Capture Dallas ds18b20 sensor temperature data and post it to Home Assistant (base source https://www.mkompf.com/weather/pionewiremini.html)

setup.bash

echo '2-57/5 * * * * HA_TOKEN=OOOO HA_HOST=tik.tok.org python3 $HOME/temperature.py >> $HOME/temperature.log 2>&1' | crontab -

temperature.py

#!/usr/bin/python
# -*- coding: utf-8 -*-

import re, os, time, json
import http.client

HA_HOST = os.environ.get('HA_HOST')
HA_TOKEN = os.environ.get('HA_TOKEN')

# function: read and parse sensor data file
def read_sensor(path):
  value = "U"
  try:
    f = open(path, "r")
    line = f.readline()

    if re.match(r"([0-9a-f]{2} ){9}: crc=[0-9a-f]{2} YES", line):
      line = f.readline()
      m = re.match(r"([0-9a-f]{2} ){9}t=([+-]?[0-9]+)", line)
      if m:
        value = str(float(m.group(2)) / 1000.0)
    f.close()
  except IOError as e:
    print(time.strftime("%x %X"), "Error reading", path, ": ", e)
  return value

def post_sensor(value):
  conn = http.client.HTTPSConnection(HA_HOST)

  payload = json.JSONEncoder().encode({
    'state': value,
    'attributes': {
      'unit_of_measurement': '°C'
    }  
  })

  headers = {
      'Content-Type': 'application/json',
      'Authorization': 'Bearer {}'.format(HA_TOKEN)
    }

  conn.request("POST", "/api/states/sensor.garage_temperature", payload, headers)

  res = conn.getresponse()
  data = res.read()
  print(data.decode("utf-8"))

  conn.close()

def main():
  # define pathes to 1-wire sensor data
  sensor_path = '/sys/bus/w1/devices/28-03129779e066/w1_slave'

  # read sensor data
  sensor_reading = read_sensor(sensor_path)
  post_sensor(sensor_reading)
  print(sensor_reading)

if __name__ == "__main__":
    main()