Week 10

const int ldrPin = A0;         // LDR connected to analog pin A0
const int buttonPin = 2;       // Button connected to digital pin 2
const int speakerPin = 9;      // Speaker connected to digital pin 9
const int ledPin = 13;         // LED connected to pin 13

// Dramatically different frequencies (non-musical)
int notes[] = {100, 300, 600, 900, 1200, 2000, 3000};

void setup() {
  pinMode(buttonPin, INPUT);         // Button logic: HIGH when pressed
  pinMode(speakerPin, OUTPUT);     
  pinMode(ledPin, OUTPUT);         
  Serial.begin(9600);              
}

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

  if (buttonState == HIGH) {
    int lightLevel = analogRead(ldrPin);         // Read LDR
    int noteIndex = map(lightLevel, 0, 1023, 6, 0); // Bright = low note
    noteIndex = constrain(noteIndex, 0, 6);      // Keep within range
    int frequency = notes[noteIndex];            // Pick frequency

    tone(speakerPin, frequency);                 // Play note
    digitalWrite(ledPin, HIGH);                  // LED on

    Serial.print("Light: ");
    Serial.print(lightLevel);
    Serial.print(" | Frequency: ");
    Serial.println(frequency);
  } else {
    noTone(speakerPin);            // No sound
    digitalWrite(ledPin, LOW);     // LED off
  }

  delay(100);
}