5V Relay Module for Arduino

/*
 * ==================================================================
 *  Generated by Codey.online  —  https://www.codey.online
 * ==================================================================
 *  Project   : Control a 5V Relay with Arduino UNO
 *  Board     : Arduino UNO (arduino:avr:uno)
 *  Parts     : Relay Module 5V
 *  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.
 * ==================================================================
 */

// 5V Relay Module Example
const int RELAY_PIN = 7;

void setup() {
  pinMode(RELAY_PIN, OUTPUT);
  Serial.begin(115200);
  Serial.println(F("Relay module demo started."));
}

void loop() {
  // Turn relay ON
  digitalWrite(RELAY_PIN, HIGH);
  Serial.println(F("Relay: ON"));
  delay(2000);

  // Turn relay OFF
  digitalWrite(RELAY_PIN, LOW);
  Serial.println(F("Relay: OFF"));
  delay(2000);
}

/*
 * ==================================================================
 *  Generated by Codey.online  —  https://www.codey.online
 * ==================================================================
 *  Project   : 5V Relay Control with ESP32
 *  Board     : ESP32 DEVKIT V1 (esp32:esp32:esp32doit-devkit-v1)
 *  Parts     : Relay Module 5V
 *  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.
 * ==================================================================
 */

// 5V Relay Control Example for ESP32
const int RELAY_PIN = 4;

void setup() {
  Serial.begin(115200);
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, LOW);
  Serial.println("Relay control initialized.");
}

void loop() {
  // Turn relay ON (Active HIGH for standard modules)
  Serial.println("Relay: ON");
  digitalWrite(RELAY_PIN, HIGH);
  delay(2000);

  // Turn relay OFF
  Serial.println("Relay: OFF");
  digitalWrite(RELAY_PIN, LOW);
  delay(2000);
}