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Elegoo Nano

AVR microcontroller implementing Arduino Nano.

Same pin on the edge of the board as Arduino Nano, with (from left to right):

Front

Elegoo Nano Front

Port Mini USB: not directly plugged to the Atmega328P but rather to the chip at the back.

Atmega328P MCU: same as Arduino Nano.

Reset button: triggering a reset signal: connects the RST pin to GND while pressed.

Status LEDs: TX and RX for (USART? SPI?) data transmission, POW constantly on, and L blinking during a reset.

SPI port: 6 pins for SPI debugging (not mandatory if using USB),

Back

Elegoo Nano Back

AMS1117: voltage regulator.

CH340G: USB to UART signal converter.

Pins

The pins of the MCU are not numbered like the pins at the side of the board, even though most of the time, it is a plain wire in-between:

https://www.arduino.cc/en/Reference/Atmega168Hardware

Arduino Nano Pinout

Software