Wiring
Check pinout, power supply, common GND and voltage levels before connecting the module.
Full code
const int pwmPin = 18;
const int channel = 0;
void setup() {
ledcSetup(channel, 5000, 8);
ledcAttachPin(pwmPin, channel);
}
void loop() {
ledcWrite(channel, 80);
delay(1000);
ledcWrite(channel, 220);
delay(1000);
}How it works
This lesson matches the page title and gives a clean starting point for this exact example.
Common mistakes
Check board selection, wiring, libraries, power supply and serial monitor baud rate.