Spectrum Analyser Showcase: four styles from one microphone

Four Spectrum analysers on the LCDWIKI ES3C35P (3.5", 320 x 480, ESP32-S3), all fed from the board's own ES8311 microphone. Each one shows a different setup of the same widget. 1. Bars in a row: 12 wide bars with round tips. They run red to cyan from left to right and go yellow at the top when loud. White peak marks hold for a moment, then fall. 2. Half circle: 24 bars on a 180-degree arc, drawn as LED-style steps. They run orange to green round the arc, with small square peak marks. 3. Both ways: 32 thin bars that grow up and down from a centre line. They run violet to cyan, and a whole bar turns pink when it is loud. 4. Ring: 16 bars round a small hole. They run yellow to red round the ring and fade to white at the tips. Every analyser covers 60 Hz to 8 kHz on a log scale and redraws 20 times a second. The analyser can listen to the music player instead of the microphone. Every setting is explained at https://lcdwizard.com/docs/widget-spectrum. The Spectrum analyser is a Pro widget. This is an Arduino export with LVGL 9, and it has run on the board.