Abstract

The aim of this project is to build an electronic device that makes use of the law of light reflection, to detect the simple colours of an object. A common anode LED produces light of a certain colour in the direction of an object. The object receives light and reflects it towards a phototransistor. The colour of the object can be recognized using the voltage difference this light produced between the collector and the emitter of the phototransistor detected, and the result will be displayed on the LCD display.