2. PIN ASSIGNMENT
7 to 12 VDC
input
2.1 x 5.5 mm
Male center
positive
Not connected
I/O reference
Voltage
RESET
3.3V Output
5V Output
Ground
Ground
Input voltage
Analog Input 0
Analog Input 1
Analog Input 2
Analog Input 3
(I
2
C)SDA
(I
2
C)SCL
ATmega328
Mikrocontroller IC
GND
MOSI
VCC
ICSP for
ATmega328
RXD
TXD
Interrupt 2
Interrupt 1
(SPI)SS
(SPI)MOSI
(SPI)MISO
(SPI)SCK
(I
2
C)SDA
(I
2
C)SCL
Reset button
USB-B port
to computer
ATmega16U2
Microcontroller IC/USB Controller
16MHz
crystal
Voltage
regulator
SCK
RESET
MISO
Pin-13 LED
ICSP for USB
interface
