Gets data from a DS18B20 digital temperature sensor conntected to a Raspberry Pi and write to the PI System via PI Web API.

WriteTemp.py

import requests
import time
import os
import glob
import re

base_url = 'https://<PI Web API server>/piwebapi'
webId = '<WebId to PI tag>'
base_dir = '/sys/bus/w1/devices/'
yes_pattern = re.compile(r'YES')
temp_pattern = re.compile('t=(\d+)')

def initialize_sensor():
    os.system('sudo modprobe w1-gpio')
    os.system('sudo modprobe w1-therm')

def get_sensor_file():
    device_folder = glob.glob(base_dir + '28-*')[0]
    return device_folder + '/w1_slave'

def read_temp_raw(file):
    f = open(device_file,'r')
    lines = f.read()
    f.close()
    return lines

def read_temp(file):
    lines = read_temp_raw(file)
    while not yes_pattern.search(lines):
        time.sleep(0.2)
        lines = read_temp_raw(file)
    temp_string = temp_pattern.search(lines).group(1)
    temp_c = float(temp_string) / 1000.0
    temp_f = temp_c * 9.0 / 5.0 + 32.0
    return temp_f


def post_pi_value(value):
    data = {'Value': value}
    headers = {'Content-Type': 'application/json'}
    response = requests.post(base_url + '/streams/' + webId + '/value', json=data, headers=headers, verify=False)
    return response

if __name__ == '__main__':
    initialize_sensor()
    device_file = get_sensor_file()
    while True:
        value = read_temp(device_file)
        response = post_pi_value(value)
        print(response)
        time.sleep(5)