Arduino Uno R3 is based on AVR atmega 328 microcontroller and comes in removable DIP package, It has 20 digital input/output pins (of which 6 can be used as PWM outputs and 6 can be used as analog inputs). Programs can be uploaded directly from Arduino IDE through USB port.
- Atmega328-PU Microcontroller
- 14 Digital Pins
- 6 Analog Pins
- 6PWM outputs via PWM pins
The Uno R3 differs from all previous boards in that it does not use the FTDI USB-to-serial driver chip. Instead, it features an ATmega16U2 programmed as a USB-to-serial converter. This microcontroller has its own bootloader allowing Advanced users to program it.