64 lines
1.9 KiB
Python
64 lines
1.9 KiB
Python
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#!/usr/bin/python3
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# -*- coding: utf8 -*-
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#Get LM75 temperature value and send it to MQTT broker
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import smbus
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import paho.mqtt.publish as mqtt
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import datetime
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# MQTT settings
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mqtt_server = 'localhost'
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mqtt_port= 1883
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mqtt_auth= {'username':'cameteo',
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'password':'CaMeteo'}
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mqtt_client_id= 'papirus_temp2mqtt'
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mqtt_qos=2
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mqtt_topic="pi/papirus_zero_hat/temperature/"
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#LM75B settings
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LM75B_ADDRESS = 0x48
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LM75B_TEMP_REGISTER = 0
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LM75B_CONF_REGISTER = 1
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LM75B_THYST_REGISTER = 2
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LM75B_TOS_REGISTER = 3
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LM75B_CONF_NORMAL = 0
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class LM75B(object):
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def __init__(self, address=LM75B_ADDRESS, busnum=1):
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self._address = address
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self._bus = smbus.SMBus(busnum)
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self._bus.write_byte_data(self._address, LM75B_CONF_REGISTER, LM75B_CONF_NORMAL)
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def getTempC(self):
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"""Return temperature in degrees Celsius"""
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raw = self._bus.read_word_data(self._address, LM75B_TEMP_REGISTER) & 0xFFFF
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raw = (((raw << 8) & 0xFF00) + (raw >> 8) +128 ) /256
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return raw
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########
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# Main #
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########
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#Get and print data
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date = datetime.datetime.now().replace(microsecond=0).isoformat()
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print(date)
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sens = LM75B()
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lm75_temp = sens.getTempC()
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print("Temperature (Papirus HAT LM75b) : %s °C" % lm75_temp)
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#Send data to MQTT broker
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mqtt_data = [{'topic':mqtt_topic + "value", 'payload':lm75_temp, 'qos':mqtt_qos, 'retain':True},
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{'topic':mqtt_topic + "date", 'payload':date, 'qos':mqtt_qos, 'retain':True},
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{'topic':mqtt_topic + "unit", 'payload':"\u00B0C", 'qos':mqtt_qos, 'retain':True},
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{'topic':mqtt_topic + "desc", 'payload':"LM75b sensor", 'qos':mqtt_qos, 'retain':True}]
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mqtt.multiple(mqtt_data,
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hostname= mqtt_server ,
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port= mqtt_port ,
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auth= mqtt_auth ,
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client_id= mqtt_client_id )
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