There is no need to change the Arduino nano to obtain +3.3V levels on the I2C signals. If you have both 5V and 3.3V I2C busses a level translator can be used. For a single signal the level translator consists of a MOSFET, such as a BSS138.

SOurce to the low level side, drain to the high level side, gate on +3.3V. Scientist Meets The Roots Radics Rar. The best results can be obtained if the transistor is bridged by a schottky diode (e.g.

BAT54), drain to cathode, source to anode. Both sides should have a pull-up resistor, the drain to +5V, the source to +3.3V. The two resistors should not present a load above 3mA! If these resistors are called Rs(ource) and Rd(rain) then 5V/Rd + 3.3V/Rs. Very nice tutorial. I alays wondered why nobody produced a 3V3 Nano! To some commenters, the idea here is to make all I/Os (and also VRef/ADCs etc) work at 3V3, even if there is some Vin or VUSB present!

Arduino as a serial adaptor. Lynn Hagen-brac Village 20-claimed By A Cougar there. Arduino Duemilanove In 3.3V. Since most of the JTAG pins on embedded routers are at 3.3v, you can use the Arduino Duemilanove to. The Arduino Software (IDE) includes a serial monitor which allows simple. For the Uno and the older Diecimila or Duemilanove Arduino. The second one.

That can’t be done without HW modifications. FYI, overclocking at 16MHz has been done by JeeLabs for years without any report of problems. Note also that MCP regulators only accepts voltages up to 6V. That’s OK for USB, but the nano original specs states that Vin can accept 7V to 12V (or even 6V to 20V).