Arduino Uno R3

Arduino Uno R3 Compatible

Arduino Uno R3 is a microcontroller board based on the ATmega328P. It features 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header, and reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with an AC-to-DC adapter or battery to get started. Due to the low-cost, you can tinker with your UNO without worrying too much about doing something wrong.

We offer two versions of the Arduino UNO R3 compatible devices. One is a replica of the original UNO R3 (see UNO R3 with ATmega16U2), which does not require any extra drivers. The other unit (see UNO R3 with CH340) has the same functionality but uses a CH340 UART for the USB interface and is less expensive.
See our complete line of Arduino-compatible devices.

Specifications

Microcontroller: ATmega328P
Operating Voltage: 5V
Input Voltage (Recommended): 7-12V
Power 5V: Provided through USB Type-B Port  
Power External: Through 2.1mm barrel jack (7v to 12v DC)
Digital I/O Pins: 14 (of which 6 provide PWM output)
Digital I/O: 5v Logic Levels
PWM Digital I/O Pins: 6
Analog Input Pins: 6
ISP Programming: Available through TX/RX ports
DC Current per I/O Pin: 20 mA
DC Current for 3.3V Pin: 50 mA
Flash Memory: 32 KB
SRAM: 2 KB
EEPROM: 1KB
Clock Speed: 16 Mhz Oscillator

Setup and Configuration

For USB communications, a separate driver may be required by your system, although most modern operating systems proactively install it.

Having trouble with the CH340 driver?

• There is a very good video (available on YouTube) which goes into detail on setting up the correct working driver. The companion website, also has detailed instructions. The version 3.5.2019.1 can be downloaded from here
  • Legacy Details
    • See these video instructions
    • You can download an earlier version of the driver for Windows that we know works well. Available as a .EXE file of .ZIP file
      • The WCH Official support site has the most recent driver (see https://www.wch.cn/download/CH341SER_ZIP.html), but DOES NOT WORK with Windows 10 or 11. You must use a legacy/earlier version (v3.5.2019.1 works and is the preferred version)

Arduino Uno R3 Pinouts

Connectivity

The Arduino Uno R3 features a USB Type B connector for programming, power, and application monitoring for connection to a host computer. A USB cable is available separately should you require it. The cable is available as a USB Type A/B or USB Type B/C or Type B/C Right.