Lesson 4

In this lesson, you'll learn add a buzzer and finish up the code.

Before we start, make sure the Arduino is connected to your computer(see homepage is you need help).

^Your breadboard should now look like this ^

Now, copy and paste this code into the Arduino IDE.

//Arduino Laser Tag Gun with sensor and buzzer

//Code by Captain Richard

// ===== SENSOR SELECTION =====

// Set to 1 for the brown sensor, or 0 for the blue sensor

#define SENSOR_BROWN 1  // Change to 0 if using the blue sensor

void setup(void) {

   Serial.begin(9600);

   pinMode(2, INPUT);       // Sensor "out"

   pinMode(A0, OUTPUT);     // LED

   pinMode(A1, OUTPUT);     // LED

   pinMode(7, OUTPUT);      // Laser

   pinMode(10, OUTPUT);     // Buzzer

   pinMode(4, INPUT);       // Button

   digitalWrite(4, HIGH);   // Turn Button on

   // Print selected sensor type to Serial Monitor

   #if SENSOR_BROWN

       Serial.println("Sensor Type: Brown (Normal)");

   #else

       Serial.println("Sensor Type: Blue (Inverted)");

   #endif

}

void loop() {

    // Laser Sensor code

    int detected = digitalRead(2); // Read Laser sensor

    // Adjust for sensor type

    bool isHit = SENSOR_BROWN ? (detected == HIGH) : (detected == LOW);

    if (isHit) {

        // Disable Gun and Buzz

        digitalWrite(A1, LOW);

        digitalWrite(A0, HIGH);

        digitalWrite(7, LOW);

        tone(10, 3000, 1000); // 1st beep

        delay(1000);

        noTone(10);

        delay(1000);

        tone(10, 2000, 1000); // 2nd beep

        delay(1000);

        noTone(10);

        delay(1000);

        tone(10, 1000, 1000); // 3rd beep

        delay(1000);

        noTone(10);

        delay(1000);

        digitalWrite(A0, LOW);

    } else {

        // Shoot Laser

        if (digitalRead(4) == LOW) {

            digitalWrite(7, HIGH);

        } else {

            digitalWrite(7, LOW);

        }

        digitalWrite(A1, HIGH);

    }

}

Now, click upload. Make sure the Arduino is plugged into your computer!

Now when the laser shines into the receiver, the LED should change colors, the buzzer should buzz, and the laser should switch off for one second.

You now have a working laser tag module!

Troubleshooting

If the buzzer isn't buzzing when you shine the laser on the receiver, try these steps.

• Make sure the buzzer is connected to the right pins

• Make sure the code uploaded to the Arduino and has no errors

• Try swapping a component for GND and the blue "-" row

If these tips don't work, try to troubleshoot online or contact us.

Almost Done!

Lessons