Quantity   Component name
1 × ESP32 DevKit V1 Main controller — 30-pin
1 × ESP32-CAM AI Thinker OV2640, WiFi stream only
2 × MQ9 Gas Sensor Module CO on 3.3V, LPG on 5V
2 × HC-SR04 Ultrasonic Sensor Front + rear obstacle detection
2 × IR Sensor Module Left + right wall following
1 × L298N Motor Driver Dual H-bridge
2 × TT DC Gear Motor Left + right wheels
1 × Active Buzzer 5V Active LOW on GPIO4
1 × MPU6050 IMU GY-521 I2C orientation tracking
2 × 2S LiPo Battery 7.4V Separate motor + logic supply
1 × Breadboard PSU Module 5V + 3.3V rails
1 × Acrylic 2WD Chassis Robot base frame