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Control an LED from Webserver using NodeMcu or Esp8266 programming with Arduino IDE.


In this blog, we will see How to "Turn On and Turn Off" an LED that has connected to the Esp8266, the esp8266 has programmed from Arduino IDE to control the LED.

We will connect the Esp8266 to the Wi-Fi router using SSID and password of our Home network Wifi , where the esp8266 connect to our wifi and create a webserver, which can be accessed by looking through the serial Monitor of the Arduino window or you can also log into your Wifi router and check for the list of clients connected to your Wi-Fi router.

Here's a window which explains the step by step procedure to connect the Esp8266 to the Wi-fi server and How to access the Webpage and control the LED connected to the Esp8266


For the above video I have used NodeMcu, you can use any type of Esp8266 to make this thing work in your web browser. 



look for the mapping of pins in with your Esp8266 vendor, if the program not working properly for you , the fault will be with the pin mapping functionalities, Here I used the D7 pin which mapped to 13th pin when program from the Arduino IDE.


Connect your Esp8266 to Arduino IDE and Select the correct COM Port and board type and 
upload the program. 

Note change the SSID to your WiFi Name and password to your Wifi password. if you forget to change it , esp8266 will not connect connect your wifi.

--------------------------------------------------------------------------------------------------------------------------


#include <ESP8266WiFi.h>
 
const char* ssid = "Magesh";
const char* password = "jayakumar";
 
int ledPin = 13; // GPIO13
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 pin is now: ");
 
  if(value == HIGH) {
    client.print("On");
  } else {
    client.print("Off");
  }
  client.println("<br><br>");
  client.println("<a href=\"/LED=ON\"\"><button>Turn On </button></a>");
  client.println("<a href=\"/LED=OFF\"\"><button>Turn Off </button></a><br />");  
  client.println("</html>");
 
  delay(1);
  Serial.println("Client disonnected");
  Serial.println("");
 
}
 
-------------------------------------------------------------------------------------------









If everything completed you can turn to your serial monitor and check for the ip address that your devices has connected to . you will presented with an serial monitor that look exactly to the picture below.


if you like the above tutorial and if you want try out with cool projects you can also check this link here , that's the amazon book link where you can use that book to make IoT with Esp8266 or Nodemcu, that books gives you basic coverage on how to do simple things and get yourself started with arduino and goes on developing projects like sending data to webserver and creating a webserver, uploading and controlling data from a webpage, how to interface TFT LCD and I2C devices and many more things can find on the link.

174 comments:

  1. http://www.amazon.in/ESP8266-Serial-Wireless-Transceiver-Module/dp/B00O34AGSU/ref=sr_1_1?ie=UTF8&qid=1452944269&sr=8-1&keywords=esp+8266

    Can I control the LED using my module - A blog would be appreciated.

    ReplyDelete
  2. Hi,
    thank you for this tutorial. I bought your kindle book and did the 'blink; example.
    Then I tried 'Control an LED from Webserver using NodeMcu' but after loading the the code and opening the serial monitor it only writes points (....................................) not the URL number. Can you help me?

    ReplyDelete
    Replies
    1. Hi have you configured your SSID and password for your browser correctly? if you get only (.........) as your output it means that your ESP8266 is not connected to your browser. mail me at jayakumarmagesh@gmail.com

      Delete
    2. Good day my friend,

      my name is Carlos Zapien, I was looking your totorial of Control an LED from Webserver using NodeMcu or Esp8266 programming with Arduino IDE, everything is ok but, i have problems with the conections and a can't conect the arduino uno and the ESP8266 to turn it on the led, can you help me please?, it just the conection between both devices, your code is running now, thank you so much my friend!!!



      Saludos!!!

      Delete
  3. This works great! Thanks for taking the time to write this tutorial.

    ReplyDelete
  4. Hello,
    Thanks for this tutorial.
    I am new to NodeMCU ESP8266 12E.
    I have done a few blinking and accesspoint examples and all works fine with Arduino IDE 1.6.7 and my Win 7 PC.

