This document describes an Android based coloured line follower robot. It consists of line sensors to detect different coloured lines, an obstacle sensor to detect obstacles using infrared, a comparator to compare sensor voltages, an RFID reader to detect tags, and a motor driver IC to control the motors. The robot can be controlled via an Android device using Bluetooth and avoids obstacles while following the desired coloured line to its destination. It has applications in factories, warehouses, and libraries.