1、ds18b20管脚
1-3管脚依次为GND DQ VCC,DQ接树莓派的GPIO4
2、编写脚本
cd /home/pi/ds18b.py
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# -*- coding:utf-8 -*-
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#没有上面一行代码就不能使用中文注释,否则就会报错
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import RPi.GPIO as GPIO
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import time
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import requests
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import json
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#从DS18B20读取温度值
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def readtemperature():
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file=open("/sys/bus/w1/devices/28-0000024a8c0b/w1_slave")
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#read temprature
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text=file.read()
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#close file
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file.close()
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secondline = text.split("\n")[1]
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temperaturedata = secondline.split(" ")[9]
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temperature = float(temperaturedata[2:])
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temperature = temperature / 1000
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return temperature
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#将温度值上传到yeelink
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try:
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while True:
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# 设备URI
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apiurl = 'http://api.yeelink.net/v1.1/device/16485/sensor/28543/datapoints'
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# 用户密码, 指定上传编码为JSON格式
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apiheaders = {'U-ApiKey': '9908e3876669432610e9a3ac2fb0xxxx', 'content-type': 'application/json'}
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#获ds18b20 温度
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temp=readtemperature()
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print 'ds18b20 temperature is %0.1f c' %temp
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payload = {'value': temp}
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#发送请求,10s的频率
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r = requests.post(apiurl, headers=apiheaders, data=json.dumps(payload))
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time.sleep(10)
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except KeyboardInterrupt:
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GPIO.cleanup()
代码截图如下:
3、加载驱动
modprobe w1-gpio
modprobe w1-therm
4、运行脚本
python ds18b.py
效果如下:
5、yeelink效果如下:
6、因为重启后ds18b20的驱动会失效,将
modprobe w1-gpio
modprobe w1-therm
加入rc.local
nano /etc/rc.local
效果如下:
7、获取ds18b20序列号的方法
modprobe w1-gpio
modprobe w1-therm
cd /sys/bus/w1/devices/
ls
显示出的28-xxxxxx就是ds18b20的序列号
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