geekhack
geekhack Projects => Making Stuff Together! => Topic started by: . on Tue, 17 May 2016, 11:54:58
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Dude you got a cool name.
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LEDs need resistors not capacitors, what value you need would depend what the circuit you're putting them in is :)
What PCB do you have?
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It more depends on the LED even color of LED can change the resistor but anything between 220 to 1K. There are calculators out there to determine "assumed" current draw and voltage. But 220 are usually what I use when I buy cheapos from eBay (usually are brightest) I think Red LEDs will require larger because their luminosity is greater with a similar current to other colors. I have seen some SMD RGB LEDs where the R pin suggested resistance is different than G and B.
If you are lucky enough to know your part number you can probably find its datasheet online, sometimes the datasheet will suggest wiring and circuit values for you.
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If the PCB has one resistor per LED izilla is right, but there are other ways of wiring it up.
You also need to keep the total for all the LEDs and the controller under the 500mA supplied by a USB port - the datasheet may suggest values to run at the maximum safe value of 20mA per LED which would mean at full brightness you could only use 25 if the controller uses no power.
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