🛠️ MAKER GUIDEJul 03, 2026•⏱️ 2 min read•🇳🇵 Tested in Nepal
Autonomous Obstacle Avoidance Robot Car with HC-SR04 and L298N
Build a smart obstacle-navigating autonomous robot car using the Smart Car Chassis, SG90 servo scanning, and L298N H-Bridge motor driver.
🛠️ BILL OF MATERIALS (BOM)
Required Hardware & Component Checklist
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Estimated Total (7/7 items):
NPR 3,800
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NPR 1,300
NPR 350
NPR 250
NPR 200
NPR 1,200
NPR 100
NPR 400
(NPR 200 ea)
Autonomous Obstacle Avoidance Robot Car with HC-SR04 and L298N
Build a 4WD autonomous robot car using the HC-SR04 Ultrasonic Sensor, SG90 Servo, and L298N Motor Driver.
Hardware Bill of Materials:
- Microcontroller: UNO R3 ATMEGA328P-PU Development Board with 30cm cable
- Motor Driver: L298N Dual H Bridge DC Stepper Motor Drive Controller Board Module
- Sensor: HC-SR04 ultrasonic sensor / ultrasonic range / ultrasonic module
- Pan Servo: SG90 9g Micro Servo Motor 180 Degree
- Chassis & Power: Smart Robot Car Chassis Kit + 18650 Battery Box 2S + 2x 18650 3.7V 3000mAh Battery
Circuit Pinout & Wiring Connections:
| Component / Module Pin | Arduino Uno Pin | Function / Description |
|---|---|---|
| L298N IN1 / IN2 | Pin D4 / Pin D5 | Left Motors Forward / Reverse |
| L298N IN3 / IN4 | Pin D6 / Pin D7 | Right Motors Forward / Reverse |
| L298N ENA / ENB | Pin D3 / Pin D11 (PWM) | Left / Right Motor Speed Regulation |
| SG90 Servo PWM | Pin D9 | Sonar Pan Scanning (0° - 180°) |
| HC-SR04 TRIG / ECHO | Pin D8 / Pin D2 | Ultrasonic Range Sensing |
| 18650 2S Battery (+7.4V/GND) | L298N 12V In & Arduino VIN | High Current Drive Supply |
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