Lezer Alarm Arduino Projects

Lezer Alarm 

 int laserPin = 3;

int sensorPin = A0;

int buttonPin = 12;

int buzzerPin = 11;

int laserThreshold = 250; //  LDR LIGHT SENCITIVITY VALUE

void setup() {

pinMode(laserPin, OUTPUT);

pinMode(buttonPin, INPUT_PULLUP);

Serial.begin(9600);

}

boolean alarmState = false;

void loop() {

if (! alarmState) {

delay(1000);

digitalWrite(laserPin, HIGH);

delay(10);

unsigned long startTime = millis();

while (millis() - startTime < 1000) {

int sensorValue = analogRead(sensorPin);

Serial.println(sensorValue);

if (sensorValue > laserThreshold) {

alarmState = true;

break;

}

delay(10);

}

digitalWrite(laserPin, LOW);

} else {

tone(buzzerPin, 440);

if (! digitalRead(buttonPin)) {

alarmState = false;

noTone(buzzerPin);

}

delay(10);

}

}