This article discusses the use of the ESP32’s GPIO to output digital signals such as PWM or Pulse Width Modulation or LEDC (LED Control), which enables frequency generation or adjusts the proportion of 1 and 0 states in 1 waveform. Thus, in the absence of the DAC, we can still adjust the average voltage at that pin as needed and it can be applied to control servo motors as well. Therefore, in this article, we will learn how to use PWM and apply it to frequency transmission instead of DAC (from the previous article) and LED dimming using the experimental board as shown in Figure 1.