Control LEDs with Audio: A/D Converter & Microprocessor

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Discussion Overview

The discussion revolves around controlling LEDs in response to audio frequencies using a microprocessor with an A/D converter. Participants explore the methods for receiving audio signals, particularly through a microphone, and the necessary circuitry for filtering different frequencies.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant seeks guidance on controlling LEDs with audio frequencies, indicating familiarity with microprocessors and A/D converters but lacking knowledge on the overall implementation.
  • Another participant questions whether the audio signal is from a microphone or an electronic signal driving a speaker, suggesting that the latter could utilize existing schematics for graphic equalizers or lighting sequencers.
  • A participant clarifies their intention to use a microphone and expresses the need to determine the best type of microphone and methods for filtering frequencies.
  • There is a suggestion to use graphic equalizer circuitry with a microphone through a pre-amp, along with a reference to 'colour organs' from older electronics magazines.
  • One participant expresses confusion about the components they can use and mentions difficulties in understanding the circuits they have researched.
  • Another participant admits to a lack of experience with microprocessors and A/D converters, indicating that their contributions are speculative and hoping for more informed input from others.
  • A participant shares links to schematics for a VU meter and a light organ, which may be relevant to the discussion.

Areas of Agreement / Disagreement

Participants express varying levels of understanding and experience with the topic, leading to a mix of suggestions and uncertainties. No consensus is reached on the best approach or components to use.

Contextual Notes

Participants mention confusion regarding specific components and circuitry, indicating a lack of clarity on certain technical aspects and assumptions about prior knowledge.

Who May Find This Useful

Individuals interested in electronics, audio processing, and LED control, particularly those exploring DIY projects involving microprocessors and audio signals.

hsadan
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I am trying to control a bunch of LEDs to respond to different audio frequencies.

I have a microprocessor with A/D converter and know how to use these, but I have no idea how to go about the rest of it.

Thanks in advance!
 
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Do you mean for this thing to be responsive to an actual audible signal, as through a microphone, or simply the electronic signal that would drive a speaker?
I know nothing of electronics, but if it's the latter scenario I would suggest that you check into schematics for the bar graphs on graphic equalizers or the sequencers used by bands for their lighting effects.
 
I'm trying to do it through a microphone.

I have an idea of how I am going to control my LEDs, my main problem now is figuring out what is the best way to receive the audio signal (eg. what's the best type of microphone to use) and how to filter out the different frequencies.
 
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Hmmm... Would you then be able to still use the graphic equalizer circuitry by running your mike through a regular pre-amp?
I have plans somewhere for similar 'colour organs', but they're based upon transistors and small light bulbs (60's-70's Popular Electronics magazines):redface: .
 
sorry, to be honest I am completely lost as to what I could or could not use.

I did a quick search, and it does seem like I might be able to use similar circuitry.. the main problem is that so far, for all the circuits I've looked at, there are some parts of them I don't understand yet.
it's a little late right now so I can't really think, will look into it in the morning.

thanks for your help so far!
 
hsadan said:
sorry, to be honest I am completely lost as to what I could or could not use...
...thanks for your help so far!
Don't apologize... you know more than I do. I have no experience with microprocessors, and have never heard of a A/D converter.
As for the help, there really wasn't any. I'm just throwing out random ideas in the hope that one might be useful.
Once Berkeman and a few others weigh in, you'll have some real guidance.
 

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