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Home d.i.y. Medical Devices Crazy Pacemaker Hack: d.i.y. High-Speed Photography

Crazy Pacemaker Hack: d.i.y. High-Speed Photography

High speed photography by David Prutchi using pacemaker as interval timer

This is a hack that combines three of my favorite passions: pacemakers, photography, and coffee!

I took this photograph by feeding the output of an infrared barrier to the atrium input of an old DDD pacemaker, setting an appropriate AV delay, and using the ventricular output to trigger a camera flash (via a optoisolator).  In a darkened room, I opened my camera’s shutter for 2 seconds.  I then let one drop of milk fall through the infrared barrier, starting the AV delay in VAT mode.  The flash then fires as the drop enters the coffee in the cup, freezing the action.

An action sequence is obtained by photographing drops with different delays.  The delay can be adjusted by either changing the height of the IR barrier or reprogramming the AV delay.

High-speed photography setup using an old implantable pacemaker

Drop entering cup of coffee. High-speed photography using an implantable pacemaker

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