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Author Topic: Getting 5V D/C from single live wire A/C light switch  (Read 3032 times)
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Kuala Lumpur, Malaysia
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How do I tap 5V D/C from a single live wire A/C from a light switch without turning on the light ?

Something like the attached picture ...


* description-of-switch.jpg (13.71 KB, 479x335 - viewed 66 times.)
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How do I tap 5V D/C from a single live wire A/C from a light switch

Very carefully.

Seriously: If you don't know how, maybe you shouldn't be doing it.
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It depends on what sort of current and if you need isolation. But if you have to ask about it then no you can't do it. Or at least you should not. Ever seen the Darwin awards?
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Some guy attached a lot of helium balloons to his deck chair, and he floated up into the air with a shotgun in his hand to burst the balloons if they got too high.

Needless to say, the system did not work the way he planned.
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Quote
the way he planned

Although "planned" might be too kind a word: "expected" maybe? Or even "hoped"....
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How do I tap 5V D/C from a single live wire A/C from a light switch without turning on the light ?
How current flow on only single wire?
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Connect a 5V DC wallwart in parallel with the light bulb.
http://www.dipmicro.com/store/DCA-0510
When the light bulb gets power, the wallwart gets power.
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How do I tap 5V D/C from a single live wire A/C from a light switch without turning on the light ?
How current flow on only single wire?

Zen-power
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Connect a 5V DC wallwart in parallel with the light bulb.
http://www.dipmicro.com/store/DCA-0510
When the light bulb gets power, the wallwart gets power.
But OP need 5V DC without turnung on the light
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How do I tap 5V D/C from a single live wire A/C from a light switch without turning on the light ?
How current flow on only single wire?

Zen-power
It's those pesky Zen diodes again, isn't it?
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Connect a 5V DC wallwart in parallel with the light bulb.
http://www.dipmicro.com/store/DCA-0510
When the light bulb gets power, the wallwart gets power.
But OP need 5V DC without turnung on the light
Take out the lightbulb?
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Left Coast, CA (USA)
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Measurement changes behavior
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Connect a 5V DC wallwart in parallel with the light bulb.
http://www.dipmicro.com/store/DCA-0510
When the light bulb gets power, the wallwart gets power.
But OP need 5V DC without turnung on the light
Take out the lightbulb?

Without access to both the AC line and neutral wires one cannot extract power for anything. It's like a bird sitting on a bare 2KV utility wire, nothing  dramatic happens to the bird because there in no current path.  smiley-wink

Lefty
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How do the 'no neutral wire' X10 modules like this do it?
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How do the 'no neutral wire' X10 modules like this do it?
There is a signal path through the load. But with not enough signal to actually do anything with the load.
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How do the 'no neutral wire' X10 modules like this do it?
It get the return path through the lamp.
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Incandescent (2-wire) switch can only control resistive load ≥40W (incandescent lamp or halogen lamps, etc). It
cannot control inductive or capacitive Load (like: Fluorescent lamps、save-energy lamps etc).
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