Compatible Arduino UNO R3 SMD - CH340

The Compatible Arduino UNO R3 SMD - CH340 is functionally identical to the the latest version of the extremely popular and easy-to-use open source Arduino Uno. The Arduino Uno R3 uses the ATmega328 microcontroller and features 14 digital I/O pins (6 may be used as PWM outputs) and 6 analog input pins. The Arduino Uno R3 can be powered through a USB connection, battery, or a wall power adaptor.

The Uno differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. Instead, it features the Atmega16U2 (Atmega8U2 up to version R2) programmed as a USB-to-serial converter.

The ATmega328 has 32 KB (with 0.5 KB occupied by the bootloader). It also has 2 KB of SRAM and 1 KB of EEPROM (which can be read and written with the EEPROM library).

Revision 2 of the Uno board has a resistor pulling the 8U2 HWB line to ground, making it easier to put into DFU mode.

Revision 3 of the board has the following new features:

• 1.0 pinout: added SDA and SCL pins that are near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board. In future, shields will be compatible with both the board that uses the AVR, which operates with 5V and with the Arduino Due that operates with 3.3V. The second one is a not connected pin, that is reserved for future purposes.
• Stronger RESET circuit.
• Atmega 16U2 replace the 8U2.

NOTES

• This is not the original board of Arduino Uno. For Original Board Click here