Arduino UNO R3 - CH340
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Internal Reference: DEV-030-N

Arduino UNO R3 - CH340

The Arduino Uno R3 development board is a microcontroller board is mainly used for development and prototyping. It has 14 digital input/output pins (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 a reset button. It contains everything needed to support the microcontroller; connect it to a computer with a USB cable or power it with an AC-to-DC adapter or battery to get started. You can tinker with your Arduino UNO without worrying too much about doing something wrong. In the worst-case scenario, you can replace the chip and start over again. 

Technical specifications:

Operating Voltage5V
Input Voltage (recommended)7-12V
Input Voltage (limit)6-20V
Digital I/O Pins14 (of which 6 provide PWM output)
PWM Digital I/O Pins6
Analog Input Pins6
DC Current per I/O Pin20 mA
DC Current for 3.3V Pin50 mA
Flash Memory32 KB (ATmega328P)
of which 0.5 KB is used by the bootloader
SRAM2 KB (ATmega328P)
EEPROM1 KB (ATmega328P)
Clock Speed16 MHz
Length68.6 mm
Width53.4 mm
Weight25 g

Pin layout: