keen laser code

laser.ino

int laser = 0;
unsigned int lastPublish = 0;
bool lastState = false;

void setup() {
    pinMode(A0, INPUT_PULLDOWN);
    pinMode(D7, OUTPUT);
}

void loop() {
    int val = analogRead(A0);
    unsigned int now = millis();
    unsigned int elapsed = now - lastPublish;


    bool broken = val < 4000;
    if (broken == lastState) {
        return;
    }
    
    digitalWrite(D7, (broken) ? HIGH : LOW);
    
    if (elapsed >= 1000) {
        String topic = ((broken) ? "laser/alarm" : "laser/reset");
        String message = String(val);
        Spark.publish(topic, message);
        lastState = broken;
        lastPublish = millis();
    }
}