The PJRC stuff is pretty good:
? ??
The ATMega328P normally runs on 5v in Arduinoland, but is also rated for 12mhz max
when run from 3.3v, this thread says does fine at 16mhz operating from 3.3v.
? ?
So if you take a cheap Nano clone and short across the LM1117-5 regulator, it should
just work when you feed it 3.3v at VIN.? ?
? ???? ??
Could still re-program using the USB port (powering from the host, so will then operate
the processor at 5v, have nothing attached to VIN), or could program it at 3.3v using
an external USB-to-UART-3.3v dongle into PD0,PD1 instead of the CH340.
If not planning to use the CH340, might remove the 1k resistors from TxD, RxD
to be sure it won't interfere.
?
Jerry
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On Tue, Jan 22, 2019 at 12:59 AM, <erik@...> wrote:
Due and Zero are clearly dead as a Dodo, any other 3.3Volt arduino compatibles?
