What would make FlexVolt even more fun and convenient to use?  If it could send data to your computer (or smart phone!) wirelessly.  Now that is possible!

FlexVolt can now come with Bluetooth capabilities.  Check out the kickstarter page for the new rewards.  Details:

  • Power:  Li-Ion battery, rechargeable button cells – small but powerful!
  • Lifetime:  Minimum 3 hours of continuous measurement
  • Charging: USB
  • Battery management:  overcharge protection, undervoltage protection (this is critical for battery life in Lithium batteries!)
  • Data transfer:  Bluetooth, or USB if connected.  User-selectable.
  • Compatibility:   Mac, PC, smart phones, tablets (apps for Android coming soon!)
  • Bluetooth protocal : Bluetooth Specification v2.0+EDR (enhanced data rate)

Here’s a short video demonstration of transferring data over Bluetooth to a Mac:


I tested FlexVolt for use in EKG as well, after several questions about potential to use FlexVolt to measure heart signals.  While it is not a 12-lead EKG, I do get nice signals from my heart, similar to signals seen using a 3-lead EKG.  I have electrodes at left and right shoulder and left abdomen near bottom rib.  Pretty cool to watch the spikes:

Several people have asked about measuring eye movements with FlexVolt.  EOG (electrooculography) is the measurement of the electrical signals generated in and around the eyes due to contraction of different muscles controlling gaze direction.  So I placed electrodes above and below my eye, with the body reference connected to my left shoulder (I was previously testing EKG).


Looking up produced a positive bump, and looking down produced a negative bump!  Blinking is also apparent in the signal, but fortunately a different shape compared to eye movement.

What we’ve been up to:

July-September 2013: Groundwork – Initial research, electronics design, and prototyping. We started with an oscilloscope, a bread board, and an arduino!

September-November: Product Development – After many bread board iterations, we transitioned from bulky breadboard prototype to PCBs. We’re now on version 4.0 for the USB FlexVolt. We also used this time to work on firmware and software applications. We now have betas for several apps.

November-December: Business Development – We now have a business model, economic analysis, images and videos, and a kickstarter page. We are ready to launch!

We have a website up and running now – we can start posting details about FlexVolt, and eventually this site will host user and developer forums, as well as a web store.