The table below shows hows the pins of the Arno microcontroller are attached to the different components on the board.

Pin

---

1

2

3

4

5

6

7

8

9

10

11

12 / A11

13

14

15

16

17

18/A0

19/A1

A2

Element

---

SW1

--

--

SW2

irLED

LED2

LED3

LED4

redLED

greenLED

blueLED

piezo

LED1

--

--

--

--

POT1

photoTran

SW1

Description

---

Push Button Switch 1

I2C SDA

I2C SCL

Push Button Switch 2

Infrared LED

Single LED

Single LED

Single LED

RGBD LED red channel

RGBD LED green channel

RGBD LED blue channel

RGBD LED red channel

Single LED

MISO

SCLK

MOSI

SS

Thumbweel Potentiometer

Phototransistor

Push Button Switch 1 (shield version)