Smallest LED cube bringing up the Big concepts in Microcontroller Timing cycles. It consists of 8 LEDs being controlled through microcontroller to give amazing lighting Effects.  A must try DIY project for beginners which can be extended to 4x4x4 or 8x8x8 and further, with 2x2x2 cube as the basic building block. The construction of LED cube is quite simple and easy to grasp. We have to construct two layers/rows of 4-LEDs in each. These two rows will then be connected together. To understand the working, let us consider that we want to ON an LED at position.  For this we send a HIGH at one Terminal of cube through a transistor (A transistor is used because current through microcontroller is not sufficient to drive more than 1-2 LEDs) and a LOW at C0 terminal. This makes a complete path for the current and LED glows.