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The USBmicro U451 USB Relay Interface

The U451 is a USB solution that is pre-built, pre-programmed, and pre-tested and will get you interfacing your PC (Win⁄Linux) or Mac (OSX) to various devices in very little time! There is no USB device assembly, no driver development, and no firmware to write. Demo software applications can be used "right out of the box".

U451 top view.

Features of the U451 USB Relay Interface

Overview of the U451 USB Interface

The U451 provides a simple digital i⁄o interface for the PC (Win⁄Linux) or Mac (OSX) . Two relays, six transistor outputs, and eight i⁄o lines from the microcontroller are provided. Commands can be sent to the U451 that change the eight i⁄o lines from input to output. I⁄O lines can be individually selected as inputs or outputs. The U451 supports commands to read the ports, and if the ports are set to output, to write to the ports.

The U451 has all of the firmware features of the U401 and U421.

The U451 is an assembled and tested circuit card that is 2.8125 inches (72mm) long and 1.625 inches (47mm) wide. The U451 has 5 mounting holes.

The U451 interfaces to the PC (Win⁄Linux) or Mac (OSX) via the USB port. An application on the PC (Win⁄Linux) or Mac (OSX) controls the U451. The U451 does not use any custom drivers, just the drivers that are a part of the operating system. Custom software can be developed to use the U451, or the applications that have been created as examples here can also be used.

Uses for the U451 USB Relay Interface

With the U451 you can utilize the USB port on your computer to interface to various electronic devices, such as: lights, LCD displays, SPI analog and memory devices, switches, relays, tethered robots, model railroad control, and many custom circuits. PCB trace widths limit the connections to the relays to about two amps - this should not be exceeded.

See the ODN U4x1 Application Notes section for examples of using the U451.

Product suitability for your particular purpose⁄use

We have made every attempt to prepare information about the products we carry so that you, as a customer, can make an informed decision to purchase or not. It is entirely at your discretion to make this decision and we do not guarantee that a product will be suitable for any particular purpose.

Hardware:  U401 USB Interface    U421 USB Interface   U451 USB Interface

Programming:  USBm DLL Programming    Download Files

Application Notes:  U4x1 Application Notes    Misc Applications and Information    FAQ

While every effort has been made to make sure that the information posted on this site is correct, the author can not be held liable for any damages whatsoever for losses as a result of the application of this information. Use this information at your own risk.

USBmicro can design your custom and semi-custom USB product. Email about USB design can be directed to " Robert " at

Copyright © USBmicro, L.L.C., 2002-2010

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