> Doesn't your sensor also require skin contact? Yup, but it doesn't need to be strapped tightly to the user's chest. A near impossibility if you are sharing wi

> Doesn't your sensor also require skin contact? Yup, but it doesn't need to be strapped tightly to the user's chest. A near impossibility if you are sharing with nerds ;) Your suspicion of our audience is correct. We don't want to compete with the overly saturated excersize-pulse-rate gizmo market. We see every year our students at Parsons Design + Technology department curious about using heart rate data in a project. We hope this will appeal to entry level and seasoned hackers who want an affordable way to play with biofeedback. The answer to 'what kind of applications' is to look out the window and wonder. The data that you get from the sensor is variable voltage based on (relative) oxygen level of blood. In the video on kickstarter site, at about 1:20, the waveform you see on the computer screen is raw analog data from the sensor. It is passed directly from an arduino into a processing sketch, which serves as a visualizer. Just thought of an application: Use the fluctuating waveform from the sensor to modulate a tone, say, or make beats.