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      08-08-2007, 05:41 PM   #1
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Electronics engineers? LED boost gauge

its a long shot but does anyone on the board have the schooling to create something similar to whats shown here http://www.audiworld.com/tech/elec42.shtml

it seems like it would be something very easy for someone who actually gone to school for it, looks like that sensor puts out varying volts depending on pressure which somehow gets translated to lighting up leds

if i had the parts in front of me i could probable put it together because i know my way around a soldering iron, but i have no idea how it actually works

it seems like it would be great though to use calibrated for 7-17 psi w/ say amber for 7-12 psi green for 13&14 and bright red for 16+17
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      08-08-2007, 05:53 PM   #2
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+1 That would be an excellent mod if we can get it on our cars..
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      08-08-2007, 05:58 PM   #3
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it'll look like knight ryder every time you drive fast
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      08-08-2007, 05:59 PM   #4
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Quote:
Originally Posted by modster View Post
+1 That would be an excellent mod if we can get it on our cars..
that guy gives a wiring diagram part numbers for everything you need ECT on that site so all that you would really have to do is solder parts, but where the heck would you get the PCB board made (the link he provides is dead)

but more importantly, i want to ask someone with more knowledge if you can calibrate it to a 10psi range (he has it @ a 20psi range 2 psi per LED which would be useless for us IMO) and it would work w/ 1 psi per led (or even a 5 psi range and .5 psi per led O_o)

seems like it would though, but im no electrical engineer

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Originally Posted by that guy nico View Post
it'll look like knight ryder every time you drive fast
nah if you look you'll see that you can have it so only one led lights up at a time (which is what i would use for sure)
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      08-08-2007, 06:14 PM   #5
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It wouldnt be hard to set it up to do .5 psi per LED but it would be a huge pain to order and put together all those pieces.
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      08-08-2007, 07:09 PM   #6
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should be easy. I can make 'em. Group buy?
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      08-08-2007, 07:10 PM   #7
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should be easy. I can make 'em. Group buy?
do you know of a good place to have PCB boards burned?
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      08-08-2007, 07:18 PM   #8
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my friend is making them
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      08-08-2007, 07:22 PM   #9
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do you guys mean like this?

http://www.e90post.com/forums/showthread.php?p=925542
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      08-08-2007, 07:26 PM   #10
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      08-08-2007, 07:42 PM   #11
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Here is a place to get cheap circuit boards made fast. http://www.expresspcb.com/ I have used them for small boards at work for test fixtures. The software is free to download and you send your order over the internet and can have your circuit boards in as little as 2 days for double sided boards.
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      08-08-2007, 08:45 PM   #12
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Quote:
Originally Posted by 533ogetnom View Post
its a long shot but does anyone on the board have the schooling to create something similar to whats shown here http://www.audiworld.com/tech/elec42.shtml

it seems like it would be something very easy for someone who actually gone to school for it, looks like that sensor puts out varying volts depending on pressure which somehow gets translated to lighting up leds

if i had the parts in front of me i could probable put it together because i know my way around a soldering iron, but i have no idea how it actually works

it seems like it would be great though to use calibrated for 7-17 psi w/ say amber for 7-12 psi green for 13&14 and bright red for 16+17


The question is; why would you want one..?
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      08-08-2007, 08:46 PM   #13
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Something like this is really simple in concept; you can get LED bargraph drivers dime-a-dozen (unless you get one from the rat shack, in which case they're a couple of bucks). Usually you can pin them for "moving bar" or "moving dot" (this application calls for the latter I think) and you just use one to display the voltage coming off of your pressure sensor. I'd bet you can find an appropriate signal in the ECU wiring harness so you don't need to change any plumbing. The trick with this route is that you need a temporary mechanical pressure gauge to calibrate your display; if you're using your own sensor you can get "close enough" from the spec sheet.
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      08-08-2007, 08:57 PM   #14
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Quote:
Originally Posted by BoostedInPhx View Post
Here is a place to get cheap circuit boards made fast. http://www.expresspcb.com/ I have used them for small boards at work for test fixtures. The software is free to download and you send your order over the internet and can have your circuit boards in as little as 2 days for double sided boards.
yea everything on the page is foreign to me though, know of any place i can be like "hey i have this file, turn it into a PCB board and ship it to me for cheap"

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Originally Posted by Garrett View Post
The question is; why would you want one..?
why would you want a boost gauge, uh how much do you want to read?
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      08-09-2007, 07:35 AM   #15
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I think its a neat idea in theory, but in execution will give you very limited data. You want exacting readings when it comes to boost. Something like this would be good for a shift light or air/fuel meter. However, I like my digital gauge showing me to the .1 accuracy. I know if something is funky with lines or pressure or whatever if I see a drop in what Im normally accustomed to. You cant tell if anything is wrong on that LED setup if you have 2psi per light. Even doubling the lights and having 1psi for each, thats still not accurate enough. Sorry.
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      08-09-2007, 07:42 AM   #16
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It doesnt look right on the BMW's panel...i prefer not having it at all.
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      08-09-2007, 10:12 AM   #17
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Quote:
Originally Posted by HyperM3 View Post
I think its a neat idea in theory, but in execution will give you very limited data. You want exacting readings when it comes to boost. Something like this would be good for a shift light or air/fuel meter. However, I like my digital gauge showing me to the .1 accuracy. I know if something is funky with lines or pressure or whatever if I see a drop in what Im normally accustomed to. You cant tell if anything is wrong on that LED setup if you have 2psi per light. Even doubling the lights and having 1psi for each, thats still not accurate enough. Sorry.
well as i said it loks like it can go down to one PSI per led (what i would do or even .5), FYI most sweeper motors tunacate to 1 psi; meening they ignore anything.x and read a ful psi, yes a digital boost guage like the one you have is good, but i dont want to deal with having to red it

im thinking with thisi wont even have to looks down and will be able to tell what color LED is lit just out of the cornr of my eye

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Originally Posted by Panoz View Post
It doesnt look right on the BMW's panel...i prefer not having it at all.
well, this all started because i couldnt find a gauge that had an icecubes chance in hell of loking in place, i couldnt even find a black faced orange backlit gauge :mad: ; theres a few diffrent places i found where it would be out of sight, you could even mount it inside the air vent without haveing to cut anything or blocking air flow!



but yea its deffintly not for everyone


edit: fing laptop im not even trying to correct al those errors
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