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Looking to trigger a handheld "buzzer" using a motion detector, any advice? Answered

Hey everyone!

I am currently working on a project that would allow my employees to be alerted once somebody walks through our doors, without annoying anyone (so a bell is out of the question, haha). My idea is to have a motion detector above the door, and once someone walks through it, a handheld buzzer will go off (to alert my employees). I'm thinking that I'll need a PIR sensor, a vibration motor, possibly a micro-controller(?), and some kind of power source.

Something I'm struggling with is finding a way to trigger the buzzer, without being physically connected to the PIR sensor.

What do you guys think?

P.S. Please excuse my lack off knowledge, as I'm more of a software guy ;)