IR sensor cannot control the mobile application

Can i control my mobile application using IR Sensor that is connected to Arduino Uno?

Hello Shiraaa

Do you mean you want to send sensor data from an Arduino to your App Inventor App? If so, yes you can, typically using Bluetooth.

I have used the Bluetooth but it cannot change the screen, i'm using virtual scree. But i cannot used the ir sensor to go to next page. I wanted to do, if the sensors is block, it will go to the next screen

OK. So if the sensor is blocked, that would mean no data arriving - the data would be "" or length zero. So, when data of length zero is true, use an If Then Block to display the next virtual screen.

Something like this (blocks for selecting device etc omitted)

Edit: Importent to disable Timer