https://wak-tech.com/archives/780
https://www.mgo-tec.com/blog-entry-ledc-pwm-arduino-esp32.html
https://lang-ship.com/blog/?p=667
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http://mh.nodebb.com/topic/8/mh-et-live-minikit-for-esp32
https://ht-deko.com/arduino/esp-wroom-32.html
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