1.Arduino Mega 2560 Arduino Mega an ATmega2560 as core microcontroller development board itself has 54 groups digital I / O terminal (14 groups do PWM outputs) 16 sets of simulation than the input side group 4 UARTs (hardware serial ports) using the 16MHz crystal oscillator. With the bootloader download the program directly via USB without having to go through other external writer. Supply part of the optional USB power or as an external power using the AC-to-DC adapter and battery. Arduino development IDE interface is based on open-source principles allows you to free download for use in project work school teaching motor control interactive works. 2.RAMPS 1.4 extend Shield It is a Mega Pololu Shield or RAMPS for shortdesigned to fit the entire electronics needed for a RepRap in one small package for low cost. RAMPS interfaces an Arduino Mega with the powerful Arduino MEGA platform and has plenty room for expansion. The modular design includes plug in stepper drivers and extruder control electronics on an Arduino MEGA shield for easy service part replacement upgrade-ability and expansion. Additionally a number of Arduino expansion boards can be added to the system as long as the main RAMPS board is kept to the top of the stack. This board is mostly based on Adrian's Pololu_Electronics and work by Tonok. Copper etch resists methods suggested by Vik. Also inspired by Vik's work with EasyDrivers. circuit design based mostly on Adrian's Pololu_Electronics Joaz at RepRapSource.com supplied initial pin definitions and many design improvements. Much inspiration suggestions and ideas from Prusajr Kliment Maxbots Rick and many others in the RepRap community. 3.A4988 driver This product is a carrier board or breakout board for Allegro's A4988 DMOS Microstepping Driver with Translator and Overcurrent Protection by Pololu; we therefore recommend careful reading of the A4988 datasheet before using this product. This stepper motor driver lets you control one bipolar stepper motor at up to 2A output current per coil.