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Today I’d like to share how to make an audio spectrum analyzer - 36 bands by combining 4 LoL Shields together. This crazy project uses a FFT library to analyze a stereo audio signal, convert it to frequency bands, and display amplitude of these frequency bands on 4 x LoL Shields.

The main electronic components are as below:

4pcs x Arduino Uno R3.
4pcs x LoLShield PCB. PCBWay (Full feature custom PCB prototype service) supported me these LoLShield printed circuit boards.
504pcs x LED, 3mm. Each LoLShield needs 126 LEDs and we can choose 4 different led colors & types (diffused or non-diffused).
1pcs x Portable Charger Power Bank Battery 10000/20000mAh.
4pcs x Male Header 40pin 2.54mm.
2pcs x USB Type A/B cable. One is used for Arduino programming, the other is for powering the Arduino from a power bank.
1pcs x 3.5mm Female Stereo Audio Jack.
1pcs x 3.5mm 1 Male to 2 Female Audio Splitter Adapter.
1pcs x 3.5mm Stereo Audio Jack Male-Male Connector Cable.”

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