Lit an LED wirelessly

[Badar]

I want to turn a LED on and off wirelessly.
How can i do that.I need full description or circuit diagram.
Any help is highly appreciated.

 

[Nigel Goodwin]

I want to turn a LED on and off wirelessly.
How can i do that.I need full description or circuit diagram.
Any help is highly appreciated.

For a start you need to be more explicit about what you're wanting to do.

 

[HarveyH42]

I can think of several 'wireless' mediums to transmitter the on/off signal, kind of depends on the range, the enviroment (indoor/outdoor), line of sight, obstructions, destructions... Some cost a lot more then others. There are really a lot of ways to do this, please be specific.

*It's killing me not to type a stupid remark about what you mean by LED, and the region you are from. Sorry, but don't know if you have a sense of humor about such things.

 

[justDIY]

when someone sends an sms message to my cellular phone, a whole bunch of leds light up, and it's all done wirelessly!

 

[TheVictim]

Make a spark gap transmitter with an automotive ignition coil and you can detect the output with a small pile of iron filings wired in series with your LED, battery, and a current limiting resistor.

 

[zevon8]

Shine a laser pointer on an LED that has another LED connected to its leads. The second LED will light. Amaze your friends.

 

[Marks256]

Shine a laser pointer on an LED that has another LED connected to its leads. The second LED will light. Amaze your friends.

Will that really work?

 

[Gayan Soyza]

Build an LDR circuit (Light dependent one-when the light comes the LED turns ON) focus the LASER beam into LDR & the output LED will be lights up.
You can adjust the LDR sensitive according to the LASER light available.

 

[bananasiong]

Will that really work?

I wonder if it is working..
If you focus the laser beam on a LED, maybe the LED looked turn on. But zevon8 said another LED will be light on? Interesting.

 

[things]

Will that really work?

yes it will, LED's act like solar panels when you shine light onto them, so hooking one led to another and shining a laser at it will work.

 

[bananasiong]

yes it will, LED's act like solar panels when you shine light onto them, so hooking one led to another and shining a laser at it will work.

Wow, I have never heard about that.

 

[things]

just get a laser, a water clear led of the colour of the laser, and a standard led. wire the led positive to the positive of the other led and so on, shine the laser onto it, and it should light the opposite led

 

[Gayan Soyza]

a water clear led of the colour of the laser,

What does it mean? If a laser beam is red colour do we need a red LED bulb?

 

[pc88]

What does it mean? If a laser beam is red colour do we need a red LED bulb?

Yes - LEDs will also operate in reverse so that photons striking the LED will
generate a voltage (like a photodiode).

For a cool demo of this property, check out:

http://cs.nyu.edu/~jhan/ledtouch/index.html

and:

http://hackedgadgets.com/2006/04/14/led-touch-sensor/

 

[things]

the reason to get an led the same colour of the laser is that if you shine a red laser into a white led, the light has to get through all of the stuff that creates it, and also the efficiency changes

 

[Gayan Soyza]

http://hackedgadgets.com/2006/04/14/led-touch-sensor/

Wow what a cool video, I didn't notice until now.Now I'm even scared to touch my LED matrix as well.

So a LED can take as a input device as well.

 

[Badar]

Thank you all for your comments.
I've a little knowledge of electronics.But didn't do anything about wireless.
I want to insert some sensor circuit on my switch board having buttons to turn lights and fans on and off so that i have a remote control and when i press a button on the control a particular light should turn on and off.
As i don't have any experience with sensors or remote controls i just wanted to start it with this little project(may be).
When i press a button it sends IR or RF to a sensor attached with a LED 2mm in dia and it turns on.
I want a circuit diagram and its description if possible.

 

[things]

just google for ir activated relay or something along those lines. jaycar sells a kit that does this kind of thing

 

[Hero999]

You probably need a pretty powerful laser though, I don't think a 3mW laser pen would be enough to light a standard red LED.

 

[things]

You probably need a pretty powerful laser though, I don't think a 3mW laser pen would be enough to light a standard red LED.

a 3mw laser would probably just light the led, but not very brightly. i don't know for sure because i have only used a 30mw and 20mw green laser to do it