Welcome to the openNIRS.org website – here you will find documentation and files for modular open Near InfraRed-Spectroscopy (NIRS) instrumentation hardware. The resources on this website are intended to help users getting started with their own from-scratch fNIRS designs.

For affordable wearable open source fNIRS instrumentation that enables high performance diffuse optical tomography (DOT) imaging please also see the openfNIRS.org project (www.openfnirs.org) of the Boston University Neurophotonics Center.

For an introduction to the subject NIRS and DOT, an overview of the state of technology (2014), documentation of the system concept, hardware, software and mechanical design and some evaluation and analysis results, please see the Documentation section and the corresponding Publication.

For schematics, layout, program code and CAD (STL) files please see the Files section.

If you are interested in the M3BA – Modular Multimodal Mobile Biosignal Acquisition – architecture, please see the corresponding M3BA website and corresponding Publication.

Before using any material on this website, please make sure to read the License Information for this open source/ hardware project and the below Warning/ Disclaimer.


If you choose to use the information and materials for openNIRS hardware provided on this website, you do this ENTIRELY AT YOUR OWN RISK.

The hardware was carefully designed to reduce any risks, e.g. by using batteries as energy and LEDs as light sources. However, everything provided on this website is done so WITHOUT ANY WARRANTY, especially without warranty of functionality, safety, completeness or merchantability.

By using the provided materials on this website, you agree to do so on your own risk and responsibility.