const int servoPin = 18; // Servo on GPIO 18 
// Converts pulse width (in µs) to 16-bit duty cycle 
int pulseWidthToDuty(int pulseWidth) { 
return (pulseWidth * 65535) / 20000;  // 50 Hz -> 20 ms period 
} 
void setup() { 
ledcAttach(servoPin, 50, 16);  // PWM on GPIO 18, 50 Hz, 16-bit
}