#include "WiFi.h"
#include "ESPAsyncWebServer.h"
#include "main.h"
// Replace with your network credentials
const char *ssid = "wifi";
const char *password = "password";
#define DHTPIN GPIO_NUM_4 // Digital pin connected to the DHT sensor
// Uncomment the type of sensor in use:
#define DHTTYPE DHT_TYPE_DHT11 // DHT 11
//#define DHTTYPE DHT_TYPE_DHT22 // DHT 22 (AM2302)
//#define DHTTYPE DHT_TYPE_DHT21 // DHT 21 (AM2301)
float DHT::readTemperature(bool f)
{
float humidity = 0;
float temperature = 0;
esp_err_t result = dht_read_float_data(type_, gpio_, &humidity,
&temperature);
if (result == ESP_OK) {
ESP_LOGI("[DHT::readTemperature]", "Humidity: %.1f%% Temperature: %.1f°C",
humidity,
temperature);
} else {
ESP_LOGE("[DHT::readTemperature]", "Failed to read sensor data: %s",
esp_err_to_name(result));
}
return f ? (temperature * 1.8f) + 32 : temperature;
}
float DHT::readHumidity()
{
float humidity = 0;
float temperature = 0;
esp_err_t result = dht_read_float_data(type_, gpio_, &humidity,
&temperature);
if (result == ESP_OK) {
ESP_LOGI("[DHT::readTemperature]", "Humidity: %.1f%% Temperature: %.1f°C",
humidity,
temperature);
} else {
ESP_LOGE("[DHT::readTemperature]", "Failed to read sensor data: %s",
esp_err_to_name(result));
}
return humidity;
}
DHT dht(DHTPIN, DHTTYPE);
// Create AsyncWebServer object on port 80
AsyncWebServer server(80);
String readDHTTemperature()
{
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
float t = dht.readTemperature();
// Check if any reads failed and exit early (to try again).
if (isnan(t)) {
Serial.println("Failed to read from DHT sensor!");
return "--";
} else {
Serial.println(t);
return String(t);
}
}
String readDHTHumidity()
{
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
float h = dht.readHumidity();
if (isnan(h)) {
Serial.println("Failed to read from DHT sensor!");
return "--";
} else {
Serial.println(h);
return String(h);
}
}
const char index_html[] PROGMEM = R"rawliteral(
<!DOCTYPE HTML><html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css" integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">
<style>
html {
font-family: Arial;
display: inline-block;
margin: 0px auto;
text-align: center;
}
h2 { font-size: 3.0rem; }
p { font-size: 3.0rem; }
.units { font-size: 1.2rem; }
.dht-labels{
font-size: 1.5rem;
vertical-align:middle;
padding-bottom: 15px;
}
</style>
</head>
<body>
<h2>ESP32 DHT Server</h2>
<p>
<i class="fas fa-thermometer-half" style="color:#059e8a;"></i>
<span class="dht-labels">Temperature</span>
<span id="temperature">%TEMPERATURE%</span>
<sup class="units">°C</sup>
</p>
<p>
<i class="fas fa-tint" style="color:#00add6;"></i>
<span class="dht-labels">Humidity</span>
<span id="humidity">%HUMIDITY%</span>
<sup class="units">%</sup>
</p>
</body>
<script>
setInterval(function ( ) {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("temperature").innerHTML = this.responseText;
}
};
xhttp.open("GET", "/temperature", true);
xhttp.send();
}, 10000 ) ;
setInterval(function ( ) {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("humidity").innerHTML = this.responseText;
}
};
xhttp.open("GET", "/humidity", true);
xhttp.send();
}, 10000 ) ;
</script>
</html>)rawliteral";
// Replaces placeholder with DHT values
String processor(const String &var)
{
//Serial.println(var);
if (var == "TEMPERATURE") {
return readDHTTemperature();
} else if (var == "HUMIDITY") {
return readDHTHumidity();
}
return String();
}
void setup()
{
// Serial port for debugging purposes
Serial.begin(115200);
// Connect to Wi-Fi
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi..");
}
// Print ESP32 Local IP Address
Serial.println(WiFi.localIP());
// Route for root / web page
server.on("/", HTTP_GET, [ ](AsyncWebServerRequest *request) {
request->send(200, "text/html", index_html, processor);
});
server.on("/temperature", HTTP_GET, [ ](AsyncWebServerRequest *request) {
request->send(200, "text/plain", readDHTTemperature().c_str());
});
server.on("/humidity", HTTP_GET, [ ](AsyncWebServerRequest *request) {
request->send(200, "text/plain", readDHTHumidity().c_str());
});
// Start server
server.begin();
}
void loop()
{
}