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Thanks. Yes, I learned early on to do that. Every time I plug in the USB cable, I check the Windows Device Manager to see what port was just assigned. Then I select that port in the Arduino Tools/Serial Port menu.
Since the iDuino uploads without fail and the MPGuino doesn't, I suspect something wrong on the MPGuino. Could be a short but I suspect something messed up in the FTDI chip. I've read that the EEPROM in that chip can be corrupted. I'll have to search for a fix.
At least I have a workaround. It's a hassle to keep pulling the chip every time I want to update the code but it's doable.
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