LED to music

Projects Programming
1

I have a RGB LED and I have everything wired properly. I am looking for code that will make at least one LED go to music.

Here is some code I already have

 analogWrite(r,map(analogRead(A0),0,1023,0,255));

note I just have a audio signal connected directly to the analog input.

can some one recommend, create or teach me how to make an led blink to music nicely?

2

note I just have a audio signal connected directly to the analog input.

Audio data consists of positive and negative voltages. Supplying negative input to the Arduino is an excellent way to fry it.

3

You want:

  • Hardware *
    a) An amplifier to boost the audio signal to 0-5V
    b) A low-pass filter to cut out the high frequencies (just give you a "beat" signal) - can be combined with A
    c) Some way of removing the negative voltages so they don't overload your Arduino
  • or -
  • Software *
    a) Sample the audio for a short period into a buffer (may need an amplifier to boost it a little)
    b) FFT the data to give frequency buckets
    c) use the LED to display the value of one or more buckets of interest