How to safely make a loud/big EM field?
So I was thinking. I have access to some really cool spaces that get visited by all sorts of weird people. I'm sure biohackers sometimes wander through. I would love to build a large em field that could be toggled off an on silently. You could have it beep out a phone number or email address in morse code. Biohackers visiting would know that someone else was there.
The programming side of it is simple, but I'm not sure what to use to make a large enough field to be noticed. Thoughts?
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You'd also have to be careful with things like pacemakers (which sometimes have magnetically operated switches).