How to implement cubieboard PM2.5 Monitoring Mini Program
This article mainly explains "how to achieve cubieboard PM2.5 monitoring Mini Program". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn how to achieve cubieboard PM2.5 monitoring Mini Program.
If the led light is green, the air quality is good (excellent and good)
If the led light is blue, the air is slightly polluted
If the led light shows orange, it means that the air pollution is serious (moderate pollution and above)
If the led light is white, air pollution data is currently not available
The data is updated every half hour.
This program is a shell script program:
#! / bin/bash
# api key: http://www.pm25.in/api_doc
Api_key= "5j1znBVAsnSf5xQyNQyq"
City= "shanghai"
Lighten_led () {
Ls / sys/class/leds/*/brightness | xargs-I-N1 echo "echo 0 > {}" | sh
Echo 1 > / sys/class/leds/$1*/brightness
}
Get_quality () {
Local api= "http://www.pm25.in/api/querys/pm2_5.json?city=$1&stations=no&token=$api_key"
Wget-- quiet-- no-check-certificate-- output-document=- $api | sed's quality.\ +, "quality": "\ ([^"]\ +\) ".\ + /\ 1bind'
}
Update_quality () {
Local quality=$ (get_quality $city)
If ["$quality" = = "excellent"] | | ["$quality" = = "good"]; then
Lighten_led green
Elif ["$quality" = = 'mild pollution']; then
Lighten_led blue
Elif ["$quality" = = 'moderate pollution'] | | ["$quality" = = 'severe pollution'] | | ["$quality" = = 'serious pollution']; then
Lighten_led orange
Else
Lighten_led white
Fi
}
While true; do
Update_quality
Sleep 1800
Done
First of all, you need to configure this script. Api_key needs to apply, and the default api_key may not work well.
Then modify the city. The value here is shanghai, which needs to be changed to the city you need to monitor.
After the configuration is complete, save this script and execute it at boot time (add / etc/rc.local)
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