How to control AC bulb or load using ESP32 over WiFi with Relay
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
- 00:45 Introduction
- 03:46 Wiring Explained
- 06:33 Preparing Arduin IDE for ESP32
- 08:45 Code Explained
- 17:08 Demonstration (desktop)
- 18:59 Demonstraiton (mobile phone)
- 19:57 Demonstration using external 5V
Resources for this sketch
- How to use a breadboard (video)
- Get Early Access to my videos via Patreon
- ESP32 Github repository
- ESP32 Datasheet (pdf)
- Robojax Arduino Course on Udemy
- Get Early Access to my videos via Patreon
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