This is a little cool stuff. I intended to build a hex keypad display. Unfortunately, I was not able to have a hex keypad available on our local shop(for those who don't know, I'm in the Philippines). You want the schematic? just send me out an email or use any search engine but I prefer using google. Always make sure that before soldering any component into the Universal PCB, lay it out on a bread board first. Good Luck!