First init.

esptest/esptest.ino

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+const int potPin = 10;   // Analog pin for potentiometer input
+const int pwmPin = 39;    // PWM pin for output
+const int ledPin = 15;   // Built-in LED pin
+
+void setup() {
+  // Initialize serial communication for debugging
+  Serial.begin(9600);
+
+  // Set PWM pin and LED pin as outputs
+  pinMode(pwmPin, OUTPUT);
+  pinMode(ledPin, OUTPUT);
+}
+
+void loop() {
+  // Read the value from the potentiometer
+  int potValue = analogRead(potPin);
+
+  // Map the potentiometer value (0-1023) to PWM range (0-255)
+  int dutyCycle = map(potValue, 0, 1023, 0, 255);
+
+  // Output the duty cycle
+  analogWrite(pwmPin, dutyCycle);
+
+  // Print potentiometer value and corresponding duty cycle
+  Serial.print("Potentiometer Value: ");
+  Serial.print(potValue);
+  Serial.print("   Duty Cycle: ");
+  Serial.println(dutyCycle);
+
+  // Blink the built-in LED
+  digitalWrite(ledPin, HIGH);
+  delay(500);
+  digitalWrite(ledPin, LOW);
+  delay(500);
+}