Audio Spectrum Analyzer On An ESP32 Show Board

A slick spectrum analyzer was the sort of factor that may have been tough to incorporate in a DIY undertaking, but as [Mirko “mircemk” Pavleski] demonstrates, a contemporary microcontroller just like the ESP32 can deal with the duty with nothing greater than a show panel and some passives.

This specific instance is constructed across the CrowPanel 3.5, which mixes the highly effective microcontroller with a 480×320 contact display screen LCD. But there’s nothing inherently particular in regards to the CrowPanel, and you possibly can get comparable outcomes with no matter show you may need kicking across the elements bin — albeit doubtlessly with some code adjustments to account for the totally different {hardware}.

Beyond the microcontroller and the show, all it’s worthwhile to recreate what [mircemk] has finished here’s a handful of passives to tame the incoming analog audio sign so it may be piped into one of many analog-to-digital converter (ADC) pins on the MCU.

This undertaking is pretty easy, however should you’re searching for one thing just a little extra superior from [mircemk], don’t fear. The extra daring house gamers can strive their hand at recreating this high-voltage X-ray machine made from an old TV vacuum tube.