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Introduction:

In this project we are trying to implement a simple project using LASER with Arduino. The project idea revolves around creating a security system. Whenever any object will obstruct the LASER ray the alarm will start ringing.

Components Required:

  • Arduino NANO – Buy
  • LASER
  • Buzzer –
  • LDR – Buy
  • Resistors (1k)
  • Bread Board – Buy
  • Cable – Buy
  • Jumper wires (M-M, M-F)

Working:

The project basically works on the principle of interruption. If by any means the LASER light is interrupted the alarm will start ringing. The laser is a concentrated light source that puts out a straight beam of light of a single color. The LDR is sensitive to light and puts out a voltage when the laser light hits it. When the laser beam is interrupted and can’t reach LDR, its voltage output changes, and eventually the alarm will ring.

Circuit Diagram:

In circuit LED is used just to demonstrate, practically in place of LED we need to use

Code:

int ldrpin = A0;
int buzzpin = 13;
void setup ()
{
  Serial.begin(9600);
  pinMode (ldrpin, INPUT);
  pinMode (buzzpin, OUTPUT);
  buzz(200);
  delay(2000);
}
void loop ()
{
  int ldrval = analogRead(ldrpin);
  Serial.println(ldrval);
  if (ldrval <= 900)
  {
    buzz(500);
  }
}
void buzz(unsigned char time)
{

  digitalWrite(buzzpin, 170);
  delay (time);
  digitalWrite(buzzpin, 0);
  delay (time);
}