I received a question regarding "power supply" of ULTRA. Actually this point should be noted before. Thanks.
(Case: USB cable connected)
ATMega1284P in ULTRA is working at 3.3V by FTDI embedded 3.3V voltage regulator
(Case: USB de-touched)
We should apply 3.3V between VC/GN terminal on ULTRA
Anyway, ULTRA is 3.3V system. Have fun!
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