//Buggy: Raise the tone's pitch when button 9 is pressed, lower it when button 2 is pressed int pitch = 40; void setup(){ pinMode(10,OUTPUT); //speaker set to OUTPUT pinMode(9,INPUT_PULLUP); //button that will raise the pitch of the tone pinMode(2,INPUT_PULLUP); //button that will lower the pitch of the tone } void loop(){ tone(10,pitch); //Play a tone of 'pitch' every time the loop runs. The value of 'pitch' will change if(digitalRead(9)==LOW){ //If button 9 is pressed, sending a LOW signal... pitch++; //increase the value of 'pitch' by one with the ++ command delay(2); //delay 2 milliseconds before running the rest of the void loop } else if(digitalRead(2)==LOW){ //if button 2 is pressed... pitch--; //decrease the value of 'pitch' by one with the -- command delay(2); //wait 2 milliseconds } } // (c) 2018 Let's Start Coding. License: www.letsstartcoding.com/bsdlicense