树莓派学习-DHT11温湿度读取（GPIO接口）

1.接线顺序可以参照下图：

2.python代码如下所示，DHT11.py：

import RPi.GPIO as GPIO 
import time 

defaultT=14
defaultS=50

while(1):
channel =4 
GPIO.setmode(GPIO.BCM)
data = [] 
j = 0
time.sleep(1) 
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

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:
defaultT=temperature
defaultS=humidity
print ("temperature :", temperature, "*C, humidity :", humidity, "%") 
else: 
print ("temperature :", defaultT, "*C, humidity :", defaultS, "%") 
time.sleep(0.5)
GPIO.cleanup()

3.运行结果如图：

本文作者： 夏军谊
本文链接： https://www.xiajunyi.com/pages/p22.html
版权声明：本作品采用知识共享署名-非商业性使用-相同方式共享 4.0 国际许可协议进行许可。转载请注明出处！

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