Raspberry+am2302温湿度センサーで温湿度を計測する

GPIOに繋がる

https://github.com/adrianlois/RaspberryPi-sensor-dht22-am2302-thingspeak を参考して
am2302温湿度センサーをraspberry piのGPIOに繋がる。

Pythonの設置

pip install --upgrade pip setuptools wheel
pip install Adafruit_DHT

Adafruit_DHTはpython2とpython3両方対応しています

python code

AdafruitDHT.py

import sys
import Adafruit_DHT


sensor_args = { '11': Adafruit_DHT.DHT11,
                '22': Adafruit_DHT.DHT22,
                '2302': Adafruit_DHT.AM2302 }
if len(sys.argv) == 3 and sys.argv[1] in sensor_args:
    sensor = sensor_args[sys.argv[1]]　#センサーのタイプー
    pin = sys.argv[2] #GPIOのpinナンバー
else:
    print('Usage: sudo ./Adafruit_DHT.py [11|22|2302] <GPIO pin number>')
    print('Example: sudo ./Adafruit_DHT.py 2302 4 - Read from an AM2302 connected to GPIO pin #4')
    sys.exit(1)

humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)

if humidity is not None and temperature is not None:
    print('Temp={0:0.1f}*  Humidity={1:0.1f}%'.format(temperature, humidity))
else:
    print('Failed to get reading. Try again!')
    sys.exit(1)

実行

python AdafruitDHT.py 2302 4