Feature:1. The filter board can be used to create an audio analyzer to track the frequency information of music so that your controller can interact with the music.2. Used to capture the music spectrum, make music interactive robots, process audio data reading, make lighting special effects, voice analysis, etc.3. The typical amplitude of the input signal is required to be 20dB, and a potentiometer that can adjust the input amplitude is provided.4. The audio signal will be filtered into 7 frequency bands through this module, namely 63Hz, 160Hz, 400Hz, 1kHz, 2.5kHz, 6.25kHz and 16kHz.5. The filter board is driven by 2 digital ports and 1 analog port, and is equipped with cables and audio plugs for easy operation.Specification:Item Type: Filter BoardMaterial: PCBWorking Voltage: 5VDrive Interface: 2 x digital port, 1 x analog portPrinciple: Audio processing is an audio signal analysis IC based on MSGEQ7 graphic equalization filter. The audio signal will be filtered into 7 frequency bands through this module, and can output the amplitude of each frequency band. The 7 frequency bands are 63Hz, 160Hz, 400Hz, 1kHz, 2.5kHz, 6.25kHz and 16kHz..Package List:1 x Filter Board1 x Cable1 x Audio Plug11 x Module Accessories1 x Wiring DiagramNote:Please use within the parameter voltage range.