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Student in need of LED lighting help!!

 
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Toby
Newbie


Joined: 01 Dec 2006
Posts: 3

PostPosted: Fri Dec 01, 2006 9:02 am    Post subject: Student in need of LED lighting help!! Reply with quote

Hi Guys (and girls), i am currently doing a lighting project at uni, involving leds. I'm useless with electronics, and everyone i ask seems to not know what they are talking about.
Basically my design involves four 'pods'. Each pod 'will' have two super bright leds, powered by a rechargeable battery. The pods, will charge off the main base. (i.e. four pods charging from a mains powered base.) The idea is for the pods to be on when they are in the base, then when removed, they can be switched on or off. (portable ligh source in other words)
How do i go about wiring a cirucit for this (i know the two leds in each pod have to be in series, and the pods have to be in parallel, but thats all i 'know')
I know it is complicated, but time is running out!
Any Helpers PLEASE.

Toby (DeMontfort Uni)
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Nginuity
HG Ruler


Joined: 13 Nov 2006
Posts: 224
Location: Dallas, Texas

PostPosted: Fri Dec 01, 2006 11:16 am    Post subject: Reply with quote

Can you give specs on the LED's you want to use? As in, voltage draw, and how much current they use?
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Toby
Newbie


Joined: 01 Dec 2006
Posts: 3

PostPosted: Sat Dec 02, 2006 9:29 am    Post subject: any info is greatly appreciated! Reply with quote

Thanks Nginuity...That would be really good of you...erm don't know how to go about doing it but, my email address is kingp_toby@hotmail.com.

I tried to get some parts today to start making this circuit, and the guy at maplins basically just laughed at me!lol...think i'm being a bit too ambitious so may have to change the way this light works. In terms of info, anything is helpful!!

Thanks again
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Alan
Site Admin


Joined: 29 Jan 2006
Posts: 1399
Location: Winnipeg, MB

PostPosted: Sat Dec 02, 2006 11:07 am    Post subject: Reply with quote

If I am getting the concept right all you will need to do is use some diode blocking in your charging circuit.

I haven't wired this up but if you have a 2 terminal charging connection to each pod.
* Then take the negative of the charging power and common it to the cathodes of the LEDs and to the negative of the battery you are wanting to charge.
* Next take the positive through a series diode and current limiting resistors (one per LED) to the anodes of the LEDs. This will allow the LEDs to be turned on when the unit is plugged in.
* Lastly take the positive of the charging power through a diode and a charge current limiting resistor to the positive of the battery.

And then of course you will have current limiting resistors and switch on the pod going from the battery positive to the anodes of the LEDs to turn it on using battery power.

Again I haven't wired this up but it "should" work out of the box... Cool
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Toby
Newbie


Joined: 01 Dec 2006
Posts: 3

PostPosted: Sat Dec 02, 2006 1:54 pm    Post subject: Thanks Alan... Reply with quote

Thanks Alan...like i say, i know little about LEDs etc etc, but what you said sounds at the very least, feasible!...I'll have to see what i can do with what you have recommended...at the end of the day, its all about trials, and test rigs, till you get what you want, and this could well be the start of that process.
I will let you know, how it goes (if at all.lol) but any other recommendations are greatly appreciated.
Thanks again!
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