Snack theft detector

Has it ever happened to you, that someone stole your favorite snack or chocolate?
I have a solution for you!

What you will need:

• arduino
• a breadboard
• an infrared obstacle avoidance sensor
• a passive buzzer
• some wires
• some LEDs

Circuit:

We connect the buzzer to D5, the IR sensor to D4, one LED to D2 and another LED to D3.

Code:

    int led1 = 2; // First LED to D2
    int led2 = 3; // Second LED to D3
    int infraredPin = 4; // IR sensor to D4
    int buzzerPin = 5; // Passive buzzer to D5
    int objectDetection;

    void setup() {
      pinMode(led1, OUTPUT);
      pinMode(led2, OUTPUT);
      pinMode(infraredPin, INPUT);
      pinMode(buzzerPin, OUTPUT);
    }

    void loop() { 
      objectDetection = digitalRead(infraredPin); //We save the value of the IR obstacle avoidance sensor in this variable. It can be only 0 or 1.
      
      // When the sensor detects an object the arduino plays a melody and turns on the LEDs.
      if (objectDetection == 0){ 
        tone(buzzerPin, 1000, 100);
        digitalWrite(led1, 1);
        digitalWrite(led2, 0);
        delay(50);
        tone(buzzerPin, 970, 100);
        digitalWrite(led1, 0);
        digitalWrite(led2, 1);
        delay(50);
      }
      else{
        noTone(buzzerPin);
        digitalWrite(led1, 0);
        digitalWrite(led2, 0);
      }
    }
    

Just upload the code to your arduino, and put the sensor under your snack!

Result: