-
- 转载的文章,当中也加了点自己的注释,希望原作者不要介意
- 原文地址:http://surenpi.com/2015/03/17/%e6%a0%91%e8%8e%93%e6%b4%be%e8%bf%9e%e6%8e%a5dht11/
- 介绍
- 接线
-
VCC接5V或者3.3V
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DATA接GPIO(我接的是BCM的16号针脚,物理针脚是36)
-
GND接GND
- 代码
-
#!/usr/bin/python
import RPi.GPIO as GPIO
import time
channel = 16 #引脚号16
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() #重置针脚- 测试
执行:sudo chmod 777 程序名.py
python 程序名.py