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Old 14-11-10, 08:04 PM   #1
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Lightbulb New Blue Led Idea

hi guys/girls

just thought of a really good idea to add to the blue led modifications - inspired by ford forums...

Blue leds in.....the air vents to give ambient lighting.

to develop this further, blue and red...blue for when cold is selected and red for hot!

this will show as a glow from the back of the vents - leds not seen

what do yas reckon?



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Old 14-11-10, 08:05 PM   #2
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could go as far as 3 colours...

red for hot
blue for cold
green for in the middle.



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Old 15-11-10, 09:00 AM   #3
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I've seen a tap that did this actually, looked quite cool

Not sure how you could do it though?
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Old 15-11-10, 10:50 AM   #4
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well for one colour it is really simple, piggy back of the ashtray light loom for the power.

for more than one colour that is where things get awkward. the positive connection could be from the same source as above, but the negative could be connected to an electrical switch attached to the temp controls somehow.

on my ford i have no tension wire controls, it all electronic so i can get the positive from, say the courtesy light constant and negative to the right part on the temp switch contacts, so when the temp dial is turned to that the circuit is made and the relevant light will show. but with pugs i know there tension wires so it could prove a little awkward.

i was just thinking aswell, you could even go as far as leds in all vents, that illuminate when those vents are on only even light intensity for how strong you have the blowers on.

more research is needed tho



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Old 15-11-10, 12:19 PM   #5
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Haha this is going to get interested

Surely the ligh intensity on a manual controls like mine would be easy, not sure how a electronic one would work though as power settings are probably a CAN signal to a controller, then on to motor

Maybe take a feed off motor if it isnt too high output?
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Old 15-11-10, 01:06 PM   #6
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i didnt think about the signal... i assumed tho, that there will be voltage difference in the speed selector and passing the different voltages over the leds will produce different intensities, obviously you will have to stay within the led voltage tolerances as you may burn them out or wont be enough to light them, leds really dont like dimming

im going to research this further and more than likely have a go...

me and my ideas



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Old 19-12-10, 07:13 PM   #7
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Well, boredom strikes... so here goes...

I'm going to make this sound really simple, clearly it's not,

but you could essentially make a self contained unit that could just live in the vent and have just a +12v wire going to it. that way it'll work in whatever car you have, whether wire controlled, or bus controlled. also makes it a bit easier to pull out if you sell the car. (to someone who doesn't want a car with lots of blue LEDs in it).

To measure air temperature, you'd just use a thermister.

To measure the amount of air flowing through the vents it'd going to require something like the MAF sensor, either a vane type, (basically a fan that'll spin a motor, then you'd measure the voltage produced to get the air speed in the vent),
or you could create a hotwire MAF sensor, (which would probably be the easiest thing to create for this). as you just need to use some resistive wire.

to vary the brightness you need to use pulse width modulation. basically flash the light on and off really quickly.

so to have 100% brightness you turn it on for 10ms out of every 10 ms
for 90% turn it on for 9ms then off for 1ms
50% bright on for 5milliseconds, off for five miliseconds.

you'll need to use somrthing like a PIC chip to get the readings from the homemade temp and maf sensor, and to do the PWM on the chip.


bad news is that this obviously has a steep learning curve...
the good news about this is, you can build a programmer like the JDM programmer for about 1. maybe 2 (that will let you program the chip)
the development software for programming the chip is free, and there are free compilers out there.
PIC chips can be obtained as "samples" for free from microchip.
a thermistor for the temperature sensor costs about 50p a roll of resitance wire from maplin costs 6, but you'd be able to make thousands of MAF sensors for that amount of wire
and a 5 volt regulator to power the chip.

all it need is power it should measure temperature, (to know what colour to display) and air flow itself (to know how brightly to display it).
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