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You are here:Home » ESP32 Arduino : Create a Webpage to Control a Relay Module

By Abhishek Ghosh March 6, 2019 5:03 pm Updated on March 6, 2019

ESP32 Arduino : Create a Webpage to Control a Relay Module

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Here is How to Create a Webpage to Control a Relay Module Using ESP32 Arduino. For this project, one needs to setup ESP32 with Arduino in the manner we described earlier. It is a Wi-Fi based project (not IoT). This is a basic example which provides the base of advanced projects. Previously we published few basic projects with relay. Use separate DC voltage supply for the relay (avoid AC for testing without guidance according to your age and experience). Using relay with Arduino is easy, it is just like using LED directly :

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int relay_pin = 4;
void setup() {
  pinMode(relay_pin, OUTPUT);
}
void loop() {
  digitalWrite(relay_pin, HIGH);
  delay(4000);
  digitalWrite(relay_pin, LOW);
  delay(4000);
}

ESP32 Arduino Create a Webpage to Control a Relay Module

Now, for the Wi-Fi part, we need to modify the code in this way :

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#include <WiFi.h>
 
const char* wifi_name = "your_ssid"; // Your Wifi network name here
const char* wifi_pass = "your_pass";    // Your Wifi network password here
 
WiFiServer server(80);    // Server will be at port 80
 
int relay_pin = 4;
 
void setup()
{
  Serial.begin (115200);
  pinMode (relay_pin, OUTPUT);
  Serial.print ("Connecting to ");
  WiFi.begin (wifi_name, wifi_pass);     // Connecting to the wifi network
  while (WiFi.status() != WL_CONNECTED) // Waiting for the response of wifi network
{
    delay (500);
    Serial.print (".");
}
  Serial.println("");
  Serial.println("Connection Successful");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());           // Getting the IP address
  Serial.println("Type the above IP address into browser search bar");
  server.begin();                           // Starting the server
}
...

Now, we need to create a webpage with this kind of HTML code :

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---

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<html>
<title>ESP32</title>
<body>
<h1>ESP32 Standalone Relay Control </h1>
<p>Relay Control</p>
<a href="/?relayon"><button>ON</button></a>
<a href="/?relayoff"><button>OFF</button></a>
</body>
</html>

We can write the above code for Arduino in this way :

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          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
 
          client.println();    
          client.print("<HTML><title>ESP32</title>");
          client.print("<body><h1>ESP32 Standalone Relay Control </h1>");
          client.print("<p>Relay Control</p>");
          client.print("<a href=\"/?relayon\"\"><button>ON</button></a>");
          client.print("<a href=\"/?relayoff\"\"><button>OFF</button></a>");
          client.print("</body></HTML>");
          break;        // break out of the while loop:

The complete code will go like this :

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#include <WiFi.h>
 
const char* wifi_name = "your_ssid"; // Your Wifi network name here
const char* wifi_pass = "your_pass";    // Your Wifi network password here
 
WiFiServer server(80);    // Server will be at port 80
 
int relay_pin = 4;
 
void setup()
{
  Serial.begin (115200);
  pinMode (relay_pin, OUTPUT);
  Serial.print ("Connecting to ");
  WiFi.begin (wifi_name, wifi_pass);     // Connecting to the wifi network
  while (WiFi.status() != WL_CONNECTED) // Waiting for the response of wifi network
{
    delay (500);
    Serial.print (".");
}
  Serial.println("");
  Serial.println("Connection Successful");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());           // Getting the IP address
  Serial.println("Type the above IP address into browser search bar");
  server.begin();                           // Starting the server
}
 
 
void loop()
{
  WiFiClient client = server.available();     //Checking if any client request is available or not
  if (client)
{
    boolean currentLineIsBlank = true;
    String buffer = "";  
    while (client.connected())
{
      if (client.available())                    // if there is some client data available
{
        char c = client.read();
        buffer+=c;                              // read a byte
        if (c == '\n' && currentLineIsBlank)    // check for newline character,
{
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
 
          client.println();    
          client.print("<HTML><title>ESP32</title>");
          client.print("<body><h1>ESP32 Standalone Relay Control </h1>");
          client.print("<p>Relay Control</p>");
          client.print("<a href=\"/?relayon\"\"><button>ON</button></a>");
          client.print("<a href=\"/?relayoff\"\"><button>OFF</button></a>");
          client.print("</body></HTML>");
          break;        // break out of the while loop:
}
        if (c == '\n') {
          currentLineIsBlank = true;
          buffer="";      
}
else
          if (c == '\r') {    
          if(buffer.indexOf("GET /?relayon")>=0)
            digitalWrite(relay_pin, LOW);
          if(buffer.indexOf("GET /?relayoff")>=0)
            digitalWrite(relay_pin, HIGH);  
}
else {
          currentLineIsBlank = false;
}
}
}
    client.stop();
}
}

Notice the logic how we are receiving the command.

Tagged With create a website esp32 , Antennenanalyser mit Arduino ESP32 , control relays using the esp32 , esp32 relay control openhab , control arduino with esp32 , client println(<html><title> , control esp32 with arduino software , client print esp32 , using ESP32 with relay , arduino control via webpage
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Abhishek Ghosh

About Abhishek Ghosh

Abhishek Ghosh is a Businessman, Surgeon, Author and Blogger. You can keep touch with him on Twitter - @AbhishekCTRL.

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