ATMega2560 development board, full IO lead (including Arduino unused IO),

onboard USB-UART conversion (CH340C), can be used as a general Arduino 2560.

On the back of the board, the corresponding pin definitions in the Arduino are marked (x means that Arduinio is not used),

as well as a comparison table of some communication interfaces.

There are four LEDs on the board:

One is the power indicator;

Two are UART0 (PE0, PE1) indicator lights;

One is the Arduino ancestor 13-pin (PB7) "L" light.

There are three jumpers on the board (0603 0 ohms):

Two are UART0 (PE0, PE1) of MCU to CH340;

One is +5V to AVCC.

Just connect it all.

There are two optional resistors on the board:

The pull-up resistor of IIC interface (PD0, PD1) is generally not connected.

I added IIC completely because I personally prefer IIC and I use IIC for everything.