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Thread: Looking to build a led gas pedal.

  1. #31
    Stu2008uk Newbie
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    Cheers guys, will get a lm3914 to play with, i've set the circuit up on the breadboard so we'll see if i get some pretty lights up and down with the pot lol!

    Stu


  2. #32
    Mikebits Excellent Mikebits Excellent Mikebits Excellent Mikebits Excellent Mikebits Excellent Mikebits Excellent Mikebits Excellent
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    Just to keep things ship shape and all that sort of thing I corrected an error, added a note for the jumper block, and updated the schematic. So here is the latest for your use
    Attached Images
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  3. #33
    Stu2008uk Newbie
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    Cheers Mike

    Stu

  4. #34
    Mikebits Excellent Mikebits Excellent Mikebits Excellent Mikebits Excellent Mikebits Excellent Mikebits Excellent Mikebits Excellent
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    Let us know how it turns out...
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  5. #35
    Mikebits Excellent Mikebits Excellent Mikebits Excellent Mikebits Excellent Mikebits Excellent Mikebits Excellent Mikebits Excellent
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    Oh, and here is a somewhat of a parts list. You need to pick your LEDS. Low current ones I would suggest.
    ------------------------------------------------------------------------
    Qty. Value Ref Des.
    1 .01uF C5
    2 .1uF C2 C4
    1 1.1k R2
    2 10k R4
    1 10k Pot R5
    2 2.2uF C1 C3
    1 2.4k R3
    1 20k R1
    20 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12
    D13 D14 D15 D16 D17 D18 D19 D20
    1 Molex J1
    2 LM3914 U1 U2

    For J1 look here.
    http://www.molex.com/product/cgrid/5547.html

    Can be ordered through Digi-key.
    Last edited by Mikebits; 8th August 2008 at 10:40 AM.
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  6. #36
    The Mad Professor Okay
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    Once your happy with the setup of the basic LM3914 circuit
    you will be delighted to discover that the chips can be cascaded to produce the desired result that you were looking for originally

  7. #37
    davidbball13 Good davidbball13 Good
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    Quote Originally Posted by Stu2008uk View Post
    Its purely for show and accuracy purposes, what I wish for the leds to do is something similar to this video when its put into the second stage via his mode change button http://www.youtube.com/watch?v=rs9oUvNfaBU

    All the best

    Stu
    if you could find a pot you could use a 3916 bargrapg display driver for it.

  8. #38
    Stu2008uk Newbie
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    Thanks for all the input guys really appreciate the help.
    See the +5v inputs, is that the max voltage a lm3914 will take, as it would have to run off 12v from the car.
    I'm such a newb at reading the circuit diagrams

    Stu
    Last edited by Stu2008uk; 9th August 2008 at 10:44 PM.

  9. #39
    jimmythefool Newbie
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    Stu, the datasheet says max 25v supply voltage

    Jim

  10. #40
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    Quote Originally Posted by Stu2008uk View Post
    Thanks for all the input guys really appreciate the help.
    See the +5v inputs, is that the max voltage a lm3914 will take, as it would have to run off 12v from the car.
    I'm such a newb at reading the circuit diagrams

    Stu
    Ugh, your correct in your thinking. You want twelve volts, but the circuit I gave was for 5V (Will work at twelve but components values may need to be changed). I kinda assumed you might use a 5v voltage regulator like
    http://www.national.com/mpf/LM/LM317.html

    The Auto voltage is rather a noisy world and straight 12-14vdc from the auto might cause noise issues in the circuit (Such as sporadic led operation). A regulator would help clean up the standard auto volts.
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  11. #41
    jimmythefool Newbie
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    Hi Stu,
    I found a PCB in my garage made by Maplin that is basically a 20 LED voltmeter based on 2 x LM3914.. Any use to you??

    Jim
    Last edited by jimmythefool; 14th August 2008 at 10:14 AM.

  12. #42
    Stu2008uk Newbie
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    Hey Jim,
    Yes im sure that could prove useful to me, it seems the LM chip i have has been shorted out by my brother when he was trying to build something else.

    Stu

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