Controlling a light-emitting diode (LED) with a ESP32 Third is the surprisingly simple task, especially when using one 1k load. The resistor limits the current flowing through one LED, preventing them from melting out http://theengineerstore.in/products/2-80w-100w-bluetooth-5-0-aptx-hd-tpa3116d2-power-amplifier-board-2-1-tpa3116-pcm5102a-dac-audio-ne5532-equalizer-class-d-amp