In one of my current projects, I used a few IR sensors, also known as Obstacle sensors. It can be great for Arduino projects, and can be bought really cheap from Amazon. we will see how we these ...

A DIY Robot comprised of two microcontrollers, namely the ESP32 and Arduino Nano; integrated with multiple sensors. An IR Sensor Array [TCRT5000] for Line Following, Ultrasonic Sensor for Obstacle ...