MAX86141 Breakout Board for Arduino, Do Pulse Oximetry and Brain FNIRS!

MAX86141 Breakout Board for Arduino, Do Pulse Oximetry and Brain FNIRS!

Breakout board for State-of-the-Art Pulse Oximetry and Brain FNIRS. 


New Crowd Supply campaign coming soon. Web sales suspended till further notice.


  • MAX86141 dual channel 19 bit 4000sps simultaneous sampling ADC
  • Two high sensitivity BPW34S photodiodes
  • Bright 640nm Red and 940nm Infrared LEDs
  • Low noise LDO and SPI Logic


Breadboard-friendly design. Comes with free drivers for Arduino and free software support for brain biofeedback and pulse oximetry.


Drivers can be found on our github page, and will be updated with more basic commands and demo features. Design files can be found here.


Free downloadable software demo here:


New Whitepaper here.


The last two images of the pulse waveform on this page were taken through our skull, compared to the first image taken on our finger. The signal quality is excellent for FNIRS! Our main goal with this model was to make it the best possible oximeter, powerful enough to accomplish clean signals at depth for FNIRS tasks, where noise has traditionally been a major issue.

This breakout board is flexible and can be used as a folded finger tip pulse oximeter or a ~1 inch depth-penetrating reflectance oximeter or brain FNIRS device. It is highly durable for general use, easy to use with our free drivers, and is the main ingredient in our HEGduino V2: The Delobotomizer which we use for biofeedback and experimental brain oximetry. We are offering it as an open source breakout board for all of your creative and research ideas.


Support the future of biofeedback and open source imaging tech by supporting our work! We are dedicated to producing low cost state of the art brain and health tools for the general public to learn and use.  Thank you!


All hardware and software offered under the MIT License for open hardware and open software. This is inspired by the work of Hershel Toomim and Bob Marsh (with the now-public domain patent 5995857) at the Biofeedback Institute of LA/Biocomp Research.


    If you just want to support the project:

    ©2020 HEG Alpha by B&H Research.