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See also this video http://www.youtube.com/watch?v=y69Mu1SDXDk
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See also this video http://www.youtube.com/watch?v=7TdpkDmWFdw
    
Physics with the XO. A clothes peg with a white LED illuminates a LDR. If pressed between an area of translucent ​​skin such as the lobe of the ear or the area between the thumb and index finger, the program monitors your pulse using Turtle Art by measuring the change in the percentage of transmitted light. (To optimize use red LED). You can measure heart rate.
 
Physics with the XO. A clothes peg with a white LED illuminates a LDR. If pressed between an area of translucent ​​skin such as the lobe of the ear or the area between the thumb and index finger, the program monitors your pulse using Turtle Art by measuring the change in the percentage of transmitted light. (To optimize use red LED). You can measure heart rate.
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