Same Problem, Zero IR Sensors

You've seen the beginner line follower — IR sensors on the bottom, reads black vs white, simple threshold. Now forget all of that.

This version uses a Raspberry Pi 4 and a Pi Camera. No IR sensors anywhere. Just a camera staring at the floor and a Python script doing maths 30 times per second.

Here's why this matters: lane detection in self-driving cars is exactly this algorithm, scaled up. Tesla's vision stack, Waymo's cameras, even the lane-keep assist in your parents' car — all doing some version of what you're about to build.

The core idea: grab a frame → convert to grayscale → threshold → find the line blob → measure how far it is from center → correct motors. Let's break each step apart.