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today> Modulator ESP Adventures In Sound
 Forum index » DIY Hardware and Software » Circuit Bending
Bend Points Active Even When Not Physically Touching
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southboundpachyderm



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PostPosted: Wed Jan 15, 2020 1:24 am    Post subject: Bend Points Active Even When Not Physically Touching Reply with quote  Mark this post and the followings unread

I found an interesting bend in a children's toy, and then realized that it still works even when the leads are just close to each other, but not physically touching. In fact, the sound is a bit different that way from when it's a physical connection. Has anyone run into something like this? I have no idea what could be causing it. Some kind of electromagnetic interference, maybe?

It creates a great sound, though, so I'm trying to figure out how to include it in the project and be able to control it in a more predictable way. Since I can't use a toggle (the two bend points wouldn't be far enough away), I was thinking I could use a couple of RCA jacks with some distance between them and just patch it, although I'm not sure that would work. Is there a better way to handle this kind of thing?
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cslammy



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PostPosted: Wed Jan 15, 2020 8:39 am    Post subject: Re: Bend Points Active Even When Not Physically Touching Reply with quote  Mark this post and the followings unread

southboundpachyderm wrote:
. Is there a better way to handle this kind of thing?


Southbound: I have seen a lot of ways to do this, but I think the most common way that I have seen other DIYers use is to hook a prox sensor to an arduino and use that for proximity sensing.

https://learn.adafruit.com/using-vcnl4010-proximity-sensor/overview

Adafruit also has prox sensors for motions that occur further away:
https://www.adafruit.com/product/3942

perhaps instead of trying to reverse engineer however the proximity works for circuitbend it'd be easier to kludge something like this into the toy?

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PHOBoS



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PostPosted: Wed Jan 15, 2020 9:37 am    Post subject: Re: Bend Points Active Even When Not Physically Touching Reply with quote  Mark this post and the followings unread

hmm tricky,. it could be caused by inductive coupling, capacitive coupling, maybe the wires working as antennas picking up some other
electro-magnetic noise or a combination of all of them. Without knowing the exact cause it is going to be very hard to do it in a controlled
manner. You could try putting a (very small) capacitor between the leads to see what that does although I doubt you'll get similar results.
btw how close is close ? I wonder if you could have some fun with a set of adjustable antennas like these.

Be careful though, adding open connections can cause frying of circuits but that is of course always a risk with circuit bending.

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