Digital Electronics Lecture Assign 3

Digital Electronics Lecture 3

PART 1: This midi keyboard is different from the previous ones we have done. In this keyboard there is no delay when a button is pressed and when a sound is heard. This midi keyboard also has a variable sustain. I accomplished this using if statements that check for the exact moment a button is pressed and released to send MIDI information. This works more precisely, rather than using the send midi function off after the delay.

int ledPin1 = 28; //setting pins and variable names
int ledPin2 = 29;
int ledPin3 = 30;
int ledPin4 = 31;
int buttonPin1 = 33;
int buttonPin2 = 34;
int buttonPin3 = 35;
int buttonPin4 = 36;
bool buttonPress1= LOW; //boolian 
bool lastButtonPress1= LOW;
bool buttonPress2= LOW;
bool lastButtonPress2= LOW;
bool buttonPress3= LOW;
bool lastButtonPress3= LOW;
bool buttonPress4= LOW;
bool lastButtonPress4= LOW;

void setup() {
    Serial.begin(9600);

    pinMode(ledPin1, OUTPUT); //pin mode
    pinMode(ledPin2, OUTPUT);
    pinMode(ledPin3, OUTPUT);
    pinMode(ledPin4, OUTPUT);

    pinMode(buttonPin1, INPUT);
    pinMode(buttonPin2, INPUT);
    pinMode(buttonPin3, INPUT);
    pinMode(buttonPin4, INPUT);

}

void loop() { //checkbutton function
  checkButton();

}

void checkButton(){
  checkButton1();
  checkButton2();
  checkButton3();
  checkButton4();
  
}

void checkButton1(){ //checkbutton function for each button
  lastButtonPress1=buttonPress1;
  buttonPress1=digitalRead(buttonPin1);
  if( (buttonPress1 == HIGH) and (lastButtonPress1 == LOW)){
    usbMIDI.sendNoteOn(60, 90, 1);
    digitalWrite(ledPin1, HIGH);
    delay(5); //setting the delay to 5
  } else if (lastButtonPress1 == HIGH and buttonPress1== LOW){
    usbMIDI.sendNoteOff(60, 0, 1);
    digitalWrite(ledPin1, LOW);
    delay(5);
  }
}

void checkButton2(){
  lastButtonPress2=buttonPress2;
  buttonPress2=digitalRead(buttonPin2);
  if( (buttonPress2 == HIGH) and (lastButtonPress2 == LOW)){
    usbMIDI.sendNoteOn(64, 90, 1);
    digitalWrite(ledPin2, HIGH);
    delay(5);
  } else if (lastButtonPress2 == HIGH and buttonPress2== LOW){
    usbMIDI.sendNoteOff(64, 0, 1);
    digitalWrite(ledPin2, LOW);
    delay(5);
  }
}

void checkButton3(){
  lastButtonPress3=buttonPress3;
  buttonPress3=digitalRead(buttonPin3);
  if( (buttonPress3 == HIGH) and (lastButtonPress3 == LOW)){
    usbMIDI.sendNoteOn(67, 90, 1);
    digitalWrite(ledPin3, HIGH);
    delay(5);
  } else if (lastButtonPress3 == HIGH and buttonPress3 == LOW){
    usbMIDI.sendNoteOff(67, 0, 1);
    digitalWrite(ledPin3, LOW);
    delay(5);
  }
}

PART 2: Potentiometer demo

int potVal = 0; //setting up variables and starting values
int lastPotVal = 0;

void setup() { //serial begin
  Serial.begin(9600);
}

void loop() { //loop using the map function.
  lastPotVal = potVal;
  potVal = map(analogRead(A13), 0 , 1023, 0, 10);
  if(potVal != lastPotVal) {
    Serial.println(potVal); //prints value in serial monitor
    delay(10);
  }
}