The SparkFun Spectrum Shield enables Arduino projects to react to sound by splitting stereo audio into seven frequency bands per channel, making it ideal for audio visualisers, interactive lighting, and sound-reactive projects.
The SparkFunSpectrum Shield equips your Arduino device to split a stereo audio input into seven distinct frequency bands per channel. By reading the amplitude of each channel using your Arduino's analogue-to-digital converter (ADC), you can trigger physical hardware such as LEDs and motors, or even pumps and relays, based entirely on sound.
Pass-Through Audio and MSGEQ7 Filters
At the core of this board are two MSGEQ7 graphic equalizer display filter ICs that process the incoming audio signals. To make adding this shield to an existing setup as simple as possible, we designed it to sit directly in your audio path.
In-Line Pass-Through: Features two 1/8-inch stereo jacks (the standard headphone jack size). One acts as your audio input, while the second provides a pass-through output, allowing you to place the shield directly between your audio source and your stereo system without interrupting the music.
Standard R3 Layout: The board utilizes the standard Arduino R3 footprint for easy physical compatibility with your microcontroller.
Customizable Assembly: The shield arrives without pre-soldered headers, allowing you to select and solder the exact pin style your specific project requires.
Whether you are building an interactive art installation or a reactive fire-breathing prop, this shield enables your project to physically respond to audio input. There are plenty of projects out there using the Spectrum Shield, so do a bit of searching if you need some more inspiration!
Features
Splits stereo audio input into seven distinct frequency bands per channel
Features two MSGEQ7 graphic equaliser filter ICs for audio processing
Two 1/8-inch stereo jacks for in-line pass-through audio connectivity
Compatible with Arduino devices using standard R3 layout
Reads amplitude of each frequency band via Arduino's analogue-to-digital converter
Trigger physical hardware including LEDs, motors, pumps, and relays based on sound
Ships without pre-soldered headers for customisable assembly
Sits directly in audio signal path without interrupting playback
Specifications
Audio Processing:
2x MSGEQ7 graphic equalizer display filters
Frequency Splitting: Seven bands per stereo channel
Output: Analog amplitude readings for direct ADC connection
