The main difference in this clone of Arduino Uno R3 CH340 Chip, which is one of the standard boards of Arduino, is that the programming integrated (USB-Serial converter) used by Arduino Uno R3 CH340 is CH340. Although it has a few small differences from Arduino, there is no difference in terms of its use, software and compatibility of expansion boards. Arduino Uno

It is a microcontroller card based on Atmega328. It has 14 digital input/output pins (6 of which can be used as PWM outputs), 6 analog inputs, 16Mhz crystal, usb socket, power socket, ICSP connector and reset button. The card contains everything necessary for the operation of the microcontroller. It can be easily connected to the computer via a USB cable, and can be operated with an adapter or battery. Specifications Microcontroller: ATmega328P

Operation Voltage: 5V

Input Voltage (recommended): 7-12V

Input Voltage (limit): 6-20V

Digital I/O Pins: 14 (6 of which are PWM outputs)

Analog Input Pins

Current per I/O: 40 mA

Current for 3.3V Output: 50 mA

Flash Memory: 32 KB (ATmega328) 0.5 KB bootloader

SRAM: 2 KB (ATmega328)

EEPROM: 1 KB (ATmega328)

Clock Speed 16 MHz

Length: 68.6 mm

Width: 53.4 mm

Weight: 25 g

Useful Links Arduino IDE (Software Development Platform)

Arduino Uno Official Page

Atmega328 Datasheet

Card Schematic