树莓派使用DS18B20模块测量温度

1

2

apt-get update

apt-get upgrade

1

sudo nano /boot/config.txt

1

dtoverlay=w1-gpio-pullup,gpiopin=4

1

2

3

4

sudo modprobe w1-gpio

sudo modprobe w1-therm

cd /sys/bus/w1/devices/

ls

1

2

3

pi@raspberrypi:~$ cd /sys/bus/w1/devices/

pi@raspberrypi:/sys/bus/w1/devices$ ls

28-00000494cb79 w1_bus_master1

1

2

cd 28-00000494cb79

cat w1_slave

1

2

70 01 4b 46 7f ff 10 10 e1 : crc=e1 YES

70 01 4b 46 7f ff 10 10 e1 t=23000

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

#/home/pi/temperature.py

打开温度传感器文件

tfile = open("/sys/bus/w1/devices/28-00000494cb79/w1_slave")

#阅读文件的所有内容

text = tfile.read()

#关闭文件

tfile.close()

#用换行符分割字符串成数组，并取第二行

secondline = text.split("\n")[1]

#用空格将字符串成数组，取最后一个，即t=23000

temperaturedata = secondline.split(" ")[9]

#取t=后面的值转换为浮点型

temperature = float(temperaturedata[2:])

#转换单位为摄氏度

temperature = temperature / 1000

#打印值

print temperature

1

2

3

4

{

“timestamp”:”2012-03-15T16:13:14″,

“value”:294.34

}

1

2

3

4

5

6

7

8

9

10

11

12

#/home/pi/temperature.py

tfile = open("/sys/bus/w1/devices/28-00000494cb79/w1_slave")

text = tfile.read()

tfile.close()

secondline = text.split("\n")[1]

temperaturedata = secondline.split(" ")[9]

temperature = float(temperaturedata[2:])

temperature = temperature / 1000

res = '{"value":%f}' %temperature

output = open('/home/pi/datafile.txt', 'w')

output.write(res)

output.close

1

2

sudo python /home/pi/temperature.py

curl --request POST --data-binary @"/home/pi/datafile.txt" --header "U-ApiKey:XXXXXXXXXXXXXXXX" http://api.yeelink.net/v1.0/device/1969/sensor/2533/datapoints

1

2

3

4

5

6

#为脚本增加可执行权限

sudo chmod +x yeelink.sh

#将脚本加入cronjob（计划任务）

sudo crontab -e

#在cornjob文件中添加下面一行，并保存(表示10分钟执行一下脚本，时间可自行修改)

*/10 * * * * /home/pi/yeelink.sh