ICSP (In-Circuit Serial Programming) Header
ICSP is the AVR, an Arduino micro-program header consisting of
MOSI, MISO, SCK, RESET, VCC, and GND. It is often called the SPI
(serial peripheral interface) and can be considered an "extension"
of the output. In fact, slave the output devices under the SPI bus
host.
When connecting to PC, program the firmware to
ATMEGA328P-AU.
Serial Communication Pin
Connect to serial communication.
4Pins (GND, VCC (3.3V or 5V controlled by slide switch), RX, TX)
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