Arduino Yun


Arduino Yun Front View


Processor: ATmega32u4 (8-bit, 16MHz, 2.5KB RAM, 32KB Flash) and Atheros AR9331 (MIPS @400MHz, 64MB DDR2, 16MB Flash)
Features: Ethernet and WiFi, USB-A port, micro-SD card slot, 20 digital I/O pins, a micro USB connection

POWER header:
NameFunction
-Not connected
IOREFLogic Reference (5V)
RESETRESET pin
3.3V3.3V
5V5V
GNDGround
GND
VinInput voltage (External power)

ANALOG header:
NameMCU pinFunction
14 (A0)PF7 (36)ADC7/TDI
15 (A1)PF6 (37)ADC6/TDO
16 (A2)PF5 (38)ADC5/TMS
17 (A3)PF4 (39)ADC4/TCK
18 (A4)PF1 (40)ADC1
19 (A5)PF0 (41)ADC0

DIGITAL header:
NameMCU pinFunction
0PD2 (20)INT2/RXD1/RX
1PD3 (21)INT3/TXD1/TX
2PD1 (19)INT1/SDA
3PD0 (18)INT0/OC0B/SCL (PWM)
4 (A6)PD4 (25)ICP1/ADC8
5PC6 (31)OC3A/OC4A (PWM)
6 (A7)PD7 (27)OC4D/ADC10/TO (PWM)
7PE6 (1)INT6/AIN0/HANDSHAKE
8 (A8)PB4 (28)ADC11/PCINT4
9 (A9)PB5 (29)OC1A/ADC12/PCINT5/OC4B (PWM)
10 (A10)PB6 (30)OC1B/ADC13/PCINT6/OC4B (PWM)
11PB7 (12)OC0A/OC1C/PCINT7/RTS (PWM)
12 (A11)PD6 (26)OC4D/ADC9/T1 (PWM)
13PC7 (32)OC4A/ICP3/CLKO (PWM)(LED)
GNDGround
AREFAREF (42)Analog Ref.
18PD1 (19)SDA/INT1
19PD0 (18)SCL/INT0/OC0B (PWM)

ICSP header:
NameMCU pinFunction
1PB3 (11)MISO/PCINT3/PDO
2 VCC (5 V)
3PB1 (9)SCK/PCINT1
4PB2 (10)MOSI/PCINT2/PDI
5RESET (13)RESET
6Ground

Notes:
OCxA/OCxB/OCxC/OCxF can be used for PWM output.
Absolute max current per pin is 40 mA (20 mA recommended).
Absolute max current for the entire package is 200 mA.