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.

#define DETECT 2 // Pin 2 for sensor, connect to VCC

#define ACTION 8 // Pin 8 for sensor, connect to OUT

void setup(void) {

   Serial.begin(9600);

   pinMode(DETECT, INPUT);//define detect input pin

   pinMode (A0, OUTPUT);      // LED

   pinMode (A1, OUTPUT);      // LED

   pinMode(7, OUTPUT);        // Laser

   pinMode(4, INPUT);         // Button

   pinMode(10, OUTPUT);       //Buzzer

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

   pinMode(8, OUTPUT);        //Laser sensor

   digitalWrite(8, HIGH);     //Laser sensor

}

void loop() {

  int detected = digitalRead(DETECT);// Read laser sensor

  if(detected == HIGH)

  {

  // Disable Gun and buzz

  digitalWrite(A0,LOW);

  digitalWrite(A1,HIGH);

  digitalWrite(7,LOW);

  tone(10, 1000, 1000); //Beep

  delay(1000);

  noTone(10);

  delay(1000);

  digitalWrite(A1,LOW);

  detected = false;

  }else{

// Shoot Laser

 if (digitalRead(4) == LOW){

   digitalWrite(7, HIGH);

 }else{

   digitalWrite(7, LOW);

 }

 digitalWrite(A0,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