SD Board pin features

Serial Options

• USB serial init: Serial.begin()
• On board serial1 pins 8rx, 9tx: Serial0.begin()
• On board serial2 pins 28rx, 29tx: Serial1.begin()

PRG Button

• PIN_BTN1 defined to access the PRG Button as pin 23
• To enable: pinMode(PIN_BTN1, INPUT);

On Board LED

• PIN_LED1 defined as pin 21
• To enable: pinMode(PIN_LED1, OUTPUT);

PWM Pins

• The Pins are 4,7,8,9,10

I2C

Pins 1 & 2 are the default I2C interface for the TwoWire (Wire.h) library.

• SDA1: 1
• SCL1: 2
• SDA2: 28
• SCL2: 29

The pins are 1,2 and 29,28

SPI

• The SPI pins are: 24, 25, 26, 27
• 24: SCK, 25: SDI(Serial Data In), 26: SDO (Serial Data Out), 27: SS NOTE (From the ChipKit Wiki):

SPI (default, spi.h uses this one) = DSPI0 = PIC32 HW SPI2

SPI Pin	SPI Label	Arduino Uno Pin
24	SCK, SCLK, CLK	13
25	SDI, MISO	11
26	SDO, MOSI	12
27	SS, CS	10

DSPI1 = PIC32 HW SPI3 (only on Fubarino v1.5)

SPI Pin	SPI Label
7	SCK, SCLK, CLK
8	SDI, MISO
9	SDO, MOSI
1	SS, CS

DSPI2 = PIC32 HW SPI4 (only on Fubarino v1.5)

SPI Pin	SPI Label
43	SCK, SCLK, CLK
28	SDI, MISO
29	SDO, MOSI
37	SS, CS

The SPI interface on AVR microcontrollers uses four signals labeled SS (slave select), MISO (master in/slave out), MOSI (master out/slave in) and SCK (serial clock). On AVR microcontrollers, MISO and MOSI switch direction depending on whether the SPI controller is enabled in master mode or slave mode.