#Led music visualizer program software#
#Led music visualizer program code#

If you input an array of N real samples (i.e. We actually extract frequency information using a Fast Fourier transform (FFT).

#Led music visualizer program code#

This code is device specific, so you will need to modify these settings to work on your own microcontroller if you don't utilize an ATmega328-based board. Credit to this tutorial for the register manipulation code. The Arduino function analogRead is too slow for this, so we must manipulate some microcontroller registers to access analog to digital converter (ADC) data directly. If we want to capture audio signals, which contain meaningful frequencies to about 20 kHz, we need to sample at a rate greater than 40 kHz. The Nyquist Sampling Theorem dictates that in order to capture a signal you need to sample it at least twice as fast as the fastest-varying components of the signal.

#Led music visualizer program software#

One item to note about the software is sampling. This software requires the following libraries, both of which can be installed directly from the Arduino library manager: You can find the software in the attachments section, and here on GitHub. If you do this, however, note that you will likely need a power source that can supply a great deal of current (3+ amps).

Using Multiple Strips: It's certainly possible to connect multiple LED strips together.

If the audio is not amplified and the level is not shifted you likely won't have great results. If you use a different module it might not accomplish both these tasks, so be careful.

Level-Shifted Audio Output: This SparkFun module is nice because it has components to both amplify audio from the microphone and center the audio level at half the supply voltage.

For this reason, I recommend powering your lights with a separate power supply. I attribute this to the LED strip causing voltage swings.

Separate Power Supplies: I found that when the lights were hooked up to the same power source as the microcontroller the sound analysis became extremely noisy.

Ensure that you connect the right end - there's an arrow that indicates in which direction the data must flow. You can insert jumper wires directly into the female connector pins to connect this. Red is power in, ground is data in, and white is ground.

Connecting the LED Strip: The SparkFun LED strip listed uses red, green and white wires.

Microcontroller A0 -> Microphone Module Audio Out.

Microcontroller Pin 2 -> LED Strip Data In.

Microcontroller Ground -> Microphone Module Ground.

Microcontroller 5V Output -> Microphone Module Vin.

5V Power Supply -> Barrel Jack -> LED Strip Ground & Microcontroller Ground.

5V Power Supply -> Barrel Jack -> LED Strip Vin.

See the diagram above for more details, but the basic connections are listed below: As you can see, the circuit is not particularly complicated.