Make a rover that stops or turns before hitting walls

Steps

1. Mount ultrasonic sensor facing forward; keep wiring short to reduce noise.
2. On 3.3V MCUs, level-shift or divider the 5V ECHO line before GPIO.
3. Drive motors via L298N/L293-class driver with a separate motor supply if needed.
4. Filter distance readings (median of 3) before deciding turn direction.

Kits & catalog links

Start from project kits matching “obstacle”, then fill gaps from parts.

Safety

• HC-SR04 ECHO is typically 5V — protect 3.3V inputs.
• Isolate noisy motor grounds carefully; share GND with logic.

Assumptions

• Pin maps differ by board; use Compatibility Checker for known parts.