Review on KOOKYE Nano V3.0 ATMEGA328P Module CH340C 5V 16M Mini USB Micro-Controller Board for Arduino (Nano5) - Enhanced Performance and Connectivity by Mike Newbill

They seem to work well enough, so far I've only configured one with TMK keyboard firmware to enable the PS/2 to USB adapter. It's interesting to note that while grounding and resetting the pins works fine for the second one, once I've flashed some firmware on it, it doesn't seem to work with the original firmware. Maybe it has something to do with avrdude, but I had to hold the reset and contacts together for a good two or three seconds to actually get anything to blink. For those interested, I used this command: avrdude -c avr109 -p atmega32u4 -P $SERIAL_PORT -U flash:w:$HEX_FILE where $SERIAL_PORT is the serial port device on your system, e.g. COMX on Windows /dev/ttyAMCX on Linux , where X is usually a number.