#include <WiFi.h>
#include <WiFiClient.h>
#include <WebServer.h>
#include <uri/UriBraces.h>
#define WIFI_SSID "Wokwi-GUEST"
#define WIFI_PASSWORD ""
// Defining the WiFi channel speeds up the connection:
#define WIFI_CHANNEL 6
WebServer server(80);
#include "DHTesp.h"
const int DHT_PIN = 15;
DHTesp dhtSensor;
void sendHtml() {
float temperature = dhtSensor.getTemperature();
float humidity = dhtSensor.getHumidity();
String response = R"(
<!DOCTYPE html><html>
<head>
<title>ESP32 Web Server Demo</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
html { font-family: sans-serif; text-align: center; }
body { display: inline-flex; flex-direction: column; }
h1 { margin-bottom: 1.2em; }
h2 { margin: 0; }
div { display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: auto auto; grid-auto-flow: column; grid-gap: 1em; }
.btn { background-color: #5B5; border: none; color: #fff; padding: 0.5em 1em;
font-size: 2em; text-decoration: none }
.btn.OFF { background-color: #333; }
</style>
</head>
<body>
<h1>ESP32 Web Server</h1>
<div>
<h2>Temperature</h2>
<p>Temperature: <span id="temperature">TEMP_TEXT</span>°C</p>
<h2>Humidity</h2>
<p>Humidity: <span id="humidity">HUMIDITY_TEXT</span>%</p>
</div>
</body>
<script>
var temperatureSpan = document.getElementById('temperature');
var humiditySpan = document.getElementById('humidity');
function updateTemperatureAndHumidity(temperature, humidity) {
temperatureSpan.textContent = temperature;
humiditySpan.textContent = humidity;
}
</script>
</html>
)";
response.replace("TEMP_TEXT", String(temperature));
response.replace("HUMIDITY_TEXT", String(humidity));
server.send(200, "text/html", response);
}
void setup(void) {
Serial.begin(115200);
dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
WiFi.begin(WIFI_SSID, WIFI_PASSWORD, WIFI_CHANNEL);
Serial.print("Connecting to WiFi ");
Serial.print(WIFI_SSID);
// Wait for connection
while (WiFi.status() != WL_CONNECTED) {
delay(100);
Serial.print(".");
}
Serial.println(" Connected!");
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
server.on("/", sendHtml);
server.on(UriBraces("/toggle/{}"), []() {
sendHtml();
});
server.begin();
Serial.println("HTTP server started");
}
void loop(void) {
server.handleClient();
TempAndHumidity data = dhtSensor.getTempAndHumidity();
Serial.println("Temp: " + String(data.temperature, 2) + "°C");
Serial.println("Humidity: " + String(data.humidity, 1) + "%");
Serial.println("---");
delay(1000);
server.send(200, "text/html", "");
server.sendContent("<script>updateTemperatureAndHumidity('" + String(data.temperature, 2) + "°C', '" + String(data.humidity, 1) + "%');</script>");
delay(2);
}