It is a simple land moving bot made out of basically a proximity sensor by lm324n (IR led and photodiode ) and motor driver IC, controlled by an Arduino nano (breadboard friendly) . It runs away from you as soon as it sense any object in range of the proximity sensor( yes the same proximity sensor used in your phone )
Step 1: Getting the Components Together
It's easy to get all parts
You can get those from ebay or any local electronics shop.
Step 2: Connecting Up Things As the Circuit Diagrams
Connect as the given the diagram. It's self-explanatory.
Step 3: Uploading Your Sketches Into the Arduino Nano
Just put in the sketch in the Arduino IDE and upload it and you're done. It should work fine, you should calibrate the range of the proximity sensor using the potentiometer and you are good to go.