<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div><span></span></div><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><div><span></span></div><div><meta http-equiv="content-type" content="text/html; charset=utf-8">I’ve done this!<div><span style="background-color: rgba(255, 255, 255, 0);"><br></span></div><div><span style="background-color: rgba(255, 255, 255, 0);"><a href="http://youtu.be/ylBJaHchoEU">http://youtu.be/ylBJaHchoEU</a></span></div><div><br></div><div>Used an arduino and one of these:</div><div><br></div><div><a href="https://coolcomponents.co.uk/products/pulse-sensor?utm_medium=cpc&utm_source=googlepla&variant=45223107150&gclid=Cj0KCQjw77TbBRDtARIsAC4l83nYyMLaCzFDAj1pijZkRSKpY0b7WjPrfWVp52zfDDGdQd8-dCH54iUaAsx7EALw_wcB">https://coolcomponents.co.uk/products/pulse-sensor?utm_medium=cpc&utm_source=googlepla&variant=45223107150&gclid=Cj0KCQjw77TbBRDtARIsAC4l83nYyMLaCzFDAj1pijZkRSKpY0b7WjPrfWVp52zfDDGdQd8-dCH54iUaAsx7EALw_wcB</a></div><div><br></div><div>Other shops are available ;-)<br><br><div>I’ve done this twice actually, one used midi to transfer the pulse with a simple on off, the other transmitted a simple cv pulse that I used to drive a sequencer driving my modular. I took that setup to a maker faire here in Edinburgh, it was great fun, something really magical about people driving this system with their body. And also great fun to see people running on the spot trying to up the bpm!</div><div><br></div><div>If you want I’ll try and share the code - I had a computer disaster but I should be able to get it I think?</div><div><br></div><div>Cheers,</div><div>Scott.</div><div><br>On 10 Aug 2018, at 12:02, <a href="mailto:rburnett@richieburnett.co.uk">rburnett@richieburnett.co.uk</a> wrote:<br><br></div><blockquote type="cite"><div><span>On 2018-08-10 10:23, Gordonjcp wrote:</span><br><span></span><br><blockquote type="cite"><span>Your pulse doesn't make any sound. You can feel a slight flexing of the</span><br></blockquote><blockquote type="cite"><span>radial artery when you take your pulse at your wrist, but it's way too</span><br></blockquote><blockquote type="cite"><span>small and slow to make any noticeable sound.</span><br></blockquote><blockquote type="cite"><span>When you measure blood pressure with an old-fashioned sphygmomanometer</span><br></blockquote><blockquote type="cite"><span>you're listening for blood scooshing through the brachial artery as the</span><br></blockquote><blockquote type="cite"><span>air bladder in the cuff squeezes it shut. You pump it up until the</span><br></blockquote><blockquote type="cite"><span>noise stops (artery closed) then release the pressure until you just</span><br></blockquote><blockquote type="cite"><span>start to hear it hiss through which gives you the systolic pressure, and</span><br></blockquote><blockquote type="cite"><span>slowly release it some more until you just hear it as a faint tapping</span><br></blockquote><blockquote type="cite"><span>for the diastolic pressure.</span><br></blockquote><span></span><br><span>A colleague across the office from me who's working on a project in this area said exactly the same as what Gordon said. Practically word for word.</span><br><span></span><br><blockquote type="cite"><span>Automatic sphygs use the change in pressure in the bladder to measure</span><br></blockquote><blockquote type="cite"><span>it, apparently. I've never had one apart.</span><br></blockquote><span></span><br><span>The "Oscillometric method" apparently, for anyone interested...</span><br><span></span><br><span><a href="https://en.wikipedia.org/wiki/Blood_pressure_measurement#Oscillometric">https://en.wikipedia.org/wiki/Blood_pressure_measurement#Oscillometric</a></span><br><span></span><br><span>-Richie,</span><br><span></span><br><span>_______________________________________________</span><br><span>Synth-diy mailing list</span><br><span><a href="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a></span><br><span><a href="http://synth-diy.org/mailman/listinfo/synth-diy">http://synth-diy.org/mailman/listinfo/synth-diy</a></span><br></div></blockquote></div></div></div></body></html>