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Play3er2
09-08-2018, 12:12 PM
Hey guys, sorry for the noob question etc etc

I'm looking to use a pico crumble board with this (http://www.thecustomsabershop.com/Cree-Star-LED-MHSV1-Heatsink-Module-P998.aspx?ItemId=8189960&Kits=558,561,778,925,977,979,1100) prebuilt led module, and i have two questions:


Will i need a resisitor? My calculations say yes but i want to double check
How will wiring it work? I noticed the prebuilt led module has a male jst connector so i assume i will need a female jst connector, but how does that fit into wiring with the pico, especially RE resistors?




Thanks guys,
J

welshm85
09-08-2018, 12:18 PM
Since you will have to solder the board anyway, why not just get the led, module, heat-sink, and lens separately?

Play3er2
09-08-2018, 12:18 PM
I have just realised I placed this thread in totally the wrong place

Play3er2
09-08-2018, 12:19 PM
Since you will have to solder the board anyway, why not just get the led, module, heat-sink, and lens separately?

Ease of use basically

welshm85
09-08-2018, 12:21 PM
But to answer you main original question, yes you will need a resistor for a red led. I'm sure you have utilized a resistor calculator and have come up with the necessary resistor.

welshm85
09-08-2018, 12:22 PM
Ease of use basically
I can see that. Especially if you wanted to swap the led color between say, red and blue.

welshm85
09-08-2018, 12:26 PM
If you are going to swap the led out, I would see if you could get the resistor pre-wired on to the module above the jst connector.

Play3er2
09-08-2018, 12:29 PM
Hey guys, sorry for the noob question etc etc

I'm looking to use a pico crumble board with this (http://www.thecustomsabershop.com/Cree-Star-LED-MHSV1-Heatsink-Module-P998.aspx?ItemId=8189960&Kits=558,561,778,925,977,979,1100) prebuilt led module, and i have two questions:


Will i need a resisitor? My calculations say yes but i want to double check
How will wiring it work? I noticed the prebuilt led module has a male jst connector so i assume i will need a female jst connector, but how does that fit into wiring with the pico, especially RE resistors?




Thanks guys,
J


I can see that. Especially if you wanted to swap the led color between say, red and blue.

actually tell you what, i'll get the bits separately. which answers question 2.

so. will i need a resistor? it's a warm colour so i assume yes. What size? My calculations are:
Red Cree @TCSS – 2.65V 1000mA
Power Supply – 3.7V
R =(3.7-2.65)/1
R=1.05: Next highest resistor value =2Ω
P=3.7*1
P=3.7

and then i get lost. so i need a 2ohm resistor at what wattage?

welshm85
09-08-2018, 12:36 PM
That depends on the led and your battery. What is your battery set up?

Play3er2
09-08-2018, 12:38 PM
(edited for calculations)

Play3er2
09-08-2018, 12:39 PM
That depends on the led and your battery. What is your battery set up?


added my current resistor calculations. I'm going to be using a single cell 3.7v lion pack

welshm85
09-08-2018, 12:41 PM
This (http://led.linear1.org/1led.wiz/) is the calculator that I use.

welshm85
09-08-2018, 12:43 PM
I have used 1 ohm 2 watt resistors for my reds in the past while running off of a 3.7 volt.

Play3er2
09-08-2018, 12:43 PM
This (http://led.linear1.org/1led.wiz/) is the calculator that I use.


huh. none of the calculator links in the stickied post about calculating resistance worked. this works fine.

Thanks :)

Play3er2
09-08-2018, 12:44 PM
I have used 1 ohm 2 watt resistors for my reds in the past while running off of a 3.7 volt.


gotcha :)

Forgetful Jedi Knight
09-08-2018, 12:45 PM
Iíll just leave this here, since everyone sees me to have raced right past it...
http://forums.thecustomsabershop.com/showthread.php?17109-Tutorial-FJK-s-quot-Down-and-Dirty-quot-guide-to-Ohm-s-Law

Play3er2
09-08-2018, 12:49 PM
I’ll just leave this here, since everyone sees me to have raced right past it...
http://forums.thecustomsabershop.com/showthread.php?17109-Tutorial-FJK-s-quot-Down-and-Dirty-quot-guide-to-Ohm-s-Law


Hands up will admit i missed that. read the sticked "calculating resistance" thread, but not that one. whoops!

welshm85
09-08-2018, 12:49 PM
I’ll just leave this here, since everyone sees me to have raced right past it...
http://forums.thecustomsabershop.com/showthread.php?17109-Tutorial-FJK-s-quot-Down-and-Dirty-quot-guide-to-Ohm-s-Law

Thank you FJK for sharing this. I knew I saw something somewhere in relation to Ohm's law but couldn't find it.