No buttons needed.
When you open the app, the phone automatic connect to your arduino via bluetooth,
and scanning the QR code, then open the door for 3 sec, and app closing, disconnect from arduino.
Arduino code in video description.
- Arduino nano v3
- HC-06 Bt module
- Relay modul (1 channel)
- Electrick lock (there is 2 type, im use which need power to open)