}/feeds/weather.interior-hum".format(config.ADAFRUIT_IO_USERNAME), "{:.0f}".format(bme_data["humidity"]))
time.sleep_ms(2000)
client.publish("{}/feeds/weather.interior-press".format(config.ADAFRUIT_IO_USERNAME), "{:.2f}".format(bme_data["pressure"]/100))
time.sleep_ms(2000)
client.publish("{}/feeds/weather.interior-temp2".format(config.ADAFRUIT_IO_USERNAME), "{:.1f}".format(bme_data["temperature"]))
time.sleep_ms(16000)