Editing Pulse Necklace 29July2009
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==Pulse Circuit== | ==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 | 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). 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]] | [[Image:OpticalHeartBeatCircuit.jpg]] |