ESP32 wifi buzzer code
//#include <LiquidCrystal_I2C.h>
// Load Wi-Fi library
#include <WiFi.h>
// LiquidCrystal_I2C lcd(0x27,16,2);
// Your own network credentials
const char* ssid = "@home";
const char* password = "password";
IPAddress local_IP(192, 168, 1, 55);
IPAddress gateway(192, 168, 1, 1);
IPAddress subnet(255, 255, 255, 0);
IPAddress primaryDNS(8, 8, 8, 8); //optional
IPAddress secondaryDNS(8, 8, 4, 4);
// 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 switch1_state = "off";
String switch2_state = "off";
// Assign output variables to GPIO pins
#define pin26 26
#define pin27 27
unsigned long currentTime = millis();
unsigned long previousTime = 0;
const long timeoutTime = 2000;
void setup() {
Serial.begin(9600);
pinMode(pin26, OUTPUT);
pinMode(pin27, OUTPUT);
digitalWrite(pin26, LOW);
digitalWrite(pin27, LOW);
// Configures static IP address
if (!WiFi.config(local_IP, gateway, subnet, primaryDNS, secondaryDNS)) {
Serial.println("STA Failed to configure");
}
// use esp32 as Wifi access point with its own ssid or as Wifi client of an existing Wifi network
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
}
server.begin();
}
void loop(){
WiFiClient client = server.available(); // Listen for incoming clients
if (client) { // If a new client connects,
currentTime = millis();
previousTime = currentTime;
String currentLine = ""; // make a String to hold incoming data from the client
while (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 off
if (header.indexOf("GET /switch1_on") >= 0) {
// Serial.println("GPIO 26 on");
switch1_state = "on";
digitalWrite(pin26, HIGH);
} else if (header.indexOf("GET /switch1_off") >= 0) {
// Serial.println("GPIO 26 off");
switch1_state = "off";
digitalWrite(pin26, LOW);
} else if (header.indexOf("GET /switch2_on") >= 0) {
// Serial.println("GPIO 27 on");
switch2_state = "on";
digitalWrite(pin27, HIGH);
} else if (header.indexOf("GET /switch2_off") >= 0) {
switch2_state = "off";
digitalWrite(pin27, 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>Blinking light " + switch1_state + "</p>");
// If the output26State is off, it displays the ON button
if (switch1_state=="off") {
client.println("<p><a href=\"/switch1_on\"><button class=\"button\">ON</button></a></p>");
} else {
client.println("<p><a href=\"/switch1_off\"><button class=\"button button2\">OFF</button></a></p>");
}
// Display current state, and ON/OFF buttons for GPIO 27
client.println("<p>Buzzer " + switch2_state + "</p>");
// If the output27State is off, it displays the ON button
if (switch2_state=="off") {
client.println("<p><a href=\"/switch2_on\"><button class=\"button\">ON</button></a></p>");
} else {
client.println("<p><a href=\"/switch2_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 loop
break;
} 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();
}
}