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Author Topic: Piezoelectricity powered by rain drops  (Read 4988 times)

Offline Steven Dufresne

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  • Posts: 349
    • Non-conventional Energy Experiments
Piezoelectricity powered by rain drops
« on: May 27, 2011, 01:25:14 AM »
For a while now I've wondered if rain drops falling on a piezoelectric crystal could light up an LED. I pictured having a whole array of these outside being lit up. Over the past two weeks I finally tried it. It's a lot harder than it seems.

First of all, unless it's really raining hard it won't do it - at least not with the  crystal I used, a piezoelectric disk taken from a musical gift card. So I ended up making a fancy contraption that captures the rain and then meters out drops of a fixed size and maximum rate and makes them fall around 4 feet before hitting the disk which powers LED. It took a lot of trial and error and versions, but it works, when it rains.

Anyhow, details are here:
including a video. Or you can just watch the video without all the details directly from here:

Sadly, I can't see it's worth pursuing further. Oh well. Seeing as how there's interest here in piezoelectricity, I thought I'd share. I'm sure it'll give someone ideas.