    I tried your tutorial code and on my Arduino IDE serial port, I am getting an 'Exception (3)' error:
    Connecting to Magesh
    Exception (3):
    epc1=0x401003e9 epc2=0x00000000 epc3=0x00000000 excvaddr=0x4002a839 depc=0x00000000
    ctx: cont
    sp: 3ffef8b0 end: 3ffefc90 offset: 01a0
    >>>stack>>>
    3ffefa50

    When I modified, changed the ssid and password, I am getting the same error that 'Nadav Ziv' was getting;
    always telling me 'connecting to ' and never stops!

    Your help is much appreciated...

    ReplyDelete
  5. You should never use an LED without resistor or you will destroy it.

    ReplyDelete
  6. Thanks for sharing the code and great work.

    Can you please help combine this with the ESP8266WebServer.h - HttpBasicAuth in the example? I really like to add a login at the beginning of accessing server.

    ReplyDelete
    Replies
    1. Did you get the abv Roy
      I am looking for the exact same thing

      Delete
  7. Very nice article!
    got successfully control my led.

    ReplyDelete
  8. Thanks dude doing a great job...thanks a lot

    ReplyDelete
  9. Thanks dude doing a great job...thanks a lot

    ReplyDelete
  10. can u send book name please i am not able to see the book in amezon .. plz mail me the name of book on amazon rangrezumarfarukh@gmail.com

    ReplyDelete
  11. my is showing --Error compiling board node MCU 0.9(ESP-12 Mode)

    Board nodemcu(platform esp 8266,package esp 8266) is unknown
    error compiling for board nodeMCU 0.9(ESP-12 Module).

    plies help me

    ReplyDelete
    Replies
    1. I have the same problema.
      What can I do?
      Thank you

      Delete
    2. The same problema with V0.9 and V1.0

      Delete
  12. #include

    const char* ssid = "Kontrol_Bol";
    const char* password = "11qq22ww";

    ReplyDelete
  13. ok works. :) how can i add more 3 leds.
    and on smartphone is menu buttons too small whic line can i menu larger.

    ReplyDelete
  14. otima espricacao.

    esta dando erro neste serto oque pode ser pque estou aprendendo ainda
    obrigado
    / Inicie o servidor
    servidor. Começar ();

    ReplyDelete
  15. Thanks a lot for this tutorial :D

    ReplyDelete
  16. Hey first thanks for the great tutorial works great and its still simple!!!!
    But I have this problem that the server is only accesible in the first 20-40 minutes after that i have to reset the esp/wemos because the server is down!

    Can please anyone tell me how to fix this?

    Thanks

    ReplyDelete
  17. Worked on the way,........Thank you for all code....I have modified it as per my requirements

    ReplyDelete
  18. The LEDs can be controlled from anywhere with the help of the given URL or it has to be connected to the same wifi on which the esp is connected?I mean if we have the URL then can I control the led anywhere around the globe?

    ReplyDelete
    Replies
    1. no it(device) had to be connected with the same connection(wifi) as the the ESP's.

      Delete
  19. Brilliant thank you just what I have been looking for.
    Could you tell me how to monitor a switch connected to the ESP8266 from a webpage?

    ReplyDelete
  20. I have tried to copy and paste the code from the webpage , when I put it into an Arduino sketch I get an error

    ReplyDelete
  21. Wow gracias amigo me ayudaste un monton recien empece con el esp

    ReplyDelete
  22. hi nice project...thanks for sharing.
    how to control more than 1 gpio.
    and is there any direct link to turn leds off and on?
    :)

    ReplyDelete
  23. i want to connect given ip address by wifi.localip() to another webpage which is not connected to nodemcu wifi network



    9

    ReplyDelete
  24. Good day my friend,

    my name is Carlos Zapien, I was looking your totorial of Control an LED from Webserver using NodeMcu or Esp8266 programming with Arduino IDE, everything is ok but, i have problems with the conections and a can't conect the arduino uno and the ESP8266 to turn it on the led, can you help me please?, it just the conection between both devices, your code is running now, thank you so much my friend!!!

    Regards!!!

    ReplyDelete
    Replies
    1. Hi Carlos,

      There is no Arduino Uno involved. It all runs on the NodeMCU itself, including connecting the LED.

      Delete
  25. why it stops responding after sometime???

