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Pulse Necklace 29July2009
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==Pulse Circuit== Using the [http://www.google.com/url?sa=t&ct=res&cd=6&url=http%3A%2F%2Felectronicdesign.com%2FGlobals%2FPlanetEE%2FContent%2F887.pdf&ei=YjlmSsO-GIGsswO_-PXdDg&rct=j&q=optical+heart+beat+circuit&usg=AFQjCNH9Z1TNjAXLQgcEffPhpZKDL2vTUA circuit] that I found, I wired up a heart beat sensor. It WORKS! But, like the watch, it's difficult to get the optical sensor and your finger "aligned" correctly, so it often doesn't give a signal. I had the best luck when I pressed my thumb into the sensor, with my index finger holding the other side of the sensor with low to moderate pressure. When it does give a signal, the LED seems to blink at *half* the speed of your heart, i.e. each beat causes a state change (from on to off or off to on). This is really puzzling, since it should blink at the same speed. It also seems to miss a fair number of beats. Is it really working? Picture: [[Image:OpticalHeartBeatCircuit.jpg]] You can see the sensor, it's the little black box on the left of the group of three. The IC is a dual op-amp, the other black boxes are the transistors. The RBBB arduino clone is being used only for the 5V regulator. Given this experience, and having had the same experience with the pulse watch, I think that the idea of just pressing the sensor into our necks and hoping it's going to work is totally out. However, it's still possible that a solution involving clipping the sensor to your ear-lobe might work, since that can (hopefully?) be made secure and non-variable. We need to experiment with this. Anything you clip to your ear-lobe with some amount of pressure, begins to cause pain after a few minutes. (tried it with EEG-reference electrodes) --[[User:Rain|Rain]] 13:23, 30 July 2009 (PDT)
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