Wire hookups and LEDs? - HobbyTalk
 
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post #1 of 4 (permalink) Old 02-28-2010, 01:56 PM Thread Starter
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Question Wire hookups and LEDs?

hi this is 10sparklebot, i am working on a project, and i have the LEDs, solder, a place to put the lights, and hook up wires. but i don't have resistors. Does anybody know the formula for figuring out the resistors needed?

Secondly, how do i put an on/off switch in between the wire to my battery and the wires to my LEDs? i am basically making a light fixture i guess. i am using a 6 volt battery, as long as i use resistors, the lights should last a while right? it wont drain the battery?
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post #2 of 4 (permalink) Old 03-02-2010, 12:14 PM
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It all depends on the current you want to use for the LEDs. You need to know the Voltage/Current requirement of 1 LED. Would be nice if you could post those values. Then I can lead you through the calculations. I think I've posted the before, but I'll be a nice guy and do 'em again .

In the meanwhile I'll draw a schematic for you, so you know how to wire that thing.

Greets

Tom
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post #3 of 4 (permalink) Old 03-03-2010, 11:55 PM Thread Starter
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Red face thanks

i actually found what i needed. Thank you! i was so confused at first. I burnt myself a few times though with the soldering gun like sometimes the solder sparked. ouch! now i just need to figure out how im gonna write a 2 pg paper about the optical principles and physics used with the piece. god i HATE PAPERS!!!!!!!
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post #4 of 4 (permalink) Old 01-21-2013, 02:01 PM
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If you do a google search for Single led calculator you will find an online tool that work out the value of the resistance for you given the forward voltage and current for the LED together with supply voltage.
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