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chipKIT Basic I/O Shield Reference Manual
4) J3 – Analog Signal Connector
Pin 1 (analog signal A0) is connected to a potentiometer. Pins 5 and 6 (labeled as A4 and
A5) provide access to the I 2 C signals SDA and SCL for the I 2 C bus. The I 2 C bus is used to
access the temperature sensor and the EEPROM and for the I 2 C daisy chain connector.
Note: On the Uno32 it is necessary to set jumpers JP6 & JP7 to the correct position for
accessing the I 2 C signals on that board. On the Max32 board, it is necessary to use jumper
wires to bring the I 2 C signals onto the board, as the connector providing the I 2 C bus on the
Max32 board doesn’t contact the Basic I/O Shield.
5) Discrete LEDs
Eight LEDs that provide discrete digital outputs. These can be accessed individually using
the digitalWrite function. The LEDs are connected to the low eight bits of microcontroller
PORTE and all eight can be written at the same time by writing to PORTE.
6) IC2 – Temperature Sensor
This is a Microchip TCN75A digital temperature sensor. It is accessed via the I 2 C bus.
7) JP2/JP3 – I 2 C Pull-up Resistor Enable Jumpers
These jumpers are used to enable or disable the presence of the I 2 C pull-up resistors on
the I 2 C bus. Having the shorting blocks installed enables the resistors. Removing the
shorting blocks disables them.
8) J11 – I 2 C Daisy Chain Connector
This is a 2x4 pin header connector that provides access to the I 2 C signals SDA and SCL
as well as power from the 3.3V power bus and ground. This can be used to extend the I 2 C
bus off of the board and to power external I 2 C device. Digilent has cables and a selection
of I 2 C peripheral modules that can be accessed using this connector.
9) Potentiometer
This is a 10K ohm potentiometer connected across VCC3V3 and ground. It provides an
analog input voltage to analog input A0.
10) J1 and J2 – Digital Signal Connectors
These connectors bring digital signals from the chipKIT microcontroller board onto the
Basic I/O Shield board.
11) Organic LED Graphic Display
This is a 128x32 pixel monochrome OLED graphic display panel. This display panel is
accessed using the SPI interface.
12) J9 & J10 – Digital I/O Signal Connectors
These are screw terminal connectors that provide access to digital I/O signals 3, 5, 6, and
9. These are four of the PWM signals from the chipKIT microcontroller board.
13) J6 – Open Drain FET Power Connector
This provides access to the power connections for the open drain FETs.
14) , J7, & J8 – Open Drain FET Output
These provide access to the outputs of the open drain FETs.
www.digilentinc.com
page 3 of 15
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