Photo Buzzy Blink

Continuing on from the Photo Blink circuit, we add a piezo buzzer. This is guaranteed to drive anyone near you over the age of 10 completely crazy. (Under 10, they tend to love anything that makes noise.)

photo_buzzy_blink.ino

const int ledPin = 3;     // LED connected to pin 3
const int sensorPin = 0;  // photoresistor on analog 0
const int buzzerPin = 9;  // pin where the buzzer is connected
 
// minimum and maximum blink rates
const int minDuration = 100;
const int maxDuration = 1000;
 
void setup() {
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
}
 
void loop() {
  int rate = analogRead(sensorPin);
  Serial.println(rate);
//  rate = map(rate, 0, 800, minDuration, maxDuration);
  digitalWrite(ledPin, HIGH);
  tone(buzzerPin, rate, rate);
  delay(rate);
  digitalWrite(ledPin, LOW);
  delay(rate);
}