Need help with audio trigger for camera....how do I generate a beep/click 300m away?
I have a DSLR Canon 550D camera with Magic Lantern modified firmware installed on it. This firmware allows the camera to be triggered by sound, utilizing the cameras onboard mic. The level of sound required to trigger the camera can be adjusted.
What I would like to do is have the ability to trigger the camera from quite a distance with some sort of audio trigger. If I have this trigger close enough to the mic and adjust the levels it would only need to make a decent click. To get decent range I am assuming I will need to use a radio device? Can anyone think of anything cheap and compact that could work as a trigger? Using walkie talkies is the obvious thing that comes to mind but these are rather bulky....ideally the trigger would be small enough to clip/tape to the camera. In terms of range, 200-300m would likely be the upper limit.
Any thoughts would be appreciated :)