I've had one of these http://www.alselectro.com/7-segment-led-array---key---ic-tm1638-drive.html
for a while and when I tried to use it had trouble getting anything to display. So I played with it and looked for some example SPIN code to use with it but only found a couple online that didn't work for me anyway. More playing and things started to click. So I've written a few simple programs to use the basic display options and thought I would post this to help someone else trying to get started. Also included a readme with some of what I have learned. I have nowhere near learned to use this to even part of it's potential and may post more when more is known. Hope this helps someone!