From: Josh Koffman <joshybear@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Thu, 26 Nov 2020 09:32:53 -0800
Subject: [EE] Current Sense Project
Thread-Topic: [EE] Current Sense Project
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Hi all,

I'm thinking about throwing together a quick monitor for my block
heater. I'd like to know when I forget to plug the car in (because
let's be honest, it's going to happen...). I've got a small current
transformer on the way (5A/5mA). I'd like to trigger a relay that
lights up a 120V indicator light when the block heater is plugged in
and powered.

My "current" thought is to run the transformer to an ADC on a micro
and use it to trigger a relay. Am I missing an easier solution? Could
I run the output of the current transformer to an opto that triggers
the relay? I would lose the "tweakability" of levels though.

Open to suggestions!

Thanks,

Josh
--=20
A common mistake that people make when trying to design something
completely foolproof is to underestimate the ingenuity of complete
fools.
        -Douglas Adams
--=20
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