Parallax 27113 Instruction Manual

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.
Copyright © Parallax Inc.
Web Site: www.parallax.com
Forums: forums.parallax.com
Sales: sales@parallax.com
Technical: support@parallax.com
Digital I/O Board Kit (#27113)
Office: (916) 624-8333
Fax: (916) 624-8003
Sales: (888) 512-1024
Tech Support: (888) 997-8267
v1.0 2/19/2010 Page 1 of 13