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Music driven bs2p40 — Parallax Forums

Music driven bs2p40

BoomboxBoombox Posts: 24
edited 2006-11-12 00:55 in General Discussion
whats up guys? So I'm trying to interface an LM3916 to a BS2P40 to make lights dance to the beat of music but it dosen't seem to be working. Any ideas? I'm connecting LED 10 from the LM3916 to one of the I/O's on the bs2p40. Help!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!


-Boombox
pdf
pdf
LM3916.pdf
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Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2006-11-09 06:36
    You're going to need to supply more information. What you've provided is not very helpful in explaining what you're trying to do and what you've tried so far.
  • BoomboxBoombox Posts: 24
    edited 2006-11-09 07:15
    So I sit in a loop until I see the signal change state then I change what lights are on. Here is the schematic. Unfortunatly all I see is a 0 on IN9. I never see it change state.
    bmp
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    VU meter and control box board 061026.bmp
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  • steve_bsteve_b Posts: 1,563
    edited 2006-11-09 17:29
    Is that PIN 9 of the BS2P40 or is that I/O 9? Are you using your own carrier board?

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    ·

    Steve

    "Inside each and every one of us is our one, true authentic swing. Something we was born with. Something that's ours and ours alone. Something that can't be learned... something that's got to be remembered."
  • BoomboxBoombox Posts: 24
    edited 2006-11-09 17:34
    It is I/O 9. I had my own printed circuit board made. Here is it's schematic.
    bmp
    bmp
    BS2P40.bmp
    866K
  • steve_bsteve_b Posts: 1,563
    edited 2006-11-09 23:28
    uhm....how about attaching your code to start.
    I'm looking at your diagram and am unsure which "9" you are talking about. There's pin 9 of the stamp (which is P4) and then there's P9 (which is pin 14)....but then you go your own header....

    I'm using FIREFOX on a mac and can't seem to download/open your pdf....bizarre!

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    ·

    Steve

    "Inside each and every one of us is our one, true authentic swing. Something we was born with. Something that's ours and ours alone. Something that can't be learned... something that's got to be remembered."
  • Fe2o3FishFe2o3Fish Posts: 170
    edited 2006-11-10 01:36
    Boombox,

    Oh, could you be having the BS2p40 playing music with SOUNDOUT commands? Ah, if that's true
    you'll need to low-pass filter the output of the BS2 since its ""music" is produced with PWM and not a
    nice "analog" signal which the 3916 wants to have on its input. In this case, probably best to add a
    low-pass filter to the output pin of your BS2 before feeding that output to your 3916.

    Keep in mind that some level adjustment may be needed, say with a resistor divider (if the output is
    too high of a voltage) or an op amp (if the output is too low). The main thing here is to read that
    datasheet for the 3916 and see what voltage levels it is expecting!

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    -Rusty-
    --
    Rusty Haddock = KD4WLZ = rusty@fe2o3.lonestar.org
    **Out yonder in the Van Alstyne (TX) Metropolitan Area**
    Microsoft is to software what McDonalds is to gourmet cooking

    Post Edited (Fe2o3Fish) : 11/10/2006 1:43:39 AM GMT
  • BoomboxBoombox Posts: 24
    edited 2006-11-11 06:25
    No, I'm using the LM3916 to trigger an input on the BS2P40. Then the BS2P40 changes the lights. Lets say we use Justin Timberlakes song "Sexy Back". It's got a back beat·of about 30 Hz at 125 Beats per minute. Every time the beat hits the LM3916 LED10 should go to ground and the BS2P40 interpretts that as an trigger to change what lights are on.



    Any ideas?

    Thanks!
    Boombox
  • BoomboxBoombox Posts: 24
    edited 2006-11-11 07:10
    Nevermind everyone I figured it out. If I role my supply voltage down to 5 volts and put a 10k pull-up on the line the signal becomes nuttin but butta!!

    Thanks everyone!
    Boombox
  • Fe2o3FishFe2o3Fish Posts: 170
    edited 2006-11-12 00:55
    Glad you got it working, Boomie! smile.gif

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    -Rusty-
    --
    Rusty Haddock = KD4WLZ = rusty@fe2o3.lonestar.org
    **Out yonder in the Van Alstyne (TX) Metropolitan Area**
    Microsoft is to software what McDonalds is to gourmet cooking
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