This is a Reprap Melzi Ardentissimo full featured board using the ATMEGA1284P 16MHZ chip. This is a Sanguinololu firmware compatible board, need not the extra fan, hashing micro SD on board as well. A full firmware is on board as well negating the need for external stepper motor drivers.
This is a complete set of 3D printers electronic control board The main chip is ATmega1284P-AU (TWICE the memory of the inferior 644P!) 4x Stepper Motor Driver integrated chips are Allegro A4988 (Pololu) Integrated USB chip FT232RL socket Can control heatbed MK1, MK2a, MK2b, MK3 Integrated 3 MOSFET driver hot end, heatbed and fan Integrated G code file micro SD card socket
Working voltage: 12V Dimension: 210 x 50 x 17 mm Weight: 70g