Drone Payload Dropping System Using Arduino & LDR Sensor

This project demonstrates a drone-based payload dropping system using an Arduino Uno, LDR sensor, and servo motor.

(The system automatically releases the payload when sufficient light is detected.)

🔹 Components Used

• Arduino Uno/Nano

• LDR Sensor Module (LM-393)

• Servo Motor (SG90 / MG90s)

• Jumper Wires

• Power Supply  ( Minimum - 7.4v DC )

🔹 Working Principle

The LDR sensor detects light intensity.
When light crosses a predefined threshold, Arduino activates the servo motor, which releases the payload from the drone.

🔌 CONNECTIONS (IMPORTANT)

LDR Module 

• S → A0

• + → 5V

• – → GND

Servo Motor

• Red → 5V

• Brown / Black → GND

• Yellow / Orange → D9

✅ FULL ARDUINO CODE

(Arduino Uno + Keyes LDR Module + Servo)

/*
  Project Name  : LDR Based Automatic Servo Control
  Sensor        : Keyes LDR / KY-018 Photosensitive Module
  Board         : Arduino Uno
  Output        : Servo Motor
  Created By   : Anubhav Projects Lab
*/

#include <Servo.h>

Servo myServo;

// Pin configuration
int ldrPin   = A0;   // LDR Signal pin (S)
int servoPin = 9;    // Servo signal pin

// Light threshold (adjust as per environment)
int threshold = 700;

void setup() {
  Serial.begin(9600);

  myServo.attach(servoPin);
  myServo.write(0);   // Servo OFF position

  Serial.println("Anubhav Projects Lab");
  Serial.println("LDR Servo Control Project Started");
}

void loop() {
  int ldrValue = analogRead(ldrPin);   // Read LDR value

  Serial.print("LDR Value: ");
  Serial.println(ldrValue);

  // Condition for high light
  if (ldrValue > threshold) {
    myServo.write(90);   // Tez light → Servo ON
  } else {
    myServo.write(0);    // Low light → Servo OFF
  }

  delay(200);
}

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