DMC109@PSUVM.BITNET (10/19/88)
I remember seeing plans for a pulse monitor a while back in some magazine (Popular Electronics, Radio Electronics, etc. I can't remember.) What I remember is a sensor that clipped on your finger. Does anyone have plans for anything along these lines? Many thanks in advance. Frank
wetter@cit-vax.Caltech.Edu (Pierce T. Wetter) (10/26/88)
in article <57916DMC109@PSUVM>, DMC109@PSUVM.BITNET says: > > I remember seeing plans for a pulse monitor a while back in some magazine > (Popular Electronics, Radio Electronics, etc. I can't remember.) > What I remember is a sensor that clipped on your finger. Does anyone > have plans for anything along these lines? > Many thanks in advance. > > Frank Your skin is invisible in the IR range. Your blood is opaque in that range. All you need for a sensor is a IR led on one side and a IR photo transistor on the other side. Now, I've never actually built one of these, but I'm going to. Someone is paying me to build a lie detector. The correct range is approx. 4000 to 7000 A I think. ____________________________________________________________________________ You can flame or laud me at: wetter@tybalt.caltech.edu or wetter@csvax.caltech.edu or pwetter@caltech.bitnet Caution: All my postings are 100% accurate from my point of view. However, my point of view rarely translates into english. Therefore any errors in my posting are your fault for not interpreting it correctly.