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TOPIC: RGBA LED and Resistors Help please?
RGBA LED and Resistors Help please? 5 months 3 weeks ago #68227
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Read a lot of LED related post but I might have missed some items.
I just like to know about RGBA LED, what are the resistors ohms needed so I dun blow up the soundboard. And also I heard LED switch button also require resistors, I am worried about blowing the sound board up. So I gotten a breadboard and working them on it first before doing the actual soldering. Hope can get some advice on the resistors. |
RGBA LED and Resistors Help please? 5 months 3 weeks ago #68228
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JazzKin77 wrote:
I do not know how to search for the specific topic at the moment.
I had it drafted easier for you with embedded link, where all you had to do was click it to open up a new tab at the index.
Read a lot of LED related post but I might have missed some items. I'm not knowledgeable enough to answer your specific query however can relocate it to the Forums section where others more experienced may. I just like to know about RGBA LED, what are the resistors ohms needed so I dun blow up the soundboard. And also I heard LED switch button also require resistors, I am worried about blowing the sound board up. So I gotten a breadboard and working them on it first before doing the actual soldering. Hope can get some advice on the resistors. 
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The following user(s) said Thank You: JazzKin77
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RGBA LED and Resistors Help please? 5 months 3 weeks ago #68248
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Depends a little bit on the sound board and what your battery is but...
In general: RED and AMBER LEDs need a 1ohm 1-2 watt resistor on them. Green usually doesn't Blue usually doesn't need one, but you do end up pushing a little more juice through them without one. |
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The following user(s) said Thank You: JazzKin77
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RGBA LED and Resistors Help please? 5 months 3 weeks ago #68272
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Like to check.
Then how about those LED on/off switches? Do they need resistors as well?? I have 1 yellow and 1 purple LED lit switch each. 12w RGBA LED x1 NCR18650B Panasonic 3400mah battery x1 The Spark Color 2 soundboard by NEC x1 Lit momentary switches 12mm Yellow x1 Lit momentary switches 12mm Purple x1 I'm trying to DIY fix up the circuits for a silver knight hilt. But I am using 2 lit momentary switches n wanting to add a recharge port. Not sure if it is workable. First timer n rather ambitious about it 
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RGBA LED and Resistors Help please? 5 months 3 weeks ago #68353
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Switch LEDs also need to be resistored, and this process could potentially involved some not-too-complex calculations detailed in the Spark 2 manual. Or you could grab some DynaOhm resistors from TCSS that can dynamically adjust to ensure a constant 20mA current draw and save some of the hassle of finding proper resistors
You would need to wire one per each lit switch.
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The following user(s) said Thank You: JazzKin77
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RGBA LED and Resistors Help please? 5 months 3 weeks ago #68363
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Snakeeyz99 wrote:
Switch LEDs also need to be resistored, and this process could potentially involved some not-too-complex calculations detailed in the Spark 2 manual. Or you could grab some DynaOhm resistors from TCSS that can dynamically adjust to ensure a constant 20mA current draw and save some of the hassle of finding proper resistors
You would need to wire one per each lit switch.
^^^^^^ YES! Use the DynaOhms. They make life easy. |
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The following user(s) said Thank You: JazzKin77
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RGBA LED and Resistors Help please? 5 months 2 weeks ago #68412
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So if I have a SF RGBW LED die alogn with the SF supplied 3.7V battery and a spark 2 board....would 5 dynaOhms (4 for the LED and 1 for the lighted switch) be sufficient to DIY the electronics kit?
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RGBA LED and Resistors Help please? 5 months 2 weeks ago #68427
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The DynaOhms are only good for accent and switch LEDs since they adjust the current to 20mA. For the main LEDs you'll require 1A per die. In that case, you'll either need to calculate and purchase the proper resistors or use the same values that SF uses in their kits. The plus side is you don't need to worry about the green and blue die since they can handle being overdriven, so you just need to resistor the red and amber die.
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RGBA LED and Resistors Help please? 5 months 2 weeks ago #68490
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Thanks for the response! What about a white die?
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RGBA LED and Resistors Help please? 5 months 2 weeks ago #68500
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bongo6116 wrote:
Thanks for the response! What about a white die?
Here's the voltage specs on the XP-E2 LEDs: You CAN put a resistor on Blue and White, but typically they handle the extra voltage as long as you have them in a good heatsink (which you should). White @ 1000ma = .55ohm .55 watt (.47ohm is what you will likely find which will be fine) Don't worry about blue. |
RGBA LED and Resistors Help please? 5 months 2 weeks ago #68506
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Jas-Ot wrote:
bongo6116 wrote:
Thanks for the response! What about a white die?
Here's the voltage specs on the XP-E2 LEDs: You CAN put a resistor on Blue and White, but typically they handle the extra voltage as long as you have them in a good heatsink (which you should). White @ 1000ma = .55ohm .55 watt (.47ohm is what you will likely find which will be fine) Don't worry about blue. Just a quick note: according to ShopSaberParts, the 12W+ modules sold there use Cree XQ-E LEDS. The values for the forward voltages at 350mA are the same so the value at 1A should be fairly close (though they aren't given on the XQ-E datasheet unless you want to translate a graph), so Jas-Ot's statement is still correct. Just a small housekeeping thing that took me a while to realize, because until ShopSaberParts launched I had assumed they were XP-E2 LEDs as well. I think they ended up going XQ-E because they are roughly a quarter of the size and they would be able to comfortably use a one-up lens with 4 of them. |
RGBA LED and Resistors Help please? 5 months 2 weeks ago #68518
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They have the same specs, the XP-E2 table is just easier to read.
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RGBA LED and Resistors Help please? 5 months 2 weeks ago #68519
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While I can't guarantee they're the same specs, I do personally use the XP-E2 voltages for calculations on SF LEDs. I figure if they match up at 350mA, chances are good they'll match at 1000mA.
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RGBA LED and Resistors Help please? 5 months 2 weeks ago #68521
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There's an XQ-E PDF out there (for the life of me I can't find right now) that shows the 1000ma voltages, just not as easily readable, and they are virtually the same.
EDIT: Found the PDF |