Skip to content

Instantly share code, notes, and snippets.

@enlavin
Created December 7, 2016 19:21
Show Gist options
  • Save enlavin/cf4b324f8955bc56ce0ff9399d9fdea6 to your computer and use it in GitHub Desktop.
Save enlavin/cf4b324f8955bc56ce0ff9399d9fdea6 to your computer and use it in GitHub Desktop.
Read temperature from a DS18B20 and send a message to a MQTT broker using micropython
import ds18x20
import gc
from machine import Timer, Pin
import network
import onewire
from time import sleep_ms
from umqtt.simple import MQTTClient
import urandom
PIN_TEMP = 5
def send_temp(t):
c = MQTTClient('clientname', '<mqtt_server_ip>')
c.connect()
c.publish('/topic/temp1', str(t))
sleep_ms(500)
print('Sent!')
c.disconnect()
def read_temp():
ds = ds18x20.DS18X20(onewire.OneWire(Pin(5)))
roms = ds.scan()
ds.convert_temp()
sleep_ms(100)
# assume there is only 1 probe
return ds.read_temp(roms[0])
def run():
# tim = Timer(-1)
# tim.init(period=2000, mode=Timer.PERIODIC, callback=send_temp)
wlan = network.WLAN(network.STA_IF)
while True:
try:
if wlan.isconnected():
t = read_temp()
send_temp(t)
sleep_ms(10000)
else:
sleep_ms(1000)
except:
pass
run()
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment