Control led light remotely using Nodemcu esp8266

In this project, we are going to turn a led on or off and talk about the protocol involved. First let's set up our project.

COMPONENTS REQUIRED:

NodeMCU esp8266, 9 V battery, IC7805 Voltage Regulator, 330 ohm resistor, led, connecting wires.

PROJECT SETUP:

Step 1: Setup the arduino IDE to upload the code to NodeMCU esp8266 (I've given another post on how to setup your ide to upload your code in detail)

Step 2: Copy this code and paste it in your IDE and upload it to your NodeMCU esp8266

#include <ESP8266WiFi.h>

#include <ESP8266WebServer.h> // Replace with your network credentials

const char* ssid = "xxxxx";

const char* password = "xxxxxx";

ESP8266WebServer server(80);

const int ledPin = D0; // Define the pin connected to the LED

void handleRoot() {

String status;

if (server.hasArg("on")) {

digitalWrite(ledPin, HIGH);

status = "LED is ON";

} else if (server.hasArg("off")) {

digitalWrite(ledPin, LOW);

status = "LED is OFF";

}

String html = "<html><body>";

html += "<h1>ESP8266 LED Control</h1>";

html += "<p>Current LED Status: " + status + "</p>";

html += "<p><a href='?on'>Turn On</a></p>";

html += "<p><a href='?off'>Turn Off</a></p>";

html += "</body></html>";

server.send(200, "text/html", html);

}

void setup() {

Serial.begin(115200);

pinMode(ledPin, OUTPUT);

digitalWrite(ledPin, LOW); // Initialize LED as off

// Connect to Wi-Fi

WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {

delay(1000);

Serial.println("Connecting to WiFi...");

}

Serial.println("Connected to WiFi");

Serial.print("IP address: ");

Serial.println(WiFi.localIP());

// Define web server routes

server.on("/", handleRoot);

// Start the server

server.begin();

Serial.println("HTTP server started");

}

void loop() {

server.handleClient();

}

The code will be uploaded just fine in this setting:

Note: Choose your COM port after verifying it in the drive manager.

Note: Just connect the nodemcu directly without led

After uploading the screen will look like this:

Step 3: Open your serial monitor and then press the reset button in your nodeMCU. After pressing reset you can see this in your serial monitor:

Press Reset:

Step 4: Copy the IP Address and paste it in the google or any web browser. You'll get this webpage.

Step 5: Remove NodeMCU esp8266 from the USB-B cable and give connections as per this diagram:

Note: The output voltage from NodeMCU esp8266 will be 5V which will damage the led overtime. So, to protect the led we are using a 330 ohm resistor. Since the voltage required to turn on a led differs according to its color you might want to change the resistor value if needed. Similarly, IC7805 is used to supply a constant voltage of 5 V to NodeMCU esp8266.

Our project setup is now ready!

TEST:

Now when you click 'Turn On' on the browser, your led should turn on and viceversa.

ENHANCEMENT:

If you want to control the led using your mobile phone, try MIT Inventor app at https://appinventor.mit.edu/

Step 1: Click on the button- Create Apps!

Step 2: After you login using your credentials and agree to the terms and conditions, you will get this screen:

Step 3: Click on continue and close any screen that pops up, click on New Project and give a project name and then you will get a screen like this: