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A:
7 to 12VDC input
2.1mm x 5.5mm
Male center positive
B:
Voltage regulator
C:
16MHz crystal
D:
ATmega16U2
Microcontrller IC/USB Controller
E:
USB-B port to computer
F:
Reset button
G:
ICSP for USB interface
H:
(I2C) SCL-Serial clock
I:
(I2C) SCL-Serial data
J:
Pin-13 LED
K:
(SPI) SCK-Serial clock
L:
(SPI) MISO-Master-in , slave-out
M:
(SPI) MOSI-Master-out , slave-in
N:
(SPI) SS-Slave select
O:
Interrupt 1
P:
Interrupt 2
Q:
TXD
R:
RXD
S:
RESET
T:
SCK
U:
MISO
V:
VCC
W:
MOSI
X:
GND
Y:
ATmega328 microcontroller IC
Z:
ICSP for ATmega328
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