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Usb experiment interface board

Velleman K8055: USB Interface Board Kit

Velleman K8055

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Velleman K8055: USB Experiment Interface Board Kit


The Velleman K8055 USB Experiment Interface Board Kit contains what you need to build your own USB interface I/O board. The K8055 board connects to your PC and allows you to control other digital devices and experiment with automation, audio and lighting display, and other fun projects. The K8055 board has 5 digital input channels and 8 digital output channels. Additionally, there are two analogue inputs and two analogue outputs with 8-bit resolution.


You can further expand the number of inputs/outputs can by connecting up to four more cards to the PC's USB connectors. All of the communication routines are contained in a DLL (Dynamic Link Library). With the Velleman K8055 USB Interface I/O Board you can write custom Windows applications in Visual Basic, Delphi, C++ Builder or any other 32-bit Windows application development tool that supports calls to a DLL. Conversion time per commmand is 20ms.  Hobbyists everywhere agree that Velleman has some of the best electronic kits around.


System Requirement For Using the Velleman K8055 Kit with Your PC

PCs must have Pentium class CPU, USB conection of 1.0 or higher, CD-ROM player, and mouse to use with Velleman K8055 USB Interface Experiment Board Kit. Standard communication routines are contained in a dynamic link library (DLL). However, you can write custom code with:

  • Windows (XP, 2000, Me, 98SE)
  • Vista
  • Delphi applications
  • Visual Basic
  • C++ Builder

Code Tip: With the use of IOGateway you can register cards as ActiveX and open more software options such as Excel VBA and LabVIEW


Velleman 8055N

Looking for a faster version of the Velleman K8055 USB Experiment Interface Board Kit?

Try the new, updated Velleman K8055N    






  • Digital Inputs: 5 (With on board test buttons, 0=ground, 1=open)
  • 2 Analog inputs
    • Attenuation and amplifications option
    • Internal test +5V provided
  • 2 Analog outputs
    • 0 to 5V
    • Output resistance 1KS
    • PWM 0 to 100% open collector output max 100mA/40V
    • On board LED indication
  • 8 Output switches
    • Max 50V/100mA
    • On board LED indication
  • Conversion time: 20ms/command
  • USB power supply: 70mA
  • Dimensions: 5.7 x 3 3 .8”



Assembling and Using Your K8055 Experiment Interface Board 

Velleman VTSSC40NU

It is recommended that users have a basic understanding of electronic programming for use of Velleman K8055 USB Experiment Interface Board Educational Kit. This Velleman kit contains 97 components, thus, some advanced soldering will be required to put the board together. System does not require batteries. Visit the Velleman Projects guide for assistance with construction and use of the K8055. 




Diagnostic/Test Software

  • Separate output /Input test
  • Clear all /Set all function
  • Counter function on inputs 1 and 2 with adjustable debounce (max 2kHz depends on total I/O load)
  • Analog output set sliders
  • Analog input bar-graph indication



Related Products


Mini USB Interface Board Looking for a smaller solution? Try the Velleman VM167 Mini USB Interface Board.

Velleman K8061 Interested in an interface board with more inputs and outputs? View the Velleman K8061.

Velleman VM110N Or, for an assembled version of the board? View the Velleman VM110N.



Velleman K8055 Software Downloads


  • K8055, K8055N, VM110, VM110N application for Android

    Here is an Android version of the demonstration app used for the Velleman K8055, K8055N, VM110 & VM110N USB Experiment Interface Board.

    Download the application here: K8055 Android application


  • Plug-in for IPEmotion measurement software

    Those who are already working with the Velleman K8055 Experiment board will benefit from the plug-in for IPEmotion measurement software.

    Downloa the Velleman K8055 Plugin

    It's so easy, just watch this Youtube video!



Additional Information

Difficulty Level 4
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Parts list
English assembly instructions through illustrations, pictures, etc.

DLL usermanual
Manual explaining the kit\'s possibilities and how to use the kit


Complete SDK Pack (Rev 4.0)
Full SDK pack with DLL Version 4, test/demo software and examples, supports Borland C builder, Delphi, DevC, Excel, VB6, VB2008, VC#, VC2008,... for Windows XP, Vista or Windows7. (released 19/1/2011)

Labview 8
3rd. party, National Instruments Labview driver for the K8055 board

Info Sheets

Resistor colour code

Overview of Velleman modules that are equal to D.I.Y Kits
This sheet is useful when you want to know which modules you could find in the do-it-yourself range of Velleman Kits and minikits.

Frequently Asked Questions

Q. Is an assembled version of the K8055 available?


Yes, the assembled version is the Velleman VM110N.

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