What is the simplest circuit for light music on Arduino?

Question

Arduino

You just need to blink to the beat of the music.

Answer 1

https://geektimes.ru/post/258424/
А вообще - можно обойтись и без ардуино:
antonkozlov.ru/gadzhety/svetomuzyka-svoimi-rukami.html

Answer 2

And so, in order to understand the words below, look at this:
Analog inputs
Analog outputs
And so our circuit will blink the LED to the beat of the music.
First you need to get data from the analog input (you can feed it to the minijack from your phone, but do not forget to put a current-limiting resistor. Connect the jack with one pin to ground and the other to the analog pin).
After receiving the data, write them to the analog output (connect the LED to the input, do not forget about the current-limiting resistor)
Done! You have received the simplest light and music installation, you can improve it if you wish.
If you have any questions, you can write.
Ps. If the information was helpful, don't forget to mark as "answer"