Oh yes of course, the MCU is programable, so the LVC setting will have been set to take account the drop.
I went and grabbed the Atmel ATtiny13 pinout and went to Dr.Jomes page about his firmware and slave board wiring. I got my head around things a bit better now.
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Look in on JohnnyC’s STAR firmware, you can tweak the level it goes into it’s low voltage mode…you would have to test it out w/o the diode set it from the stock 130 to say 120 or lower or something then compile but it is adjustable