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Form Factor

We have the circuitry designed and are about to build a prototype. Our original design was from scratch using a Z80, but doing everything from scratch was going to make the unit way too expensive to build, so we've taken a different direction now. We are instead making a shield for Arduino Mega 2560 and using existing cheaply available modules to buld the system. For example a real-time clock board that is only about $7 and an optoisolated 8 relay board for


This is the current PCB layout we are working on. (Note: this is not final and there is plenty of time to get in feature requests, etc.) or without traces so you can see the components better:
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