I'm trying to follow this tutorial:
My board is ESP32 devkit v1 and I'm using arduino IDE.
I have 2 issues: the red led doesn't work (I've tested the red led and it is working), the green led
works but the buttons don't turn it on and off, it switches on when I plug in the board.
This is the board:
This is the complete code that I wrote:
// Load Wi-Fi library
#include <WiFi.h>
// Network credentials Here
const char* ssid = "ESP32-Network";
const char* password = "Esp32-Password";
// Set web server port number to 80
WiFiServer server(80);
// Variable to store the HTTP request
String header;
//variables to store the current LED states
String statePin16 = "off";
String statePin17 = "off";
//Output variable to GPIO pins
const int ledPin16 = 16;
const int ledPin17 = 17;
// Current time
unsigned long currentTime = millis();
// Previous time
unsigned long previousTime = 0;
// Define timeout time in milliseconds
const long timeoutTime = 2000;
void setup() {
Serial.begin(115200);
pinMode(ledPin16, OUTPUT); // set the LED pin mode
digitalWrite(ledPin16, 0); // turn LED off by default
pinMode(ledPin17, OUTPUT); // set the LED pin mode
digitalWrite(ledPin17, 0); // turn LED off by default
WiFi.softAP(ssid,password);
// Print IP address and start web server
Serial.println("");
Serial.println("IP address: ");
Serial.println(WiFi.softAPIP());
server.begin();
}
void loop() {
WiFiClient client = server.available(); // Listen for incoming clients
if (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 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 /16/on") >= 0) {
statePin16 = "on";
digitalWrite(ledPin16, HIGH); // turns the LED on
} else if (header.indexOf("GET /16/off") >= 0) {
statePin16 = "off";
digitalWrite(ledPin16, LOW); //turns the LED off
}
if (header.indexOf("GET /17/on") >= 0) {
statePin17 = "on";
digitalWrite(ledPin17, HIGH); // turns the LED on
} else if (header.indexOf("GET /17/off") >= 0) {
statePin17 = "off";
digitalWrite(ledPin17, LOW); //turns the LED off
}
// 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
client.println("<style>html { font-family: monospace; display: inline-block; margin: 0px auto; text-align: center;}");
client.println(".button { background-color: yellowgreen; border: none; color: white; padding: 16px 40px;");
client.println("text-decoration: none; font-size: 32px; margin: 2px; cursor: pointer;}");
client.println(".button2 {background-color: gray;}</style></head>");
client.println("<body><h1>ESP32 Web Server</h1>");
client.println("<p>Control LED State</p>");
if (statePin16 == "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>");
}
if (statePin17 == "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>");
// 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();
Serial.println("Client disconnected.");
Serial.println("");
}
}
Any help is appreciated.
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