Testing and learning

Potentiometer

/*
 * Read a value from a potentiometer and display it on the serial monitor
 */

const int potPin = A0;

void setup() {
  Serial.begin(9600);
  pinMode(potPin, INPUT);
}

void loop() {
  int potValue = analogRead(potPin);
  Serial.println(potValue);
}

Speaker

/*
 * Play a note on a speaker
 */

const int speakerPin = 9;

void setup() {
  pinMode(speakerPin, OUTPUT);
}

void loop() {
  tone(speakerPin, 440); // Play the note A
}

Potentiometer and Speaker

/*
 * Read a value from the potentiometer and map it to the speaker
 */

const int speakerPin = 9;
const int potPin = A0;

void setup() {
  Serial.begin(9600);
  pinMode(potPin, INPUT);
  pinMode(speakerPin, OUTPUT);
}

void loop() {
  // map the value given by the potentiometer to a value understadood as hertz for the speaker
  int potValue = analogRead(potPin);
  int speakerValue = map(potValue, 0, 1023, 400, 3000);

  Serial.print("Value:");
  Serial.println(potValue);
  Serial.print("Volume:");
  Serial.println(speakerValue);

  tone(speakerPin, speakerValue);
}

Play a melody on a buzzer with a button

/*
 * Play a melody on a buzzer if a button is pushed ON.
 */

const int speakerPin = 12;
const int buttonPin = 2;

void setup() {
  pinMode(speakerPin, OUTPUT);
  pinMode(buttonPin, INPUT);
}

void loop() {
  // Read the button status
  int buttonStatus = digitalRead(buttonPin);

  // Play if the button is ON.
  if (buttonStatus == 1) {
    tone(speakerPin, 392); // Play the note G
    delay(200);
    tone(speakerPin, 392); 
    delay(200);
    tone(speakerPin, 392); 
    delay(200);
    tone(speakerPin, 440); // Play the note A
    delay(200);
    tone(speakerPin, 493.88); // Play the note B
    delay(400);
    tone(speakerPin, 440); 
    delay(400);
    tone(speakerPin, 392); 
    delay(200);
    tone(speakerPin, 493.88); 
    delay(200);
    tone(speakerPin, 440); 
    delay(200);
    tone(speakerPin, 440); 
    delay(200);
    tone(speakerPin, 392); 
    delay(800);
    noTone(speakerPin);
    delay(5000);
  }
}

Warning

I'm concerned about the timing of a project: multi-threading isn't allowed with Arduino. Jonah told me about "interrupt" and I'm gonna look at some options.

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Last update: January 28, 2022