    ReplyDelete
    Replies
    1. You have to replace:
      while(!client.available()){
      delay(1);
      }
      with:
      int t = millis();
      while(!client.available()){
      delay(1);
      if (millis()-t>130) return;
      }
      because sometime the module locked into the while loop so we have to return if it locked for more than 130 milliseconds! I read it from: https://openhomeautomation.net/control-a-lamp-remotely-using-the-esp8266-wifi-chip/

      Delete
  26. This is super and worked first time for me, it worked even when I entered the IP address on my iPhone! Now... next step... if I wanted to use (style) and a .class to change the appearance of the button, is there any way to do that?

    ReplyDelete
  27. after copying the url onto a browser it is showing this site can not be reached please help what is the problem

    ReplyDelete
    Replies
    1. Maggie, try the SSID#, example 192.168.1.1 (I think the default the AP mode uses, is 192.168.4.1).. But, since this is using the local router, it will be a different number.

      Delete
    2. I stand corrected, the IP#, not the SSID.. (forgive me, Networking newbie)

      Delete
  28. The Article give Where Everyone And Everything Will Be Monitored On The Internet is awesome.It Give brief information about How the Internet of Things Gone work.Thanks for Sharing the information about it.

    seo expert in nepal

    ReplyDelete
  29. hi.
    always still waiting ...........
    and it never give me any adresse to open it :(
    can anyone help me please ?

    ReplyDelete
  30. Welcome Post very usefull informatation.and iam expecting more posts like this please keep updating us........

    ReplyDelete
  31. same project, you can see another instruction here
    http://engineer2you.blogspot.com/2017/06/esp8266-esp12e-web-server-with-arduino.html

    ReplyDelete
  32. Can any one please give me code fo multiple channel output @shubhamrajput00722@gmail.com

    ReplyDelete
  33. Very simple but useful project. I test it in my NodeMCU 1.0 (ESP-12E) module and worked perfectly . Programmed using Arduino IDE 1.8.3.

    ReplyDelete
  34. Thanks for a great starter project. It worked first time... until I scanned my home network with the "Fing" app on my phone. It locked up.

    You need to add
    count = 0;
    while(!client.available()){
    delay(1);
    count++;
    if ( count > 1000 )
    {
    Serial.println("Abandoned Client");
    return;
    }
    }
    to stop network scans from locking it up.

    ReplyDelete
  35. It's so cool. I tried and liked the implementation.

    ReplyDelete
  36. Is it possible to connect to multiple client and control the LED?

    ReplyDelete
  37. does it works on ny other wifi mobile network if they turn on the led????

    ReplyDelete
  38. Help! I get this error:
    aggregate 'ip_addr_t addr' has incomplete type and cannot be defined

    ip_addr_t addr;
    I do not know what the problem is please help!

    ReplyDelete
  39. Hi, I uploaded your code on my NodeMCU V2 Amica.
    I don´t get an error message, but the serial Monitor prints out only questionmarks.
    I only changed the ledPin to LED_BUILTIN because I don´t have a LED right now.
    I also noticed, that I don´t have the "Upload using Serial" button at my tools menue.
    Please help.

    ReplyDelete
    Replies
    1. ok, I changed the Baud adjustment. Now it is all dots. I know it means it can´t connect to the router. But I´m sure I used the right name and Passwort.

      Delete
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    ReplyDelete
  41. how to do when looking at web server with 1 button turn off and turn 4 led?

    ReplyDelete
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  43. Thank you for efforts...
    in order to open web server i used ip xxx.xxx.xxx.xxx:80/
    And it worked for me

    ReplyDelete
  44. can input from NODE be obtained ?

    ReplyDelete
  45. how to make webpage like ,(enter Ontime enter off time) relay?

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  46. Superb Post, Full of Technical Knowledge. Reading this post enhance my knowledge about IOT. You can also checkout article on Introduction to Internet of Things

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  48. i just copy and paste this code on arduino ide the serial monitor gives the ip address ijust copy and paste on url.It cannot connect web server it shows this site cannot be reached.please help me.

