if(c == 'K'){
Serial3.println(temp);
}
When the Arduino receive the letter 'K' from the phone, it is supposed to send back the var "temp" to the app (i'm using a bluetooth module HC05). But the phone does not display only the var temp, but also the letter K and the other letters i've sent before. So I just wanna clear everything in the serial3 so the application only displays the var 'temp'.
You'll find a sample of the MIT AI2 code i'm using