树莓派3B+，DHT11，python测试

物理连接

附树莓派3B+针脚说明

树莓派python IDE是商家安装.

实际打开新建文档编辑代码，估计使用的是新版编译器，网上的代码无法直接使用，会报print错误。

略作修改后如下

import RPi.GPIO as GPIO
import time
 
channel = 4			#引脚号4
data = []			#温湿度值
j = 0				#计数器
 
GPIO.setmode(GPIO.BCM)		#以BCM编码格式
 
time.sleep(1)			#时延一秒
 
GPIO.setup(channel, GPIO.OUT)
 
GPIO.output(channel, GPIO.LOW)
time.sleep(0.02)		#给信号提示传感器开始工作
GPIO.output(channel, GPIO.HIGH)
 
GPIO.setup(channel, GPIO.IN)
 
while GPIO.input(channel) == GPIO.LOW:
	continue
 
while GPIO.input(channel) == GPIO.HIGH:
	continue
 
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)				#输出初始数据高低电平
 
humidity_bit = data[0:8]		#分组
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)				#转换成十进制数据
	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		#十进制的数据相加
 
if check == tmp:								#数据校验，相等则输出
	print ("temperature : ", temperature, ", humidity : " , humidity)
else:										#错误输出错误信息，和校验数据
	print ("wrong")
	print ("temperature : ", temperature, ", humidity : " , humidity, " check : ", check, " tmp : ", tmp)
 
GPIO.cleanup()	

调试结果

可以正常读数。如果数据校验错误，会有wrong提示.

参考：

https://blog.csdn.net/CSDN_laoganma_com/article/details/81907601

https://blog.csdn.net/guyang1995/article/details/54692810