树莓派连接DHT11温湿度传感器(python)
Posted
tags:
篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了树莓派连接DHT11温湿度传感器(python)相关的知识,希望对你有一定的参考价值。
-
- 介绍
- 接线
- VCC接5V或者3.3V
- 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
以上是关于树莓派连接DHT11温湿度传感器(python)的主要内容,如果未能解决你的问题,请参考以下文章