Generic Button

[PDE-Paul]

Hi All,

I am looking for an ESP32 code example

That simply displays a Button on screen and when I tap the Button it changes color and I must be able to toggle a GPIO on my ESP32. I have searched the internet and this repository with no luck.

I have a basic example in place that if I tap my screen I get the x, y co-ordinates returned to my Serial port. So my hardware is working.

Kind Regards
Paul

[AcuarioCat]

Check this out, maybe does what you want
#428

[dazzor]

This is a modified version from randomnerdtutorials.com - he as a lot of great tutorials and books:

#include <WiFi.h>
const char* ssid = "ARRIS-FCA9";
const char* password = "332444311605";
WiFiServer server(80);
String header;
String output4State = "off"; // red
String output16State = "off"; // green
String output17State = "off"; // blue
const int output4 = 4; // red
const int output16 = 16; // green
const int output17 = 17; // blue
unsigned long currentTime = millis();
unsigned long previousTime = 0;
const long timeoutTime = 2000;

void setup() {
Serial.begin(115200);
pinMode(output4, OUTPUT);
pinMode(output16, OUTPUT);
pinMode(output17, OUTPUT);
digitalWrite(output4, HIGH);
digitalWrite(output16, HIGH);
digitalWrite(output17, HIGH);
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();
if (client) {
currentTime = millis();
previousTime = currentTime;
Serial.println("New Client.");
String currentLine = "";
while (client.connected() && currentTime - previousTime <= timeoutTime) {
currentTime = millis();
if (client.available()) {
char c = client.read();
Serial.write(c);
header += c;
if (c == '\n') {
if (currentLine.length() == 0) {
client.println("HTTP/1.1 200 OK");
client.println("Content-type:text/html");
client.println("Connection: close");
client.println();
if (header.indexOf("GET /4/on") >= 0) {
Serial.println("GPIO 4 on");
output4State = "on";
digitalWrite(output4, HIGH);
} else if (header.indexOf("GET /4/off") >= 0) {
Serial.println("GPIO 4 off");
output4State = "off";
digitalWrite(output4, LOW);
} else if (header.indexOf("GET /16/on") >= 0) {
Serial.println("GPIO 16 on");
output16State = "on";
digitalWrite(output16, HIGH);
} else if (header.indexOf("GET /16/off") >= 0) {
Serial.println("GPIO 16 off");
output16State = "off";
digitalWrite(output16, LOW);
} else if (header.indexOf("GET /17/on") >= 0) {
Serial.println("GPIO 17 on");
output17State = "on";
digitalWrite(output17, HIGH);
} else if (header.indexOf("GET /17/off") >= 0) {
Serial.println("GPIO 17 off");
output17State = "off";
digitalWrite(output17, LOW);
}
client.println("");
client.println("<meta name="viewport" content="width=device-width, initial-scale=1">");
client.println("<link rel="icon" href="data:,">");
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>");
client.println("

ESP32 Web Server

");
client.println("

GPIO 4 - State " + output4State + "

");
if (output4State=="off") {
client.println("

<a href="/4/on"><button class="button">ON

");
} else {
client.println("

<a href="/4/off"><button class="button button2">OFF

");
}

        client.println("<p>GPIO 16 - State " + output16State + "</p>");
        if (output16State=="off") {
          client.println("<p><a href=\"/16/on\"><button class=\"button\">ON</button></a></p>");
        } else {
          client.println("<p><a href=\"/16/off\"><button class=\"button button2\">OFF</button></a></p>");
        } 
        client.println("<p>GPIO 17 - State " + output17State + "</p>");
        if (output17State=="off") {
          client.println("<p><a href=\"/17/on\"><button class=\"button\">ON</button></a></p>");
        } else {
          client.println("<p><a href=\"/17/off\"><button class=\"button button2\">OFF</button></a></p>");
        }

        client.println("</body></html>");
        
        client.println();
        break;
      } else {
        currentLine = "";
      }
    } else if (c != '\r') {
      currentLine += c;
    }
  }
}
header = "";
client.stop();
Serial.println("Client disconnected.");
Serial.println("");

}
}