Thread: blue interior led (pics)

Originally Posted by jacobmh27

How do you find out what Resistor to use by the VF?
and how do I get in contact with someone do mabey do this for me I want Blue as well

You use Ohm's law:

I=V/R

(I is current, V is voltage, R is resistance)

For our situation, we would reorder it to be R=V/I. So, the equation would look like this.

(14.4V-[Vf of LED])
------------------
[current of LED at Vf]

That will give you the resistor value in Ohms. I'd bump it up just a tad as well. For my 3.2V Vf LEDs, with 20mA of current, I use 620Ohm resistors.

As far as someone doing it, I've considered doing it for about $10 a switch (plus shipping, you provide the switches) but I've never opened Pontiac switches. I'd assume they're similar to the ones in the Impala/Monte, but I'm still learning those.

What's this company called BBE, that does the engine light clusters? do they have a website? or is there a How-to on doing the lights on all the dash pieces?

Originally Posted by Sabrewings

You use Ohm's law:

I=V/R

(I is current, V is voltage, R is resistance)

For our situation, we would reorder it to be R=V/I. So, the equation would look like this.

(14.4V-[Vf of LED])
------------------
[current of LED at Vf]

That will give you the resistor value in Ohms. I'd bump it up just a tad as well. For my 3.2V Vf LEDs, with 20mA of current, I use 620Ohm resistors.

As far as someone doing it, I've considered doing it for about $10 a switch (plus shipping, you provide the switches) but I've never opened Pontiac switches. I'd assume they're similar to the ones in the Impala/Monte, but I'm still learning those.

I was messing around on the internet trying to figure out the polarity of leds. I have a little project that I decided to mess with that includes leds and I ran across this calc for determining which resistor is needed. I am going to do the math myself personally to check this online calc after I wake up and after I get over the hangover that I will have.

Current limiting Resistor calculator for leds

The LED will have 2 legs, one longer than the other. The longer leg/lead is pos. If the polarity is reversed the LED will not light.