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Author Topic: How to sense the switching of this?  (Read 3153 times)

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cheerio

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How to sense the switching of this?
« on: May 10, 2012, 00:08:18 AM »
Hi, i need to sense if the switch is closed or not. But i can only access the cable in the green marked area. I do not want to cut the cable if possible.
« Last Edit: May 10, 2012, 00:10:23 AM by cheerio »

kam

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Re: How to sense the switching of this?
« Reply #1 on: May 10, 2012, 04:46:34 AM »
This is a case that once had me bothered for my bike lights. I came up with 2 ways, both had to do with current. You can use a series resistor (cut the wire) and measure the voltage drop across it. Or you can use a current transformer without cutting the wire, and monitor the current of the coil. Both ways require that the bulb is operating and that current will flow if the switch is closed.

_pike

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Re: How to sense the switching of this?
« Reply #2 on: May 20, 2012, 21:49:07 PM »
The best way is current sensing as kam said......
« Last Edit: May 20, 2012, 21:51:18 PM by _pike »