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Arduino Uno R3 is a specific version of the popular Arduino Uno board. The "R3" (Revision 3) refers to a specific hardware revision that brought some improvements over previous versions of the Uno. It is widely used for various electronics projects, especially for beginners, because of its simplicity and compatibility with a wide range of shields and modules.
Digital I / O Digital input / output, a total of 0 ~ 13.
Analog I / O Analog input / output, a total of 0 ~ 5.
Support the ISP download function.
The input voltage: when connected to the computer USB without external power supply, external power supply 5V ~ 9V DC voltage input.
Output voltage: 5 V dc output voltage and 3.3 V dc output voltage.
Using Atmel Atmega328 microprocessor controller
Controller: ATmega328P-AU USB to serial
Chip: CH340G
Input Voltage (recommended): 7-12V
Digital IO pins: 14 (of which 6 provide PWM output)
Analog input pins: 6 DC
Current per I/O Pin: 40 mA
USB Port: type B USB
Clock Speed: 16 MHz
Operating voltage: 5V
Input Voltage (limits): 6-20V
