🌟 ESP8266 4-Relay Control with Arduino IoT Cloud 🌟

This project demonstrates how to control four relays using an ESP8266 (NodeMCU) and the Arduino IoT Cloud. Relays can be toggled locally via physical switches or remotely through a cloud-based dashboard.

Project website link https://electroiot.in/esp8266-4-relay-iot-control-with-arduino-cloud-push-buttons

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🎯 Features

• 🛠️ Local Control: Toggle relays with connected switches.
• 🌐 Remote Control: Use the Arduino IoT Cloud dashboard to manage relays online.
• 📶 WiFi Feedback: An LED indicates WiFi connectivity status.
• 🔄 Synchronized State: Updates from manual and remote operations are always in sync.

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🛒 Hardware Requirements

1. ESP8266 (NodeMCU)
2. 4-Channel Relay Module
3. Push Buttons or Toggle Switches
4. Power Supply
5. Connecting Wires

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🖼️ Circuit Diagram

🧩 Connections

• Relays:
  • Relay 1: GPIO 5 (D1)
  • Relay 2: GPIO 4 (D2)
  • Relay 3: GPIO 15 (D8)
  • Relay 4: GPIO 13 (D7)
• Switches:
  • Switch 1: GPIO 0 (D3)
  • Switch 2: GPIO 2 (D4)
  • Switch 3: GPIO 14 (D5)
  • Switch 4: GPIO 12 (D6)

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⚙️ Setup Instructions

🛠️ 1. Install Required Libraries

Install the following libraries from the Arduino IDE Library Manager:

• ArduinoIoTCloud
• Arduino_ConnectionHandler

🖥️ 2. Configure Arduino IoT Cloud

1. Create a new "Thing" in the Arduino IoT Cloud.
2. Add the following variables:
   • relay1 (type: CloudSwitch)
   • relay2 (type: CloudSwitch)
   • relay3 (type: CloudSwitch)
   • relay4 (type: CloudSwitch)
3. Link each variable to a toggle switch on the dashboard.

🚀 3. Flash the ESP8266

1. Connect the ESP8266 to your computer.
2. Upload the provided code after replacing WiFi credentials and Arduino IoT Cloud keys.

🔌 4. Wire the Components

Follow the circuit diagram to connect relays, switches, and the ESP8266.

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📜 Code Explanation

1. Pin Definitions

#define RelayPin1 5  // D1
#define RelayPin2 4  // D2
#define RelayPin3 15 // D8
#define RelayPin4 13 // D7

#define SwitchPin1 0  // D3
#define SwitchPin2 2  // D4
#define SwitchPin3 14 // D5
#define SwitchPin4 12 // D6

## 📜 **2. Cloud Integration**

CloudSwitch relay1;
CloudSwitch relay2;
CloudSwitch relay3;
CloudSwitch relay4;

## 📜 **3. Manual Control Logic**

void manual_control() {
  if (digitalRead(SwitchPin1) == LOW) {
    toggleState_1 = !toggleState_1;
    digitalWrite(RelayPin1, !toggleState_1);
    relay1 = toggleState_1;
  }
  // Repeat for other switches...
}

## 📜 **4. Remote Control Logic**

void onRelay1Change() {
  digitalWrite(RelayPin1, relay1 ? LOW : HIGH);
}

## 🎥 **Demo**
![alt_text, width="100"](/image/demo.JPG)

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## 💡 **Future Improvements**
1. Add feedback mechanisms for relay states (e.g., LEDs).
2. Expand to control additional devices.
3. Integrate scheduling for automation.

## 💡 📧 ** Contact Us **

📧 Contact Us
For any questions or feedback, feel free to reach out at: [email protected] and [email protected]# ESP8266-NodeMCU-4CH-Relay-Module