Any specific reason you see 10 as a limit?
I didn't change any of your parts or circuitry, but I did add an adapter board with 3 x 10K resistors on it. They go between DI, CLK and CS to ground. When the Arduino starts up or I reset it, the matrix doesn't flash up briefly before displaying. One thing I have noticed is that some modules show junk at start up (and it never goes away). If I rearrange the modules (reposition the module that shows junk) they all still work. Just a case of finding a position it works at. I suspect it's the 7219's that might be getting through the QA check a little too fast...
If anyone finds the solution to the 'junk' being displayed, please let us all know...
I ordered some Parola PCB's from SeeedStudio, got the parts and LED 8x8's and built up 20 boards. Built them up like Lego's and they worked first time.
Nice one Mel,I really do like the wood-grain case. I'll give your idea of cycling the power manually on my 20-array tonight. If that works I have some logic-level MOSFETs somewhere so will make up a standalone board with the ATMega and MOSFET to drive that.Thanks for sharing your experiences,Geoff
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