Published December 20, 2018 © GPL3+

Cockroach Laser Killer

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

BeginnerShowcase (no instructions)18,289

Things used in this project

Hardware components

Arduino Nano R3

SG90 Micro-servo motor

LDR sensor

Resistor 10k ohm

Jumper wires (generic)

Breadboard (generic)

The 170 points breadboard

9V battery (generic)

9V Battery Clip

Software apps and online services

Arduino IDE

Story

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.

A 7cm x 7cm box.

The inital setup. When energized, the servo lifts the target.

The target arised and the laser gun!

Creepy!

In the box with a smal breadboard.

Code

Cockroach Laser Killer

/*
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

Credits

NerdFatherRJ

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