| hpy
May 26 |
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Oh I see @Harold! That’s simpler than I thought. If it’s hot rods you want to photograph, you can set the trigger threshold to very high dB, thereby prevent most false triggers. And since the camera traps will be deployed roadside, probably with sufficient sun exposure and relatively easy to service, power consumption is probably not a problem. So I think what you’re suggesting is almost like a speed camera but acoustically instead of optically triggered…
Yes that’s right!
Just curious: Do you think modding an Audiomoth into the acoustic trigger would help? Or just building something from scratch using the PH0645 microphone?
I think the Audiomoth could probably be modified to be an acoustic trigger, but I don’t think it will be easy to integrate an I2S mic. The native mic is a MEMS PDM unit, and it also has an analog port. If the mic – regardless of output type – is calibrated, then it can be used. But then, something like https://sea.banggood.com/Voice-Detection-Sensor-Module-Sound-Recognition-Module-High-Sensitivity-Sensor-Microphone-Module-DC-3_3V-5V-p-1357680.html could also be used, if one were to go to the trouble of calibrating it.
As for stereo camera traps…
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In any case, I think the biggest core concept of both of our ideas (plus the BoomBox) is to tap into the triggering circuitry of existing camera traps. Right?
The closest thing I am aware for understanding that circuitry is this documentation of the BoomBox. Pages 12 & 13 links to Freaklabs’s documentation on how to tap into the motion sensors in 4 different models of camera traps. I’ve used camera traps extensively in the field, but don’t have the electronics expertise to fully understand if the information in that documentation is enough for us to plan next steps.
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I had not seen this doc! That is exactly correct, the 2 cameras’ PIR sensor output pins need to be combined. Usually the PIR’s output pin goes to a diode or transistor, and it is the output of this diode or transistor that should be wired together (and the grounds of both cameras need to be connected also). Then the slave unit can have its PIR sensor blindfolded so it never triggers. I do believe that’s all: stereo camera trap!