IOT with ESP32
Connection to a network Connection to a secured network
Create a network with ESP32 (ACCESS POINT)
IOT with ESP32
Running web server
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Rui Santos
Complete project details at https://randomnerdtutorials.com
*********/// Load Wi-Fi library#include <WiFi.h>// Replace with your network credentialsconst
char* ssid = "REPLACE_WITH_YOUR_SSID";const char* password =
"REPLACE_WITH_YOUR_PASSWORD";// Set web server port number to 80
WiFiServer server(80);// Variable to store the HTTP request
String header;// Auxiliar variables to store the current output state
String output26State = "off";
String output27State = "off";// Assign output variables to GPIO pinsconst int output26 =
26;const int output27 = 27;// Current timeunsigned long currentTime = millis();// Previous
timeunsigned long previousTime = 0;// Define timeout time in milliseconds (example: 2000ms =
2s)const long timeoutTime = 2000;void setup() {
Serial.begin(115200);// Initialize the output variables as outputspinMode(output26,
OUTPUT);pinMode(output27, OUTPUT);// Set outputs to LOWdigitalWrite(output26,
LOW);digitalWrite(output27, LOW);// Connect to Wi-Fi network with SSID and password
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);while (WiFi.status() != WL_CONNECTED) {delay(500);
Serial.print(".");}// Print local IP address and start web server
Serial.println("");
Serial.println("WiFi connected.");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
server.begin();}void loop(){
WiFiClient client = server.available(); // Listen for incoming clientsif (client) { //
If a new client connects,
currentTime = millis();
previousTime = currentTime;
Serial.println("New Client."); // print a message out in the serial port
String currentLine = ""; // make a String to hold incoming data from the clientwhile
(client.connected() && currentTime - previousTime <= timeoutTime) { // loop while the client's
connected
currentTime = millis();if (client.available()) { // if there's bytes to read from the
client,char c = client.read(); // read a byte, then
Serial.write(c); // print it out the serial monitor
header += c;if (c == '\n') { // if the byte is a newline character// if the current line
is blank, you got two newline characters in a row.// that's the end of the client HTTP request, so
send a response:if (currentLine.length() == 0) {// HTTP headers always start with a response
code (e.g. HTTP/1.1 200 OK)// and a content-type so the client knows what's coming, then a
blank line:
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println("Connection: close");
client.println();// turns the GPIOs on and offif (header.indexOf("GET /26/on") >= 0) {
Serial.println("GPIO 26 on");
output26State = "on";digitalWrite(output26, HIGH);} else if (header.indexOf("GET /26/off") >= 0)
{
Serial.println("GPIO 26 off");
output26State = "off";digitalWrite(output26, LOW);} else if (header.indexOf("GET /27/on") >= 0)
{
Serial.println("GPIO 27 on");
output27State = "on";digitalWrite(output27, HIGH);} else if (header.indexOf("GET /27/off") >= 0)
{
Serial.println("GPIO 27 off");
output27State = "off";digitalWrite(output27, LOW);}
// Display the HTML web page
client.println("<!DOCTYPE html><html>");
client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-
scale=1\">");
client.println("<link rel=\"icon\" href=\"data:,\">");
// CSS to style the on/off buttons
// Feel free to change the background-color and font-size attributes to fit your
preferences
client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-
align: center;}");
client.println(".button { background-color: #4CAF50; border: none; color: white; padding: 16px
40px;");
client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
client.println(".button2 {background-color: #555555;}</style></head>");
// Web Page Heading
client.println("<body><h1>ESP32 Web Server</h1>");// Display current state, and ON/OFF
buttons for GPIO 26
client.println("<p>GPIO 26 - State " + output26State + "</p>");// If the output26State is off, it
displays the ON button if (output26State=="off") {
client.println("<p><a href=\"/26/on\"><button class=\"button\">ON</button></a></p>");} else {
client.println("<p><a href=\"/26/off\"><button class=\"button button2\">OFF</button></a>
</p>");}// Display current state, and ON/OFF buttons for GPIO 27
client.println("<p>GPIO 27 - State " + output27State + "</p>");// If the output27State is off, it
displays the ON button if (output27State=="off") {
client.println("<p><a href=\"/27/on\"><button class=\"button\">ON</button></a></p>");} else {
client.println("<p><a href=\"/27/off\"><button class=\"button button2\">OFF</button></a>
</p>");}
client.println("</body></html>");// The HTTP response ends with another blank line
client.println();// Break out of the while loopbreak;} else { // if you got a newline, then clear
currentLine
currentLine = "";}} else if (c != '\r') { // if you got anything else but a carriage return character,
currentLine += c; // add it to the end of the currentLine}}}// Clear the header variable
header = "";// Close the connection
client.stop();
Serial.println("Client disconnected.");
Serial.println("");}}
