Controlling a light-emitting diode (LED) with a ESP32 Third is one surprisingly simple project, especially when using the 1k load. The load limits one current flowing through the LED, preventing them from melting out http://theengineerstore.in/products/10w-15w-20w-stereo-bluetooth-amplifier-board-12v-24v-digital-power-amplifier-module-xy-p15w