1pcs For Uno R3 Official Box Atmega16u2 + Mega328p Chip For Arduino Uno R3 Development Board + Usb Cable In Stock Annuosenchip - Integrated Circuits - AliExpress
ARDUINO UNO The Arduino uno is a microcontroller board based on the ATmega328. It has 14 digital Input / Output pins (of which 6 can be used as PWM outputs), - ppt download
Arduino for Beginners
Arduino Uno Overview | PDF | Arduino | Office Equipment