12v LED Matrix/7seg driver with Bluetooth

Design by: 4671

Based on the circuit: http://embedded-lab.com/blog/?p=7628 But with stacked ULN2803's for 1A per column This is for me to use with a few 1m x 1m panels with ebay LED modules spaced on a 140mm grid (: Big displays, draws about 800mA for a full column (All pixels on) Onboard MAX7219 and ATmega328. Hardware serial of the '328 is wired to a HC05 bluetooth with level shifting and the Make magazine Bluetooth Programming circuit to do autoreset (allows updating the advertisement display over bluetooth) (See http://makezine.com/projects/diy-arduino-bluetooth-programming-shield/)