Thursday, May 7, 2009

Debugging success

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I helped get one group's pulse rate monitor to work - after a lot of finagling :-P Managed to get the Schmidt hysteretic trigger to work by a putting in a manual-tuning potentiometer in the voltage divider for the reference voltage... since the setup is rather finicky. And there's only a narrow range of finger positions for it to work, especially if you have weak pulses (i.e. cold hands...) It's the same problem as the thermistor experiment, where some people's resistance values went in the wrong direction because they had cold hands...

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