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  52. Hi, I have followed the above process.
    WiFi connection has been established, but the LED does not switch ON and OFF according to the instructions.
    The blue LED on the nodeMCU performs the exact opposite operation of the command that I execute from the URL, whereas the LED that I've connected to the NODEMCU does not work at all.
    Please help.
    Thankyou.

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  57. hello, how can i use the same button for tuning "on" and "off" the same led ?

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  62. I am Jamnas
    i had connected one led to esp8266nodemcu for ON/OFF the LED remotely.
    urfortunately the following error occured
    when the serial monitor shows IP address ,i just copied and paste it into the browser
    at that time browser shows" cant reach the site .
    please help me how to correct it and also i want to read my led status from remote browser

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  64. It's working only the same network....How can I access the Relay module over the Internet by using web browser ?

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  85. "C:\\Users\\KIIT\\AppData\\Local\\Arduino15\\packages\\esp8266\\tools\\xtensa-lx106-elf-gcc\\2.5.0-3-20ed2b9/bin/xtensa-lx106-elf-size" -A "C:\\Users\\KIIT\\AppData\\Local\\Temp\\arduino_build_881074/sketch_nov06b.ino.elf"
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    Connecting........_____....._____....._____....._____....._____....._____.....____Traceback (most recent call last):
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    File "C:/Users/KIIT/AppData/Local/Arduino15/packages/esp8266/hardware/esp8266/2.5.2/tools/esptool\esptool.py", line 468, in connect
    raise FatalError('Failed to connect to %s: %s' % (self.CHIP_NAME, last_error))
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  117. Hola, a mi aun no me ha funcionado, me sale el siguiente error, podrias por favor ayudarme:

    Arduino:1.8.13 (Windows 10), Tarjeta:"NodeMCU 1.0 (ESP-12E Module), 80 MHz, Flash, Legacy (new can return nullptr), All SSL ciphers (most compatible), 4MB (FS:2MB OTA:~1019KB), 2, v2 Lower Memory, Disabled, None, Only Sketch, 115200"

    ATENCIÓN: la librería IoTtweetESP32 pretende ejecutarse sobre arquitectura(s) esp32 y puede ser incompatible con tu actual tarjeta la cual corre sobre arquitectura(s) esp8266.

    D:\Arduino\ESP8266_New\ESP8266_New.ino: In function 'void setup()':

    ESP8266_New:29:28: error: invalid conversion from 'const char*' to 'char*' [-fpermissive]

    WiFi.begin(ssid, password);

    ^

    In file included from D:\Arduino\ESP8266_New\ESP8266_New.ino:1:0:

    C:\Program Files (x86)\Arduino\libraries\WiFi\src/WiFi.h:79:9: error: initializing argument 1 of 'int WiFiClass::begin(char*, const char*)' [-fpermissive]

    int begin(char* ssid, const char *passphrase);

    ^

    Se encontraron varias bibliotecas para "WiFi.h"

    Usado: C:\Program Files (x86)\Arduino\libraries\WiFi

    No usado: D:\Arduino\libraries\WiFiNINA

    Se encontraron varias bibliotecas para "ArduinoJson.h"

    Usado: D:\Arduino\libraries\Antares_ESP8266_HTTP

    No usado: D:\Arduino\libraries\Antares_ESP8266_MQTT

    Se encontraron varias bibliotecas para "ESP8266WiFi.h"

    Usado: D:\Arduino\libraries\ESP8266WiFi

    No usado: C:\Users\user\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4\libraries\ESP8266WiFi

    Se encontraron varias bibliotecas para "SPI.h"

    Usado: D:\Arduino\libraries\SPI

    No usado: C:\Users\user\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4\libraries\SPI

    Se encontraron varias bibliotecas para "ESP8266HTTPClient.h"

    Usado: D:\Arduino\libraries\ESP8266HTTPClient

    No usado: C:\Users\user\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\2.7.4\libraries\ESP8266HTTPClient

    exit status 1

    invalid conversion from 'const char*' to 'char*' [-fpermissive]

    La carpeta o el archivo zip no contienen una librería válida



    Este informe podría contener más información con
    "Mostrar salida detallada durante la compilación"
    opción habilitada en Archivo -> Preferencias.


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