Keyestudio 4DOF Manual page 71

68
the AVR, an Arduino micro-program header
consisting of MOSI, MISO, SCK, RESET,
ICSP
VCC, and GND.
(In-Circuit
It is often called the SPI (serial peripheral
interface) and can be considered an
Serial
1
"extension" of the output. In fact, slave the
Programmi
output devices to the SPI bus host.
When connecting to PC, program the
ng) Header
firmware to ATMEGA328P-PU.
Powering the Arduino, LED on means that
Power LED
2 your circuit board is correctly powered on.
Indicator
If LED is off, connection is wrong.