Category: raspberrypi

pip3 install adafruit-circuitpython-dht
apt-get install libgpiod2

temp.py

import Adafruit_DHT
import time
 
DHT_SENSOR = Adafruit_DHT.DHT11
DHT_PIN = 4

#while loop is there because sometime it does not get the temp.
while True:
    humidity, temperature = Adafruit_DHT.read(DHT_SENSOR, DHT_PIN)
    if humidity is not None and temperature is not None:
        print("Temp={0:0.1f}C Humidity={1:0.1f}%".format(temperature, humidity))
    else:
        print("Sensor failure. Check wiring.");
    time.sleep(1);

run:

python3 temp.py

For DHT22 sensor:

temp-dht22.py

import Adafruit_DHT
import time

DHT_SENSOR = Adafruit_DHT.DHT22
DHT_PIN = 4

humidity, temperature = Adafruit_DHT.read(DHT_SENSOR, DHT_PIN)
if humidity is not None and temperature is not None:
    #print("Temp={0:0.1f}C Humidity={1:0.1f}%".format(temperature, humidity))
    print("{0},{1}".format(temperature, humidity))

• shell script to send over pushgateway

root@lp-arm-1:~# cat /opt/cron/get_temp_dht22.sh
#!/bin/bash

t_and_h=$(python3 /opt/cron/get_temp_dht22.py)

temprerature=$(echo $t_and_h | awk -F ',' '{print $1}')
humidity=$(echo $t_and_h | awk -F ',' '{print $2}')
echo "room_temp $temprerature" | curl --data-binary @- http://192.168.0.183:30008/metrics/job/room_temp/instance/lp-arm-1
echo "room_humidity $humidity" | curl --data-binary @- http://192.168.0.183:30008/metrics/job/room_humidity/instance/lp-arm-1