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==Optical Heart Beat Circuits== [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 Awesome digital and analog heart beat circuit] - but quite complicated. I think this is by far the best thing I found. [http://www.emant.com/694006.page Optical Heart Rate Monitor] - dead simple, actually almost too simple to believe that it works, in fact they do a lot of magic in the software, and say that if the signal is noisy the BPM will be wrong. [http://www.google.com/url?sa=t&ct=res&cd=9&url=http%3A%2F%2Fece-classweb.ucsd.edu%2Ffall08%2Fece191%2Fweekly_presentations%2FGroup6%2FFinal_ppt_grp_6.ppt&ei=YjlmSsO-GIGsswO_-PXdDg&rct=j&q=optical+heart+beat+circuit&usg=AFQjCNFOolbZzltHxC7wbOr88dYS6m0OGQ Yet another project, with filtering circuit] - looks to be in-progress effort at the time of the report, so who knows if it works or not. [http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1210267126 Strobe the LED Idea] - this page talks about how in some commercial light detecting circuits, they strobe the LED, and then have a high pass filter, and in this way they deal with ambient light fluctuations. But I don't know if the signal we want (reflectance difference due to pulse) would survive this treatment. Here is a [http://hades.mech.northwestern.edu/wiki/index.php/Analog_Input High Pass Circuit]. [http://www.patentgenius.com/patent/6277079.html Flashing earring heartbeat monitor] - really cool armature idea!
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