Original SPA Idea Documentation

Situation: Cat is on the counter.
Decision: If the cat is on the counter, play an alarm to scare him with a blinking LED.
Action: Execute script that plays the alarm and blinks the LED.

I started my experiment by finding a YouTube video that utilized Arduino to create an alarm that would sound in the event that light came into contact with the LDR.

However, this was the opposite of what I was hoping my project would do, as I imagined my cat would be covering up the LDR when he climbed onto the kitchen counter. I ended up making a very small change to the code by switching the variables so that the alarm would sound in the absence of light. I also added some text to the serial monitor as further indication that my cat was being bad.

//set pin numbers

const int ledPin = 13;

const int buzzerPin = 12;

const int ldrPin = A0;

void setup(){

  Serial.begin(9600);

  pinMode(ledPin, OUTPUT);

  pinMode(buzzerPin, OUTPUT);

  pinMode(ldrPin, INPUT);

}

void loop() {

  int ldrStatus = analogRead(ldrPin); //read the state of LDR value

  if (ldrStatus <= 400) {

    tone(buzzerPin, 300);

    digitalWrite(ledPin, HIGH);

    delay(100);

    noTone(buzzerPin);

    digitalWrite(ledPin, LOW);

    delay(100);

    Serial.println("CAT IS ON THE COUNTER DANGER DANGER");

  }

  else {

    noTone(buzzerPin);

    digitalWrite(ledPin, LOW);

    Serial.println("No cat detected");

  }

}