Arduino Uno R3 Board Atmega328P CH340 Arduino Uno compatible. This board has the SMD version of the Atmega chip and the CH340 USN chip. It uses the standaard Arduino Uno bootloader and is fully compatible. I am selling this board because I use it a lot to build chip testers. I also use it as a programmer for Atmel chips. I have various test, protoype and program shields in my webshop for the Arduino Uno. https://www.heinpragt.nl/?product=prototype-pcb-for-arduino-uno https://www.heinpragt.nl/?product=experimenteer-print-voor-arduino-uno https://www.heinpragt.nl/?product=isp-shield-programmer-for-atmega-attiny-pcb https://www.heinpragt.nl/?product=mightycore-programmer-shield-pcb https://www.heinpragt.nl/?product=mightycore-programmer-shield-pcb https://www.heinpragt.nl/?product=atmega328p-standalone-pcb https://www.heinpragt.nl/?product=atmega328p-pu