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==Prior Art== I already have a set of chokers with surface mount LEDs inside (I've shown this at prior meetings during show and tell). I am unsure of how the LEDs are wired - it's possible that they are all controlled from the same wire, in which case the device will not be able to display as above, and instead will simply flash. I got the chokers from [http://store.rebeccas.com/store/merchant.mvc?Screen=PROD&Product_Code=LI1069&Category_Code= Rebeccas] for only $2.15 each, so if they are suitable they make great kit components. Reverse engineering the choker's flexible PCB: <pre> Lights: 1-12, counted from the batteries (Only lights 1, 3, 5, 6, 7, 8, 10, 12 are populated) Pins: 1-6, counted from the big ground of the batteries nearest the ribbon cable Schematic Reverse Engineer: Pin 1: V+ for all lights Pin 2: V- for 1, 3, 5 Pin 3: V- for 2, 4 Pin 4: V- for 6, 8 Pin 5: V- for 7, 9, 11 Pin 6: V- for 10, 12 Apparently the LEDs are very easy to fry, since both green and pink choker now have many non-functional LEDs </pre> I've done some google searches, but I haven't been able to find anything like this. There are some pulse-sensing watches, for instance [http://www.chinavasion.com/product_info.php/pName/exercise-watch-pulse-calorie-reader/ Chinavasion: Exercise Watch - pulse + calorie reader] or see some reviews at [http://www.consumersearch.com/heart-rate-monitors Heart Rate Monitors]. These devices almost universally have a small display, but I think a haptic solution could be greatly superior. [[Image:PulseWatch.jpg]] You can see in the image a small heart on the left side of the display. When it's sensing your pulse, this heart blinks with your pulse, which is super cool. The sensor is under my index finger on the right hand side. You need to just touch the sensor - if you press hard, that destroys the signals (presumably because the pressure makes it so your skin doesn't respond to the pressure of your blood and instead just responds to the pressure of your hold...)
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