ARDUINO_UNO.md

Arduino Uno - Smart Remote for Controlling Electrical Appliances

📖 Overview

The Arduino Uno is the central microcontroller for our Smart Remote for Controlling Electrical Appliances project. It communicates with the ESP8266 WiFi Module to receive commands and controls the LCD Display and Relay Module to operate appliances.

🔧 Features

• Acts as the main controller for the project.
• Communicates with ESP8266 via SoftwareSerial.
• Controls 2-Channel Relay Module to switch appliances ON/OFF.
• Displays messages received from the web interface on 16x2 LCD.

📜 Pin Connections

Arduino Uno	Connected To
TX (Pin 1)	ESP8266 RX (through voltage divider)
RX (Pin 0)	ESP8266 TX
Pin 7	Relay Module IN1
A4 (SDA)	LCD I2C SDA
A5 (SCL)	LCD I2C SCL
5V	LCD Display & Relay Module
3.3V	ESP8266
GND	Common Ground

🔌 How It Works

1. Receives commands from ESP8266 (e.g., turn ON/OFF appliances).
2. Sends signals to the relay module to switch appliances.
3. Displays text received via the web interface on the LCD.

🚀 Code Example (Arduino Uno)

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#define RELAY_PIN 7

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
    Serial.begin(115200);
    lcd.init();
    lcd.backlight();
    pinMode(RELAY_PIN, OUTPUT);
    digitalWrite(RELAY_PIN, LOW);
}

void loop() {
    if (Serial.available()) {
        String command = Serial.readStringUntil('\n');
        if (command == "LIGHT_ON") {
            digitalWrite(RELAY_PIN, HIGH);
        } else if (command == "LIGHT_OFF") {
            digitalWrite(RELAY_PIN, LOW);
        } else {
            lcd.clear();
            lcd.setCursor(0, 0);
            lcd.print("Message:");
            lcd.setCursor(0, 1);
            lcd.print(command);
        }
    }
}

📜 License

This project is open-source and available under the MIT License.

🙌 Credits

• Developed by Thiruselvan - ThiruXD
• Based on the work of Arduino Community
• GitHub Repository: Arduno Based Project
• Part of the Final Year Project at P.S.V Polytechnic College

🚀 Happy Arduino Uno Development! 🎉