Internet Controlled LED Using NodeMCU

If everything is correct when you press ON the LED will light up and when you press OFF the LED will turn off.

Jun 7, 2021

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led

esp8266

internetcontroll

Devices & Components

5 mm LED: Red

Breadboard (generic)

ESP8266 ESP-12E

Jumper wires (generic)

Switch Actuator, Head for spring return push-button

Project description

Code

c_cpp

Here is the project code

1#include <ESP8266WiFi.h>
2 
3const char* ssid = "SDL AP1";
4const  char* password = "Systechd33";
5 
6int ledPin = 13; // GPIO13---D7 of NodeMCU
7WiFiServer  server(80);
8 
9void setup() {
10  Serial.begin(115200);
11  delay(10);
12  
13  pinMode(ledPin, OUTPUT);
14  digitalWrite(ledPin, LOW);
15 
16  // Connect  to WiFi network
17  Serial.println();
18  Serial.println();
19  Serial.print("Connecting  to ");
20  Serial.println(ssid);
21 
22  WiFi.begin(ssid, password);
23 
24  while (WiFi.status() != WL_CONNECTED) {
25    delay(500);
26    Serial.print(".");
27  }
28  Serial.println("");
29  Serial.println("WiFi connected");
30 
31  // Start the server
32  server.begin();
33  Serial.println("Server started");
34  
35  // Print the IP address
36  Serial.print("Use this URL to connect: ");
37  Serial.print("http://");
38  Serial.print(WiFi.localIP());
39  Serial.println("/");
40  
41}
42 
43void loop() {
44  // Check if a client has connected
45  WiFiClient  client = server.available();
46  if (!client) {
47    return;
48  }
49 
50  // Wait until the client sends some data
51  Serial.println("new client");
52  while(!client.available()){
53    delay(1);
54  }
55 
56  // Read the first  line of the request
57  String request = client.readStringUntil('\r');
58  Serial.println(request);
59  client.flush();
60 
61  // Match the request
62 
63  int value = LOW;
64  if (request.indexOf("/LED=ON") != -1)  {
65    digitalWrite(ledPin, HIGH);
66    value = HIGH;
67  }
68  if (request.indexOf("/LED=OFF") != -1)  {
69    digitalWrite(ledPin,  LOW);
70    value = LOW;
71  }
72 
73// Set ledPin according to the request
74//digitalWrite(ledPin,  value);
75 
76  // Return the response
77  client.println("HTTP/1.1 200 OK");
78  client.println("Content-Type: text/html");
79  client.println(""); //  do  not forget this one
80  client.println("<!DOCTYPE HTML>");
81  client.println("<html>");
82  
83  client.print("Led is now: ");
84 
85  if(value == HIGH) {
86    client.print("On");
87  } else {
88    client.print("Off");
89  }
90  client.println("<br><br>");
91  client.println("<a href=\\"/LED=ON\\"\\"><button>On </button></a>");
92  client.println("<a href=\\"/LED=OFF\\"\\"><button>Off </button></a><br />");  
93  client.println("</html>");
94 
95  delay(1);
96  Serial.println("Client  disonnected");
97  Serial.println("");
98 
99}
100

#include <ESP8266WiFi.h>
 
const char* ssid = "SDL AP1";
const  char* password = "Systechd33";
 
int ledPin = 13; // GPIO13---D7 of NodeMCU
WiFiServer  server(80);
 
void setup() {
  Serial.begin(115200);
  delay(10);
  
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);
 
  // Connect  to WiFi network
  Serial.println();
  Serial.println();
  Serial.print("Connecting  to ");
  Serial.println(ssid);
 
  WiFi.begin(ssid, password);
 
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
 
  // Start the server
  server.begin();
  Serial.println("Server started");
  
  // Print the IP address
  Serial.print("Use this URL to connect: ");
  Serial.print("http://");
  Serial.print(WiFi.localIP());
  Serial.println("/");
  
}
 
void loop() {
  // Check if a client has connected
  WiFiClient  client = server.available();
  if (!client) {
    return;
  }
 
  // Wait until the client sends some data
  Serial.println("new client");
  while(!client.available()){
    delay(1);
  }
 
  // Read the first  line of the request
  String request = client.readStringUntil('\r');
  Serial.println(request);
  client.flush();
 
  // Match the request
 
  int value = LOW;
  if (request.indexOf("/LED=ON") != -1)  {
    digitalWrite(ledPin, HIGH);
    value = HIGH;
  }
  if (request.indexOf("/LED=OFF") != -1)  {
    digitalWrite(ledPin,  LOW);
    value = LOW;
  }
 
// Set ledPin according to the request
//digitalWrite(ledPin,  value);
 
  // Return the response
  client.println("HTTP/1.1 200 OK");
  client.println("Content-Type: text/html");
  client.println(""); //  do  not forget this one
  client.println("<!DOCTYPE HTML>");
  client.println("<html>");
  
  client.print("Led is now: ");
 
  if(value == HIGH) {
    client.print("On");
  } else {
    client.print("Off");
  }
  client.println("<br><br>");
  client.println("<a href=\\"/LED=ON\\"\\"><button>On </button></a>");
  client.println("<a href=\\"/LED=OFF\\"\\"><button>Off </button></a><br />");  
  client.println("</html>");
 
  delay(1);
  Serial.println("Client  disonnected");
  Serial.println("");
 
}

Downloadable files

Pin Diagram

Here is the pin diagram.

Pin Diagram

Here is the pin diagram.

Pin Diagram

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