Project showcase
Cockroach Laser Killer

Cockroach Laser Killer © GPL3+

Kill this terrifying bug at any distance with a laser ray! (Or dream about it...)

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Components and supplies

Apps and online services

About this project

If you feel terrified about cockroaches...

You problem is now solved with " Cockroach Laser Killer!

No more embarrassing excuses to run off from them!

Or dream about it...

Video

Okay...this is a simple LDR and Servo interaction. Geta laser pen and "shoot" at the target. LDR activates a servo motor to drop your target down. 3 seconds later it goes up again for another shot.

The main issue is to set the correct threshold of the LDR sensor and avoid unwanted movements due to light conditions.

Code

Cockroach Laser KillerArduino
/*
Project - Interaction LDR x Servo
 */
#include <Servo.h>

Servo servo1;  // Servo object

int pinServo = 2;    // variable to store the servo position
int triggerPoint = 970; //trigger point to start servo
byte sensor = A0; 
int sensorValue;

void setup() {
  pinMode(pinServo, OUTPUT);
  servo1.attach(pinServo);  // attaches the servo pin  
  servo1.write(155);// tell servo to go to "up" position
  delay(200);
  pinMode(sensor, INPUT);
}

void loop() {
  sensorValue = analogRead(sensor);
    if (sensorValue > triggerPoint){
    servo1.write(75); // tell servo to go to "down" position
    delay(3000);
    servo1.write(155);
    delay(200);
    }
}//End loop

Schematics

Project Schematics
Bkscheme njfny7eg38

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