Control 4 Relays with ESP8266 and Arduino IoT Cloud

Arduino IDE

NodeMCU ESP8266

Soldering kit

1 relay module 5 Vdc 10A (assembled)

Arduino Cloud 

<html><body>This project allows you to control four relays using an ESP8266 (NodeMCU) via the Arduino IoT Cloud. You can toggle relays using physical switches or control them remotely from anywhere using a cloud-based dashboard. 🎯 Key Features: ✅ Manual Control – Use physical switches to toggle relays. ✅ Remote Control – Control the relays from the Arduino IoT Cloud Dashboard. ✅ WiFi Connectivity – Get real-time feedback on the relay status. ✅ Synchronization – Changes from manual and cloud control stay updated. Components RequiredComponent	QuantityESP8266 (NodeMCU)	14-Channel Relay Module	1Push Buttons or Toggle Switches	4Power Supply (5V/3.3V)	1Connecting Wires	As neededCircuit Diagram🖼️ Follow the wiring diagram below to connect your components:Wiring Details: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)Step-by-Step Instructions1️⃣ Install Required LibrariesOpen the Arduino IDE and install the following libraries via the Library Manager:ArduinoIoTCloudArduino_ConnectionHandler2️⃣ Configure Arduino IoT CloudGo to Arduino IoT Cloud and create a new Thing.Add the following Cloud Variables:relay1 (type: CloudSwitch)relay2 (type: CloudSwitch)relay3 (type: CloudSwitch)relay4 (type: CloudSwitch)Link these variables to a toggle switch in the dashboard.3️⃣ Upload the Code to ESP8266Connect the ESP8266 to your computer.Upload the following Arduino Sketch (after replacing WiFi credentials and Cloud Keys):#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 // D6CloudSwitch relay1;CloudSwitch relay2;CloudSwitch relay3;CloudSwitch relay4;void setup() { pinMode(RelayPin1, OUTPUT); pinMode(RelayPin2, OUTPUT); pinMode(RelayPin3, OUTPUT); pinMode(RelayPin4, OUTPUT); pinMode(SwitchPin1, INPUT_PULLUP); pinMode(SwitchPin2, INPUT_PULLUP); pinMode(SwitchPin3, INPUT_PULLUP); pinMode(SwitchPin4, INPUT_PULLUP);}void loop() { if (digitalRead(SwitchPin1) == LOW) { relay1 = !relay1; digitalWrite(RelayPin1, relay1 ? LOW : HIGH); }}4️⃣ Test Your ProjectPress the physical switches to control the relays.Use the Arduino IoT Cloud Dashboard to toggle the relays remotely.Demonstration📺 Watch the project in action!Future Improvements🔹 Add real-time feedback (LEDs for relay status).🔹 Expand control for more devices.🔹 Add timer scheduling for automation.Contact &amp; Support📩 For any questions or suggestions, feel free to email: electroiot@hotmail.com</body></html>

Control 4 Relays with ESP8266 and Arduino IoT Cloud

In this project, we use an ESP8266 microcontroller to control four relays connected to electrical devices. The relays can be toggled via switches or remotely using the Arduino IoT Cloud dashboard. This solution is perfect for automating devices and monitoring them online.