Finding 3.3V compatible Arduino boards is bit more difficult than the good old Uno or Mega.
There is a nice overview of all Arduino boards with their features including the input/output voltage.
The boards that make most sense are the Due and the Zero.
The latter is no longer produced but there is a nice alternative from a company called Protoneer
This board is pin and SW compatible with the original Arduino mini
The cheapest option of all 3v3 boards is the SMT32 Blue Pill board (lowest price I found was 1.76$ with free shipping)? but that requires a rather complex installation of the STM development environment inside the Arduino IDE.
A bit easier to use should be the version of the Blue pill with the Arduino bootloader already preloaded (can be found below 4$)? which is called the "Maple mini". I did not test this myself.
--
HBTE Files section:?
/g/HBTE/filesErik, PD0EK
