Raspberry pi 4b 读取DHT22数据

1. 确保Raspberry Pi上有最新的更新

sudo apt-get update

2. 安装python 3-dev和python3-pip使用这两个包来与湿度传感器进行交互

sudo apt-get install python3-dev python3-pip

3. 安装最新版本的setuptools、wheel和pip python包。

sudo python3 -m pip install --upgrade pip setuptools wheel 

4. 将DHT库安装到Raspberry Pi上

sudo pip3 install Adafruit_DHT

5. 制作python脚本读取温度和湿度数据

import Adafruit_DHT
DHT_SENSOR = Adafruit_DHT.DHT22
DHT_PIN = 4
while True:
    humidity, temperature = Adafruit_DHT.read_retry(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))

或者

import os
import time
import Adafruit_DHT

DHT_SENSOR = Adafruit_DHT.DHT22
DHT_PIN = 4

try:
    f = open('/home/pi/humidity.csv', 'a+')
    if os.stat('/home/pi/humidity.csv').st_size == 0:
            f.write('Date,Time,Temperature,Humidityrn')
except:
    pass

while True:
    humidity, temperature = Adafruit_DHT.read_retry(DHT_SENSOR, DHT_PIN)

    if humidity is not None and temperature is not None:
        f.write('{0},{1},{2:0.1f}*C,{3:0.1f}%rn'.format(time.strftime('%m/%d/%y'), time.strftime('%H:%M'), temperature, humidity))
    else:
        print("Failed to retrieve data from humidity sensor")

    time.sleep(30)

6. 运行脚本，测试一下效果

python3 ~/humidity_logger.py

7. （可选：如果采用第一种方式读取数据请忽略）

cat ~/humidity.csv

参考连接：https://www.labno3.com/2021/03/21/raspberry-pi-humidity-sensor-using-the-dht22/