1、Control board is an AT as core micro‑controller development board itself has 54 digital I/O input/output terminals (14 can be used as PWM outputs), 16 simulation than the input side, group 4 UARTs (hardware serial ports), 16 MHz crystal 2、Connect board to computer with USB cable, or power it with a power adapter or battery, then the board could work 3、RAMPS 1.4 board is designed to fit the entire electronics needed for a reprap in one small package for low cost. RAMPS interfaces an mega with the powerful Mega platform and has plenty room for expansion. The modular design includes plug in stepper drive 4、This full graphic smart LCD 12864 controller contains a SD‑Card reader, an rotary encoder and a 128 x 64 dot matrix LCD display. You can easy connect it to your RAMPS board 5、After connecting this panel to your RAMPS, you don't need your pc any more. The smart controller supplies power for your SD card. Further more all actions like calibration, axes movements can be done by just using the rotary encoder on the smart controll