From: Dwayne Reid <dwayner@planet.eon.net>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Thu, 26 Nov 2020 15:04:15 -0800
Subject: Re: [EE] Current Sense Project
Thread-Topic: [EE] Current Sense Project
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Hi there, Josh.

I would connect the secondary of the CT to the input of a bridge=20
rectifier.  The output of the bridge rectifier drives the LED(s)=20
directly.  Usually, no resistors needed.

5mA is way tons of current for modern Green LEDs.

dwayne


At 10:32 AM 11/26/2020, Josh Koffman wrote:
>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
Dwayne Reid   <dwayner@planet.eon.net>
Trinity Electronics Systems Ltd    Edmonton, AB, CANADA
780-489-3199 voice   780-487-6397 fax   888-489-3199 Toll Free
www.trinity-electronics.com
Custom Electronics Design and Manufacturing

--=20
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