The data from your average hobbyist metal detector appears to be in audio form, frequencies... up to 8 Khz in my case. I wonder what's the best way to make arduino read that data... is there some audio module I can use ? I'm trying to keep it as simple as possible, how would you go about it?
Read the data after the internal electronic board has done the detection.
I can tell you to hook the red wire to the blue on but that is useless. A schematic of the detector would be a big help. Also post links to it showing technical information. What domain are you planning on reading it, analog or digital? Put together a prototype schematic if you can that would help. How long will it run on a charge, much power will you need and what battery.
Oh, I guess I should be more specific about the kind of metal detector I was referring to... google garrett 250 for example. The electronics is encased with a monitor, it's a copyrighted product, you put in the parameters and it lets out a sound when it detected something based on the entered parameters. It's not meant to be hacked by hobbyist and companies are certainly not gonna release schematics of their metal detectors which they sell to metal-detecting beach-combing antique finders folks, not to some electronics tinkerers. Also, my idea isn't to hack it, but to to read its audio output..hence the question
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