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Usb experiment interface board

Velleman K8055N: USB Interface Board Kit - Updated Version

Velleman K8055N

K8055N Updated Digital I/O Board

If you're looking to create and connect with your PC and other electronics, this experiment interface kit will set you up with the board you need! Use this board to control air, heating, lighting, audio, and more! An understanding of I/O board assembly and programming is helpful in completing your projects with the K8055N.

Our faster, updated USB interface board still has 5 digital input channels and 8 output channels to create and play with your other electronic devices from your computer or laptop. The board has two analog input devices and two output devices but more can be added by connecting cards through your PC's USB connectors. Communication routines remain contained in DLL but any Windows 32-bit applications that support calls to DLL allow for custom communication writing.

Whats new with the K8055N? 

  • Pulse counters increase from 16-bits with the K8055N to 32-bits and can count up to 20kHz
  • Faster USB communication
  • General conversion time 2ms/command improved from 20ms/command
  • Counter function on inputs max at 20kHz improved from 2kHz
  • PWM frequency of 46 kHz improved from 23 kHz

See the Velleman K8055 for details and specifications on the original model.

Interested in an interface board with more inputs and outputs? View the Velleman K8061.
Or, for a mounted version of the board? View the Velleman VM110N.

Note: Your K8055N may be labeled K8055 as we are phasing out the previous model. Please contact us if you have any questions about your K8055 order.


  • Connect up to 4 cards
  • Uses Microsoft® human interface device (HID) driver, no external driver required
  • Diagnostic/Test Software:
    • Separate output / input test
    • Clear all / set all function
    • Counter function on inputs 1 and 2 with adjustable debounce (max 20kHz depends on total I/O load)
    • Analog output set sliders
    • Analog input bar-graph indication


Digital Inputs 5 (0 = ground, 1 = open) On board test buttons provided
Analog Inputs 2 with attenuation and amplification option (Internal test +5 V provided)
Digital Open Collector Output Switches 8 (Max. 50 V / 100 mA with on board LED indication)
Analog Outputs 2
  • 0 to 5 V, output resistance 1K5
  • PWM 0 to 100% open collector outputs Max. 100 mA/ 40 V with on board indication
General Conversion Time 2 ms per command
Power Supply Adapter USB, 70 mA
Dimensions 5.7 in. x 3.5 in. x 0.8 in.

Additional Information

Difficulty Level 5


Parts list (rev.1)
English assembly instructions through illustrations, pictures, etc.


K8055N software pack
DLL,demo and examples for K8055N & VM110N (this software is downwards compatible with our K8055 & VM110 USB boards

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.

 Warning: this product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to: www.P65Warnings.ca.gov/product