I am planning to build a clock / thermometer / info display. I have ordered 10 pieces of 8x8 LED matrixes from ebay (http://www.ebay.co.uk/itm/331064583297). As this is not a pre-built one I have got to design some sort of circuit which will be able to do the trick.
- The commercial ones work by segments, each 8x8 is one segment and you has to shift the code though each segment to get to the last one. (I would rather go this way as this requires more components.)
- My idea is to make it one big Matrix, not 8 smaller one. A TLC5940 or two 74hc595 would be able to control the lines and i would be able to controll this way the colls as well. (2 TLC5940 or 4 74hc595). (Or 5 74hc595-s and make it 16x40)
So I think I have got this part figured (maybe not share your ideas), but how am I going to display text on these pixels? How am I going to produce the "image" (the array), which should be shifted out? (Not to mention running text, animations, etc..) I am not quite sure how this is going to work.
Oh and the Arduino can be any type, I prefer the MEGA2560 so we don't have to worry about the program size. And I will be able to hook up my RTC, Ethernet Module, Temp sensors, buttons, etc...
Every bit of info is a plus on this. The displays will arrive in 3-4 weeks so it would be nice to have this figured by the time they arrive.