树莓派与DHT-11温湿度传感器
DHT-11的OUT输出连接GPIO.7引脚，VCC接电源(3~5v即可)，GND接地。 连接好后在树莓派上开始编程： Collect.py:
import RPi.GPIO as GPIO import time def collect(): THdata = [] channel = 4 data = [] GPIO.setmode(GPIO.BCM) time.sleep(2) GPIO.setup(channel, GPIO.OUT) GPIO.output(channel, GPIO.LOW) time.sleep(0.02) GPIO.output(channel, GPIO.HIGH) GPIO.setup(channel, GPIO.IN) while GPIO.input(channel) == GPIO.LOW: continue while GPIO.input(channel) == GPIO.HIGH: continue j = 0 while j < 40: k = 0 while GPIO.input(channel) == GPIO.LOW: continue while GPIO.input(channel) == GPIO.HIGH: k += 1 if k > 100: break if k < 8: data.append(0) else: data.append(1) j += 1 # print("sensor is working.") # print(data) humidity_bit = data[0:8] humidity_point_bit = data[8:16] temperature_bit = data[16:24] temperature_point_bit = data[24:32] check_bit = data[32:40] humidity = 0 humidity_point = 0 temperature = 0 temperature_point = 0 check = 0 for i in range(8): humidity += humidity_bit[i] * 2 ** (7 - i) humidity_point += humidity_point_bit[i] * 2 ** (7 - i) temperature += temperature_bit[i] * 2 ** (7 - i) temperature_point += temperature_point_bit[i] * 2 ** (7 - i) check += check_bit[i] * 2 ** (7 - i) tmp = humidity + humidity_point + temperature + temperature_point if check == tmp: print("temperature :", temperature, "*C", " humidity :", humidity, "%") THdata.append(temperature) THdata.append(humidity) return THdata else: # print("wrong") time.sleep(1) return collect() while True: rHdata = collect() time.sleep(3)