온습도 센서 연결하기 > 라즈베리파이

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종류에 따라 연결방식이 다름

참고사이트 : http://www.acronet.kr/24632 

                   https://www.thegeekpub.com/236867/using-the-dht11-temperature-sensor-with-the-raspberry-pi/

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> sudo apt-get install python3-dev python3-pip

> sudo python3 -m pip install --upgrade pip setuptools weel

> sudo pip3 install Adafruit_DHT  (구 모듈)

> sudo pip3 install adafruit-circuitpython-dht  (새 모듈)

                   참고사이트 : https://github.com/adafruit/Adafruit_CircuitPython_DHT 

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구 모듈 이용한 소스

import Adafruit_DHT
import time
from datetime import datetime

DHT_SENSOR = Adafruit_DHT.DHT22
DHT_PIN = 4
PROBE_NAME = "PI4"

humidity, temperature = Adafruit_DHT.read_retry(DHT_SENSOR, DHT_PIN)

if humidity is not None and temperature is not None:
    print("{2} - T={0:0.1f} H={1:0.1f}".format(temperature, humidity, datetime.now()))
else:
    print("Failed to retrieve data from humidity sensor")

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두번째 소스

import Adafruit_DHT
import time

DHT_SENSOR = Adafruit_DHT.DHT11
DHT_PIN = 4

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(3);
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에러발생시
/usr/local/lib/python3.7/dist-packages/Adafruit_DHT/platform_detect.py 

파일을 열어서, 하단의 
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else:
    # Something else, not a pi.
    return None

아래로 교체
else:
    # Something else, PI 4 MODEL B
    return 3
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신 모듈 이용하기
import adafruit_dht
import time

dht_device = adafruit_dht.DHT11(4)
#dht_device = adafruit_dht.DHT22(4)

try:
    while True:
        t = dht_device.temperature
        h = dht_device.humidity
        print ("t=>", t, "  h=>", h)

        time.sleep(100)

except KeyboardInterrupt:
    print("Terminated by Keyboard")

finally:
    print("End of Program")
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