💣 Military Spying & Bomb Disposal Robot

Design a heavy-duty military crawler equipped with a wireless spy camera, metal detector, and a 4-DOF mechanical arm.

📋 Overview

Tactical defense robotics require high reliability and remote agility. This project constructs a bomb-disposal tracked crawler featuring a wireless camera feed, an analog metal detector sensor, and a 4-DOF robotic arm actuated remotely via a custom Android Bluetooth interface.

What you'll learn: Multi-servo torque calculation, SoftwareSerial packet parsing, H-bridge DC motor configurations on heavy-duty chassis, and integrating analog metal detection coils.

Estimated time: 8-10 hours. Difficulty: ⭐⭐⭐⭐⭐ Expert.

🧩 Components Needed

Component	Specification	Qty	Notes
Arduino Mega 2560	5V, 54 Digital I/O	1	Required for multiple serial & servo outputs
HC-05 Bluetooth Module	Serial transiever	1	Communicates with Android controller
L298N High-Power Driver	Dual H-Bridge	1	Drives crawler track DC motors
High-Torque Metal Servos	MG996R	4	Base, Shoulder, Elbow, Gripper joints
Wireless Camera Module	5.8GHz / ESP32-CAM	1	Streams video feed
Analog Metal Detector Coil	VLF Sensor	1	Detects buried metallic targets

📖 Step-by-Step Tutorial

Mechanical Assembly

Assemble the crawler chassis. Mount the 4-DOF robotic arm on the front base, aligning the heavy MG996R servos for optimized center of mass.

Servo & Motor Power Bus

Do NOT power the MG996R servos from the Mega. Wire a dedicated 6V 5A power supply to a shared ground bus to power all arm servos.

Wire Sensors & Bluetooth

Connect HC-05 to Serial1 RX1/TX1. Connect the analog metal detector module output to Pin A0.

Program Bluetooth Packet Parser

Write a parser that decodes incoming wireless packets (e.g., "S1:120,S2:90") to write angle commands directly to individual servos.

Integrate Metal Detection Alert

Write an interrupt trigger that immediately cuts motor power and sounds a high-frequency active buzzer when the metal detector coil parses a target.

💡

Ensure your mechanical linkages use metal brackets. Plastic horns will shear under the heavy holding torque of MG996R servos when lifting payloads.

💻 Code / Configuration

bomb_disposal.ino

INO

// Military Bomb Disposal Robot - Volt X
#include <Servo.h>

Servo jointBase, jointShoulder, jointElbow, jointGripper;
const int metalSensorPin = A0;
const int buzzerPin = 38;

void setup() {
  Serial.begin(9600);   // USB Debug
  Serial1.begin(9600);  // HC-05 Bluetooth
  
  jointBase.attach(8);
  jointShoulder.attach(9);
  jointElbow.attach(10);
  jointGripper.attach(11);
  
  pinMode(metalSensorPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  // Check for metal targets
  int metalVal = analogRead(metalSensorPin);
  if (metalVal > 800) {
    digitalWrite(buzzerPin, HIGH);

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