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Copyright © Parallax Inc.
Digital I/O Board Kit (#27113)
v1.0 2/19/2010 Page 1 of 13
Digital I/O Board Kit (#27113)
The Parallax Digital I/O Board Kit enables your microcontroller to interface to high voltage circuits
allowing you to read up to 8 optically isolated inputs and control up to 8 isolated outputs. Inputs can be
a voltage from 5-30VDC (AC compatible) and outputs can be either mechanical or solid state relays that
can switch up to 12A loads, such as cooling fans, solenoids, heating elements and more.
Simple parallel input/output control for ease of use or you can use the serial interface to minimize I/O pin
usage. The logic circuits operate from 3.3V to 5V making them compatible with most microcontrollers.
The ICs in the kit are all socketed making replacement easy should it ever be necessary. 8 green and 8
red LEDs indicate the status of input and outputs. 2 yellow LEDs indicate relay/logic power. Inputs can
be configured to handle a different range of input voltages by changing a couple of components.
Features
Mechanical or Solid State Relay output
Configurable Input Voltage range
Serial or parallel interface to inputs/outputs
LED indication of power and input/output status
AppMod compatible connection for Board of Education
Key Specifications
Power requirements: 12VDC @ 1A for relay power and 3.3 – 5VDC for logic power
Communication: Parallel or Synchronous Serial
Operating temperature: +32 to +158°F (0 to +70°C)
Dimensions: 7.25” L x 4.50” W x 1.00” H (184.1mm x 114.3mm x 25.4mm)
Application Ideas
Isolated power control of high voltage/current devices from your microcontroller, such as heating
elements, blower fans, solenoids, lighting systems and more
Isolated monitoring of high voltage signals such as doorbell, alarm or other signals.
Product Notices
Relays are not included with this kit and must be purchased separately. Mechanical Relays are
part #400-00052 and Solid State Relays are part #400-00053.
This product comes as a kit and must be assembled by the customer. Soldering experience is
required to assemble this kit and the following tools are required; Safety Glasses, Soldering Iron,
Solder, Flux (optional), Diagonal Cutters (to remove extra leads), Needle-Nosed Pliers (optional,
to bend/form leads)
This product is capable of switching high voltages. Observe the safety precautions listed in this
documentation.
