LM2596S Adjustable Step-Down 4-40V -> 1.25-37V with onboard Voltmeter Display

/*
 * ==================================================================
 *  Generated by Codey.online  —  https://www.codey.online
 * ==================================================================
 *  Project   : LM2596 Step-Down Voltage Monitor
 *  Board     : Arduino UNO (arduino:avr:uno)
 *  Parts     : Adjustable Step-down Module 3-40VDC 1.5-35VDC LM2596
 *  Libraries : none (built-in)
 *
 *  Codey Online is an AI-powered browser IDE for Arduino and ESP32.
 *  Describe your project and Codey writes the code, draws the wiring
 *  diagram and uploads it to your board, straight from the browser.
 *  This code is free to use, modify and share, without warranty.
 * ==================================================================
 */

const int voltagePin = A0;

void setup() {
  Serial.begin(115200);
  while (!Serial) {
    ; // Wait for serial port to connect
  }
  Serial.println(F("LM2596 Step-Down Module Monitor"));
  Serial.println(F("Turn the onboard brass potentiometer to adjust output voltage."));
  Serial.println(F("-----------------------------------------------------------"));
}

void loop() {
  // Read the analog voltage (0 to 1023 corresponds to 0V to 5V)
  int rawValue = analogRead(voltagePin);
  float voltage = (rawValue * 5.0) / 1023.0;

  Serial.print(F("Raw ADC: "));
  Serial.print(rawValue);
  Serial.print(F(" | Output Voltage: "));
  Serial.print(voltage, 2);
  Serial.println(F(" V"));

  delay(500);
}

/*
 * ==================================================================
 *  Generated by Codey.online  —  https://www.codey.online
 * ==================================================================
 *  Project   : Powering ESP32 with LM2596 Buck Converter
 *  Board     : ESP32 DEVKIT V1 (esp32:esp32:esp32doit-devkit-v1)
 *  Parts     : Adjustable Step-down Module 3-40VDC 1.5-35VDC LM2596
 *  Libraries : none (built-in)
 *
 *  Codey Online is an AI-powered browser IDE for Arduino and ESP32.
 *  Describe your project and Codey writes the code, draws the wiring
 *  diagram and uploads it to your board, straight from the browser.
 *  This code is free to use, modify and share, without warranty.
 * ==================================================================
 */

const int LED_PIN = 2;
unsigned long counter = 0;

void setup() {
  Serial.begin(115200);
  pinMode(LED_PIN, OUTPUT);
  
  Serial.println("LM2596 Step-Down Powered ESP32 Started!");
  Serial.println("Ensure LM2596 output was calibrated to 5.0V before connecting to VIN.");
}

void loop() {
  digitalWrite(LED_PIN, HIGH);
  delay(500);
  digitalWrite(LED_PIN, LOW);
  delay(500);

  counter++;
  Serial.print("ESP32 running stably on buck regulator. Heartbeat count: ");
  Serial.println(counter);
}