smollda

As for contacts, these fit pretty well https://www.tme.eu/en/details/7.010.901.001/m23-connectors/hummel/

I found this : "Atmega328P Datasheet 19.5.2, 19.5.2 SPSR - SPI Status Register Bit 0 - SPI2X: Double SPI Speed Bit When this bit is written logic one the SPI...

I've also found this https://flytron.com/multicopter-parts/116-3v-16mhz-pro-mini-with-100-arduino-compatibility-.html , but it's a bit too expensive (for what it is). I've had arduino nano, level shifter and PCB prototype board lying around, so I'll...

Hi, thanks for the quick response! After some testing today I can say your "noise" theory is probably true. I made second testing circuit with different arduino and different level...