First build; Tri-Cree, Biscotte, FoC, Recharge. Would like 2nd opinion on my wiring

[Judas]

Hello folks. I think I've done my due diligence, read the threads/tutorials on wiring here, also watched just about all the videos TCSS has to offer. Putting together a build and I'm about 90% sure on it, would just like a second opinion from the Lightsaber Gurus if the wiring is right and if I have the correct resistors. I'd really like to figure out all the parts I need so I can order chassis parts, size it up, then order the saber MHS.

I've followed the Flash on Clash video (https://www.youtube.com/watch?v=ZldjWimMAvE) for majority of the wiring. As well as the Building a Basic Saber parts 1 (https://www.youtube.com/watch?v=pOpUSCsXXhk) and 2 (https://www.youtube.com/watch?v=sApB7J5JdZ4) for more reference. Used Wiring a Recharge Port (https://www.youtube.com/watch?v=wemK6SD0Imo) for more information. Just may have changed the colors around and added in an Anti Vandal Switch.


I used this website to help calculate the resistors; http://ledcalc.com/#calc

>> 2 Red Cree in Parallel 2.59v @ 1000mA from 3.7v Battery = 0.554 Ohms 2w

R = (3.7 - 2.59) / 1.00 = 1.11 Ohms
Rt = 1 / ( 1/1.11 + 1/.11 ) = 0.554 Ohms
Closest resistor .5 Ohms 3w

>> Anti Vandal Switch 2.0v @ 20mA on the 3.3v Pad = 65 Ohms 1/8 watts

R = (3.3 - 2.0 ) / .02 = 65 Ohms
Closest resistor 68 Ohm 1/8w
In the Biscotte Manual Page 13 it says that spot has a 3.3v output and powers off during sleep :)


http://i.imgur.com/C6bufhE.png



Part list; (clicky links)
- Red/Red/White Cree XP-E2 CopperNova (http://www.thecustomsabershop.com/RedRedWhite-Cree-XP-E2-CopperNova-P1014.aspx)
- Power Xtender? 2.0 (http://www.thecustomsabershop.com/Power-Xtender-20-P652.aspx)
- 16mm Anti Vandal Short Momentary Red Ring Switch (http://www.thecustomsabershop.com/16mm-Anti-Vandal-Short-Momentary-Red-Ring-Switch-P908.aspx)
- Premium 28mm Speaker (http://www.thecustomsabershop.com/Premium-28mm-Speaker-P77.aspx)
- MWS Recharge Port (http://www.thecustomsabershop.com/MWS-Recharge-Port-P877.aspx)
- Nano Biscotte Sound Module V2 (http://www.thecustomsabershop.com/Nano-Biscotte-Sound-Module-V2-P806.aspx)
- Panasonic Li-Ion 18650 3.7V 3400mAh PCB Protected Rechargeable Battery (http://www.thecustomsabershop.com/Panasonic-Li-Ion-18650-37V-3400mAh-PCB-Protected-Rechargeable-Battery-P853.aspx)

[Forgetful Jedi Knight]

Well, the diagram is basically good. If you are going to wire LEDs in parallel, it's a good idea to put a resistor on EACH LED. Also when doing your resistor calculations, you are using some wrong values. You would want to run the Reds at 1A (If you want them bright).

[Ty_Bomber]

I will echo FJK here and confirm that the led can, and should be run at 1 amp. The spec sheet on the cree sits makes it seem like 350 mah is the preferred current, but it will be under driven for our purposes.

[Judas]

Thanks guys, I changed around the image and my post. Looks like I can use the .5 Ohm 3w resistor from the store!

http://www.thecustomsabershop.com/5ohm-3w-resistor-P1050.aspx

[Grimlock84]

Add separate resistor for the other led run in parallel like this.

11761

Sorry it's not that pretty... I did it on my phone.

You should also put a resistor on your FOC led to be on the safe side.

[Noyl Wendor]

So a .5ohm 3watt resistor would be enough for both Red LED's in parallel? Only asking because I decided to use a tri-cree as the one above is described. I used the same calculator and came up with 1.2ohm 1 watt resistor.
when I did it with out the calculator I came up with the same, only I was going to use a 3watt. When connected to the same red (as above) its not as bright. This caught my eye and I saw the .5ohm 3watt in the store.
The alternative is a 1ohm 2watt, but I don't think the LED will have the same life

[Miraluka]

So a .5ohm 3watt resistor would be enough for both Red LED's in parallel? Only asking because I decided to use a tri-cree as the one above is described. I used the same calculator and came up with 1.2ohm 1 watt resistor.
when I did it with out the calculator I came up with the same, only I was going to use a 3watt. When connected to the same red (as above) its not as bright. This caught my eye and I saw the .5ohm 3watt in the store.
The alternative is a 1ohm 2watt, but I don't think the LED will have the same life

Most everybody here is going to advise you to use a separate resistor for each LED in parallel. It is the safer, more reliable option and it's only going to cost you like $0.66 to put the second resistor in there. I would not use a single resistor for both.

[Bark]

Most everybody here is going to advise you to use a separate resistor for each LED in parallel. It is the safer, more reliable option and it's only going to cost you like $0.66 to put the second resistor in there. I would not use a single resistor for both.

Here's an elegant explanation (http://electronics.stackexchange.com/questions/22291/why-exactly-cant-a-single-resistor-be-used-for-many-parallel-leds) as to why.

[Miraluka]

Here's an elegant explanation (http://electronics.stackexchange.com/questions/22291/why-exactly-cant-a-single-resistor-be-used-for-many-parallel-leds) as to why.

Nice. I feel like that should be added to a sticky or something.

[Noyl Wendor]

I can see how the "elegant explanation" works, its well explained in the link above. So I've got no trouble using either method. Though now that I have tried both. I will say there is a somewhat noticeable difference in brightness in LED's between the two. Not much, but for the sake of a long lasting LED I'm not opposed to wiring each with their own resistors. Nor am I opposed to using a single resistor for one set of LED's in parallel.
I'm sure for some its preference, I'm going with what ever gets the most out of the LED, in brightness and life of the LED. Plus, its always a boon to learn new ways of doing things.
Thanks for the reply and info ;)
Sorry Judas for jacking your thread, I hope this helps your first saber build :D

[Judas]

I don't take it as hijacking, I'm reading and learning as much as I can. Any help is much appreciated :)

The only problem is.. the more I read.. the more and more stuff I want to add :D

[erlomd]

so what ever happened? I just purchased a tri cree in blue/blue/white...did the calculations and this is what I get from the calculator:

13069

will it work? sorry to revive an old thread but its very good;)

[Silver Serpent]

Calculations will work.