Pages: [1] 2 3   Go Down
Author Topic: Getting 5V D/C from single live wire A/C light switch  (Read 3271 times)
0 Members and 1 Guest are viewing this topic.
Kuala Lumpur, Malaysia
Offline Offline
Full Member
***
Karma: 4
Posts: 205
Anything is possible
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

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 70 times.)
Logged


Valencia, Spain
Offline Offline
Faraday Member
**
Karma: 152
Posts: 5757
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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.
Logged

No, I don't answer questions sent in private messages (but I do accept thank-you notes...)

Manchester (England England)
Offline Offline
Brattain Member
*****
Karma: 639
Posts: 34726
Solder is electric glue
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

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?
Logged

Global Moderator
Melbourne, Australia
Offline Offline
Brattain Member
*****
Karma: 511
Posts: 19350
Lua rocks!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

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.
Logged

http://www.gammon.com.au/electronics

Please post technical questions on the forum - not to me by personal message. Thanks a lot.

Johannesburg. UTC+2
Offline Offline
Faraday Member
**
Karma: 114
Posts: 4961
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
the way he planned

Although "planned" might be too kind a word: "expected" maybe? Or even "hoped"....
Logged

The Elders of the Internet know who I am
I'm on LinkedIn: http://www.linkedin.com/in/jimbrownza

SG
Offline Offline
God Member
*****
Karma: 11
Posts: 535
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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?
Logged

Global Moderator
Boston area, metrowest
Offline Offline
Brattain Member
*****
Karma: 549
Posts: 27425
Author of "Arduino for Teens". Available for Design & Build services. Now with Unlimited Eagle board sizes!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

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.
Logged

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

Johannesburg. UTC+2
Offline Offline
Faraday Member
**
Karma: 114
Posts: 4961
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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
Logged

The Elders of the Internet know who I am
I'm on LinkedIn: http://www.linkedin.com/in/jimbrownza

SG
Offline Offline
God Member
*****
Karma: 11
Posts: 535
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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
Logged

UK
Offline Offline
Faraday Member
**
Karma: 100
Posts: 4153
Where is your SSCCE?!?!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

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?
Logged

Get 10% off all 4D Systems TFT screens this month: use discount code MAJENKO10

UK
Offline Offline
Faraday Member
**
Karma: 100
Posts: 4153
Where is your SSCCE?!?!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

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?
Logged

Get 10% off all 4D Systems TFT screens this month: use discount code MAJENKO10

Left Coast, CA (USA)
Offline Offline
Brattain Member
*****
Karma: 362
Posts: 17307
Measurement changes behavior
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

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
Logged

Norfolk UK
Offline Offline
Faraday Member
**
Karma: 71
Posts: 2614
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

How do the 'no neutral wire' X10 modules like this do it?
Logged


Manchester (England England)
Offline Offline
Brattain Member
*****
Karma: 639
Posts: 34726
Solder is electric glue
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

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.
Logged

SG
Offline Offline
God Member
*****
Karma: 11
Posts: 535
Arduino rocks
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

How do the 'no neutral wire' X10 modules like this do it?
It get the return path through the lamp.
Quote
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).
Logged

Pages: [1] 2 3   Go Up
Jump to: