Watcher written on golang, its watch PPM from sensor and send alert to telegram if value increasing. Users who receiving alerts maybe more than one.

I use arduino mega 2560 + MH-Z19 sensor. You can get my example in folder "sketch".

1. Prepare your sensor, see sketch folder
2. Rename app.example.conf > app.conf and set your telegram token, user, com/port of sensor
3. go run main.go

/start - start watching
/stop - stop watching
/sleep 120 - sleep 120 minutes (120 is example)