Audio-activated Switch [Bluetooth Remote]

ddm

Joined Mar 4, 2011
7
Hello everyone, and thanks in advance if you are willing to help me out

I do a lot of low-light photography, so I already made a handy cable release for my new camera. The problem is, there is still a physical connection between me and the camera through the cable, so a tiny bit of vibration still passes through, ruining the point of a cable release.

ddm

Joined Mar 4, 2011
7
Since you can program, you might want to consider a pair of XBee radios. They have the same range as Bluetooth and the Pro version can be several kilometers. A small pair of reed relays on a couple of I/O pins would work your camera. These radio modules are small and about \$20 each.
Thanks for the suggestion, those really do look handy for a more complex project I'm also designing.

But seriously, is it really that difficult to detect a certain pitch (or even just a rise in amplitude) in a low-level audio signal? That XBee radio is way overkill for something as simple as basically passing a single bit through.

Edit: also, relays (anything that creates mechanical motion of any degree) would completely ruin the point of the entire thing. But there's no need for any significant amount of current to be passed at all, so I'm sure a transistor would do just fine to do the final switching.

blueroomelectronics

Joined Jul 22, 2007
1,757
Google 315MHz or 433MHz RF modules.