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From Here to There (Smart EV Obstacle Avoidance Robot Car)

Source:

Build a 2WD electric vehicle (EV) robot car fitted with an HC-SR04 ultrasonic distance sensor mounted on a servo steering neck. The car drives autonomously around obstacles while an OLED screen displays battery level.

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Props & Materials Required

  • •2WD robot car chassis with wheels & DC motors
  • •L298N / DRV8833 motor driver board
  • •HC-SR04 ultrasonic distance sensor
  • •SG90 micro servo motor (sensor radar pan neck)
  • •ESP32 / micro:bit V2 controller
  • •0.96-inch OLED display screen

Step-by-Step Instructions

1

Assemble EV Robot Chassis

Attach 2 DC gear motors, wheels, and front caster wheel to the chassis.

2

Mount Ultrasonic Radar Neck

Mount the ultrasonic distance sensor on top of an SG90 servo motor on the car front.

3

Switch ON Autonomous EV Mode

Turn on power switch. The car drives forward autonomously.

4

Obstacle Radar Scanning

When an obstacle is detected < 20cm, the car stops! Servo pans ultrasonic sensor Left and Right to scan for clear paths, then steers in the open direction!

Why It Works & Notes

Transport evolved from animal carts to steam engines, petrol cars, and now electric autonomous vehicles (EVs). Building an obstacle-avoidance robot car introduces autonomous driving technology hands-on.