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How to control AC bulb or load using ESP32 over WiFi with Relay

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Download Arduino Sketch File

How to control AC bulb or load using ESP32 over WiFi with Relay

This video shows how turn ON and OFF an AC load such as fun or bulb or a DC load over WiFi by utilizing ESP32 Microcontroller.
a 5V Relay module is used which controls the load. 3.3V relay module will work as well.

Topics and Timing of section of video

The link to use in the "preferences" of Arduino IDE for ESP32 board https://dl.espressif.com/dl/package_esp32_index.json Watch video for instructions.

Resources for this sketch

Fading 2 or more LEDs using ESP32


 /*
 * Webserver code taken form File->Examples->(under ESP32) WebServer->AdvancedWebServer
 * this sketch is paret of Arduino IDE (get it from Arduino.cc) and heavily modefied
 *  
 * Contol a relay over WiFi using ESP32 Microcontroller to 
 * turn ON or OFF AC bulb or fan or other load
 * 
 * Watch Video instrution for this code: https://youtu.be/QjbxWnBdcbQ
 * 
 * Full explanation of this code and wiring diagram is available at
 * my Arduino Course at Udemy.com here: http://robojax.com/L/?id=62

 * Written by Ahmad Shamshiri on Feb 21, 2020 at 19:45
 * in Ajax, Ontario, Canada. www.robojax.com
 * 

 * Get this code and other Arduino codes from Robojax.com
Learn Arduino step by step in structured course with all material, wiring diagram and library
all in once place. Purchase My course on Udemy.com http://robojax.com/L/?id=62

If you found this tutorial helpful, please support me so I can continue creating 
content like this. You can support me on Patreon http://robojax.com/L/?id=63

or make donation using PayPal http://robojax.com/L/?id=64

 *  * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.* 
 * This code has been download from Robojax.com
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.

   Copyright (c) 2015, Majenko Technologies
   All rights reserved.

   Redistribution and use in source and binary forms, with or without modification,
   are permitted provided that the following conditions are met:

 * * Redistributions of source code must retain the above copyright notice, this
     list of conditions and the following disclaimer.

 * * Redistributions in binary form must reproduce the above copyright notice, this
     list of conditions and the following disclaimer in the documentation and/or
     other materials provided with the distribution.

 * * Neither the name of Majenko Technologies nor the names of its
     contributors may be used to endorse or promote products derived from
     this software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
   ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
   ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
   ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/


int relayPin = 12;//define a pin for relay
String buttonTitle1 ="Light ON";
String buttonTitle2 ="Light OFF";

int relayStat = 1;//initial state . 1 ON, 0 OFF

#include <WiFi.h>
#include <WiFiClient.h>
#include <WebServer.h>
#include <ESPmDNS.h>

const char *ssid = "YOUR_WIFI_SSID";
const char *password = "YOUR_WIFI_PASSWORD";

WebServer server(80);
const int led = 13;

void handleRoot() {
  //Robojax.com ESP32 Relay Control 
  digitalWrite(led, 1);  
 String HTML ="<!DOCTYPE html>\
  <html>\
  <head>\
  	
<title>Robojax ESP32 Relay Control</title>\
  	
<meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">\
  
<style>\
 
html,body{	
width:100%\;
height:100%\;
margin:0}
*{box-sizing:border-box}
.colorAll{
	background-color:#90ee90}
.colorBtn{
	background-color:#add8e6}
.angleButtdon,a{
	font-size:30px\;
border:1px solid #ccc\;
display:table-caption\;
padding:7px 10px\;
text-decoration:none\;
cursor:pointer\;
padding:5px 6px 7px 10px}a{
	display:block}
.btn{
	margin:5px\;
border:none\;
display:inline-block\;
vertical-align:middle\;
text-align:center\;
white-space:nowrap}
";
   
  HTML +="</style>

</head>

<body>
<h1>Robojax ESP32 Relay Control </h1>
";
  
  if(relayStat){
    HTML +="	<div class=\"btn\">
		<a class=\"angleButton\" style=\"background-color:#90ee90\"  href=\"/relay?do=off\">";
    HTML +=buttonTitle1; //Light ON title
  }else{
    HTML +="	<div class=\"btn\">
		<a class=\"angleButton \" style=\"background-color:#f56464\"  href=\"/relay?do=on\">";
    HTML +=buttonTitle2;//Light OFF title  
  }
  HTML +="</a>	
	</div>
</body>
</html>
";
  server.send(200, "text/html", HTML);  
  digitalWrite(led, 0);  
  //Robojax.com ESP32 Relay Control 
}//handleRoot()

void handleNotFound() {
  //Robojax.com ESP32 Relay Control 
  digitalWrite(led, 1);
  String message = "File Not Found

";
  message += "URI: ";
  message += server.uri();
  message += "
Method: ";
  message += (server.method() == HTTP_GET) ? "GET" : "POST";
  message += "
Arguments: ";
  message += server.args();
  message += "
";

  for (uint8_t i = 0; i < server.args(); i++) {
    message += " " + server.argName(i) + ": " + server.arg(i) + "
";
  }

  server.send(404, "text/plain", message);
  digitalWrite(led, 0);
  //Robojax.com ESP32 Relay Control 
}

void setup(void) {
  //Robojax.com ESP32 Relay Control 
  pinMode(led, OUTPUT);
  digitalWrite(led, 0);  
  pinMode(relayPin, OUTPUT);// define a pin as output for relay
  digitalWrite(relayPin, relayStat);//initial state either ON or OFF
  Serial.begin(115200);//initialize the serial monitor
  Serial.println("Robojax ESP32 Relay");

  //Robojax.com ESP32 Relay Control 

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  Serial.println("");
 // Wait for connection
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());

  //multicast DNS //Robojax.com ESP32 Relay Control 
  if (MDNS.begin("robojaxEsp32")) {
    Serial.println("MDNS responder started");
  }
  server.on("/", handleRoot);
  server.on("/relay", HTTP_GET, relayControl);  //  relayControl() is at the end of this code     
  server.onNotFound(handleNotFound);
  server.begin();
  Serial.println("HTTP server started");

}

void loop(void) {
  //Robojax ESP32 Relay Control . 
  server.handleClient();

  if(relayStat)
  {
    digitalWrite(relayPin, LOW);
  }else{
    digitalWrite(relayPin, HIGH);    
  }

  //Robojax ESP32 Relay Control 
  delay(100);
}

/*
 * relayControl()
 * updates the value of "relayStat" varible to 1 or zero 
 * returns nothing
 * written by Ahmad Shamshiri
 * on Wednesday Feb 19, 2020 at 20:34 in Ajax, Ontario, Canada
 * www.robojax.com
 */
void relayControl() {
  if(server.arg("do") == "on")
  {
    relayStat =1;
    

  }else{
    relayStat =0;   

  }

  handleRoot();
}//relayControl() end
   
Download Arduino Sketch File