ATMEGA 16U2-MU
USB to serial chip, can convert the USB signal into serial port
signal.
Slide Switch
You can slide the switch to control the voltage of pin V (VCC), 3.3V
or 5V.
Voltage Regulator
To control the voltage provided to the board, as well as to stabilize
the DC voltage used by the processor and other components.
Convert an external input DC7-12V voltage into DC 5V, then
switch DC 5V to the processor and other components, output
DC 5V, drive current is 2A.
DC Power Jack
The board can be supplied with an external power DC7-12V from
the DC power jack.
IOREF
Used to configure the operating voltage of microcontrollers. Use
it less.
RESET Header
Connect an external button to reset the board. The function is the
same as reset button.
Pin 3V3 Output
Provides 3.3V voltage output
Pin 5V Output
Provides 5V voltage output
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