Instead, he wound up assembling a custom bass reactive LED display using an ESP32. The entirety of the build is minimal, consisting of a GY-MAX4466 electret microphone module, a KY-040 encoder for ...

The hardware is a collection of modules on a custom PCB, aside from the ESP32 there’s an I2S microphone and I2S audio amplifier, which along with battery and speaker are housed in a neat 3D ...