Is There a Sensor to Detect Current Change and Turn on a Relay?

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Discussion Overview

The discussion revolves around the feasibility of using a sensor to detect changes in current or capacitance in order to turn a relay back on for a device plugged into a wall outlet. Participants explore various sensor options and seek clarification on the specifics of the setup.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests using a non-invasive current sensor but expresses uncertainty about whether a significant current change would occur when the device is turned on while the relay is off.
  • Another participant points out that the original question has been asked previously and questions whether the responses from that thread were helpful.
  • A participant expresses curiosity about the possibility of a sensor that can turn a relay back on and mentions a "quantum oscillator" as a method they do not fully understand.
  • One participant acknowledges the existence of sensors to check capacitance changes but emphasizes the need for more information to provide a meaningful answer, suggesting that a circuit diagram would be helpful.
  • Another participant requests a block diagram to better understand the functionality being sought and questions the rationale behind not using a simple switch or sensor to turn the relay back on.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on the best approach to detect current changes or capacitance changes to turn the relay back on. Multiple viewpoints and questions remain unresolved.

Contextual Notes

Participants highlight the need for additional details regarding the circuit setup and the specific functionality desired, indicating that assumptions about the application may be limiting the discussion.

Who May Find This Useful

This discussion may be of interest to individuals working on electrical engineering projects, particularly those involving relay control and sensor integration.

gyrgi
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I'm trying to figure out a way to turn a relay back on with a sensor. This relay is attached to a device that is plugged into a wall. I was thinking of using a non-invasice current sensor but I don't know if there will be a significant current change, if any, once I turn the device on, if the relay is still turned off.

Is there a sensor to check the change in capacitance of the wire that is turned on?
 
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gyrgi said:
I'm trying to figure out a way to turn a relay back on with a sensor. This relay is attached to a device that is plugged into a wall. I was thinking of using a non-invasice current sensor but I don't know if there will be a significant current change, if any, once I turn the device on, if the relay is still turned off.

Is there a sensor to check the change in capacitance of the wire that is turned on?

You kind of already asked this question here: https://www.physicsforums.com/threads/how-to-tell-a-wire-is-plugged-in.817417/

Did the replies in that thread not help you?
 
They are helpful on how to measure current without using current. But now I'm curious on if there is a sensor to turn a relay back on. I don't believe these methods suggested would work besides the "quantum oscillator " which I do not fully understand.

I was worried if I responded to that thread that it wouldn't be viewed.
 
gyrgi said:
Is there a sensor to check the change in capacitance of the wire that is turned on?
Yes, there are sensors but we need more information to answer your question.
The world is more complex than you realize. If you ask the right question you will get the right answer.
We require feedback from you to identify what your question actually means.
Can you produce a circuit diagram of what you have and describe the feature what you want to change or add.
 
You need to provide at least a block diagram that let's us see visually what functionality you are trying to achieve. What's this relay hooked to? Where does it get power? Why did it turn off?

Why can't you just hook up a switch or sensor to turn it back on.

I'm sure your actual application and issues are in your questions somewhere, but I can't really figure it out.

Details details details. We can't read minds.
 

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