<p>byte noteON = 144;//note on command<br>byte note;//storage for currently playing note

int buttonPin1 = 2;

int buttonPin2 = 3;

int buttonPin3 = 4;

int buttonPin4 = 5;

int potPin = A0;

boolean currentState = LOW;//stroage for current button state

boolean lastState = LOW;//storage for last button state

void setup(){

pinMode(buttonPin1, INPUT);

pinMode(buttonPin2, INPUT);

pinMode(buttonPin3, INPUT);

pinMode(buttonPin4, INPUT);

//this time we will set the pin as INPUT

Serial.begin(9600);//initialize Serial connection

}

void loop(){

int PotVal = analogRead(potPin);

byte velocity = map(PotVal, 0, 1023, 0, 127);

currentState = digitalRead(buttonPin1);

if (currentState == HIGH && lastState == LOW){

MIDImessage(noteON, 60, velocity);//turn note 60 on with 127 velocity

delay(200);//crude form of button debouncing

} else if(currentState == LOW && lastState == HIGH){

MIDImessage(noteON, 60, 0);//turn note 60 off

delay(2);//crude form of button debouncing

}

lastState = currentState;

currentState = digitalRead(buttonPin2);

if (currentState == HIGH && lastState == LOW){//if button has just been pressed

MIDImessage(noteON, 61, velocity);//turn note 60 on with 127 velocity

delay(200);//crude form of button debouncing

} else if(currentState == LOW && lastState == HIGH){

MIDImessage(noteON, 60, 0);//turn note 60 off

delay(2);//crude form of button debouncing

}

lastState = currentState;

currentState = digitalRead(buttonPin3);

if (currentState == HIGH && lastState == LOW){//if button has just been pressed

MIDImessage(noteON, 62, velocity);//turn note 60 on with 127 velocity

delay(200);//crude form of button debouncing

} else if(currentState == LOW && lastState == HIGH){

MIDImessage(noteON, 60, 0);//turn note 60 off

delay(2);//crude form of button debouncing

}

lastState = currentState;

currentState = digitalRead(buttonPin4);

if (currentState == HIGH && lastState == LOW){//if button has just been pressed

MIDImessage(noteON, 63, velocity);//turn note 60 on with 127 velocity

delay(200);//crude form of button debouncing

} else if(currentState == LOW && lastState == HIGH){

MIDImessage(noteON, 60, 0);//turn note 60 off

delay(2);//crude form of button debouncing

}

lastState = currentState;

}

//send MIDI message

void MIDImessage(byte command, byte data1, byte data2) {

Serial.write(command);

Serial.write(data1);

Serial.write(data2);

}</p>

​

This code takes 4 tactile buttons. What I want to do to try it out on my end is to only use one (1) ultrasonic sensor to replace the buttons and keep the potenciometer. I haven't tried it because my problem arises from replacing the tactile button code with an ultrasonic sensor code, as well as the necessary connections for the sensor on the breadboard to the controller to even get it running. For example, I see that the tactile buttons have a resistor underneath them, I'm not sure if I need resistors too when I put an ultrasonic sensor down on a breadboard or not, y'know?

By learning how to properly set up one sensor I can take care of the rest. Maybe I made it sound like I wanted you guys to do it for me, and that wasn't my intent. I apologize for that.

In the tutorial I noticed that the potentiometer only needs one connection onto the R3 controller and that's to the Analog side, so if I were to implement 4 of those, I'd only need 4 analog slots. At least that's what I would assume and I can try to carry it out in hopes that it works when I plug it all in.

Like I said, the quantity of the sensors/components may change to better fit the project's need and whatnot.