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The Advanced Motorized Solar Scarecrow for Effective Repellent Project


In the realm of agriculture, protecting crops from birds and animals is a critical yet challenging task. The Motorized Solar Scarecrow Bird Animal Repellent offers a modern solution to this age-old problem. Utilizing solar power for energy, this system is designed to detect, deter, and protect crops from avian species and animals that pose a threat to agricultural productivity.

Understanding the Menace

Birds and animals can severely impact crop yields during various stages of growth. The damage they cause is not just limited to the physical destruction of plants but also extends to economic losses for farmers. Traditional scarecrows have been used for centuries but have lost effectiveness as birds adapt and recognize these static figures as harmless.

How the Motorized Solar Scarecrow Works

  • Sound Detection: The system includes a microphone that constantly monitors environmental noise levels. Upon detecting a spike indicative of bird or animal presence, the scarecrow is activated.
  • Dynamic Human-like Movements: Powered by a DC motor, the scarecrow’s arms move in a human-like motion, deterring birds and animals more effectively than static models.
  • Alarming Sounds: Alongside movement, a speaker module emits noises to further scare away potential crop threats.
  • Solar-Powered Efficiency: Equipped with solar panels and a battery, the scarecrow harnesses solar energy, making it self-sufficient and environmentally friendly.

Components of the System

  • Arduino Uno: Serves as the brain of the system, controlling all actions.
  • DC Motor & Gear Mechanism: Drives the arm movements.
  • Solar Panels & Battery: Powers the system sustainably.
  • Mic Module: Detects sounds indicating bird or animal presence.
  • Speaker Module: Emits alarming sounds to scare away pests.
  • Structural Components: Includes poles, mounts, linkage arms, and frames for physical support.


  • Effectiveness: More effective than traditional scarecrows due to dynamic movement and sound.
  • Eco-Friendly: Solar-powered, reducing carbon footprint and eliminating the need for external power sources.
  • Longevity: Durable and designed to withstand various weather conditions.
  • Autonomy: Requires minimal human intervention once installed.


The Motorized Solar Scarecrow represents a leap forward in agricultural technology, offering farmers a reliable, efficient, and sustainable method to protect their crops from birds and animals. By combining sound detection, dynamic movement, and solar power, this innovative system stands as a guardian of agricultural productivity.

Sample Code

Components Needed:

  • Arduino Uno
  • DC Motor
  • Solar Panel and Battery Setup
  • Microphone Module (e.g., Sound Detection Sensor)
  • Speaker Module or Piezo Buzzer
  • Motor Driver (e.g., L298N to control the DC motor)
  • Various resistors, capacitors, and possibly a transistor for controlling the speaker
  • Breadboard and connecting wires
#include <Servo.h>

// Constants and variables
const int micPin = A0;  // Microphone connected to analog pin A0
const int motorPin = 3; // DC Motor connected via Motor Driver to pin 3
const int speakerPin = 9; // Speaker or buzzer pin
int soundThreshold = 500; // Threshold value to trigger scare actions

Servo scarecrowArm;  // Create servo object to control the scarecrow's arm

void setup() {
  scarecrowArm.attach(motorPin);  // Attaches the servo on motorPin to the servo object
  pinMode(micPin, INPUT);
  pinMode(speakerPin, OUTPUT);
  Serial.begin(9600);  // Start serial communication at 9600bps

void loop() {
  int soundValue = analogRead(micPin);  // Read the sound level
  Serial.println(soundValue);  // Print sound value to serial (for debugging)

  if(soundValue > soundThreshold) {
    scareBirds();  // Function to scare birds

  delay(100);  // Short delay between reads for stability

void scareBirds() {
  // Move scarecrow arms to mimic human movement
  for(int pos = 0; pos <= 180; pos += 1) { 
    scarecrowArm.write(pos); // Goes from 0 degrees to 180 degrees
  for(int pos = 180; pos >= 0; pos -= 1) {
    scarecrowArm.write(pos); // Goes from 180 degrees back to 0 degrees

  // Emit a scaring sound
  tone(speakerPin, 1000, 200); // Send 1KHz sound signal for 200 ms
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