[esp] Port temp-humidity-web example to cmake.
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4
esp/cpp/05_temp-humidity-web/main/CMakeLists.txt
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esp/cpp/05_temp-humidity-web/main/CMakeLists.txt
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idf_component_register(
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SRCS "main.cpp"
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INCLUDE_DIRS "."
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)
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esp/cpp/05_temp-humidity-web/main/idf_component.yml
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esp/cpp/05_temp-humidity-web/main/idf_component.yml
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## IDF Component Manager Manifest File
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dependencies:
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## Required IDF version
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idf:
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version: '>=4.1.0'
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# # Put list of dependencies here
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# # For components maintained by Espressif:
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# component: "~1.0.0"
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# # For 3rd party components:
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# username/component: ">=1.0.0,<2.0.0"
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# username2/component2:
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# version: "~1.0.0"
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# # For transient dependencies `public` flag can be set.
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# # `public` flag doesn't have an effect dependencies of the `main` component.
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# # All dependencies of `main` are public by default.
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# public: true
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espressif/arduino-esp32: ^3.1.1
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zorxx/dht: ^1.0.1
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esp32async/espasyncwebserver: ^3.7.0~1
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esp/cpp/05_temp-humidity-web/main/main.cpp
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esp/cpp/05_temp-humidity-web/main/main.cpp
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#include "WiFi.h"
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#include "ESPAsyncWebServer.h"
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#include "main.h"
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// Replace with your network credentials
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const char *ssid = "wifi";
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const char *password = "password";
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#define DHTPIN GPIO_NUM_4 // Digital pin connected to the DHT sensor
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// Uncomment the type of sensor in use:
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#define DHTTYPE DHT_TYPE_DHT11 // DHT 11
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//#define DHTTYPE DHT_TYPE_DHT22 // DHT 22 (AM2302)
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//#define DHTTYPE DHT_TYPE_DHT21 // DHT 21 (AM2301)
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float DHT::readTemperature(bool f)
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{
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float humidity = 0;
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float temperature = 0;
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esp_err_t result = dht_read_float_data(type_, gpio_, &humidity,
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&temperature);
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if (result == ESP_OK) {
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ESP_LOGI("[DHT::readTemperature]", "Humidity: %.1f%% Temperature: %.1f°C",
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humidity,
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temperature);
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} else {
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ESP_LOGE("[DHT::readTemperature]", "Failed to read sensor data: %s",
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esp_err_to_name(result));
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}
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return f ? (temperature * 1.8f) + 32 : temperature;
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}
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float DHT::readHumidity()
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{
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float humidity = 0;
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float temperature = 0;
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esp_err_t result = dht_read_float_data(type_, gpio_, &humidity,
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&temperature);
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if (result == ESP_OK) {
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ESP_LOGI("[DHT::readTemperature]", "Humidity: %.1f%% Temperature: %.1f°C",
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humidity,
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temperature);
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} else {
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ESP_LOGE("[DHT::readTemperature]", "Failed to read sensor data: %s",
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esp_err_to_name(result));
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}
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return humidity;
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}
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DHT dht(DHTPIN, DHTTYPE);
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// Create AsyncWebServer object on port 80
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AsyncWebServer server(80);
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String readDHTTemperature()
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{
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// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
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float t = dht.readTemperature();
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// Check if any reads failed and exit early (to try again).
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if (isnan(t)) {
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Serial.println("Failed to read from DHT sensor!");
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return "--";
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} else {
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Serial.println(t);
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return String(t);
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}
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}
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String readDHTHumidity()
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{
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// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
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float h = dht.readHumidity();
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if (isnan(h)) {
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Serial.println("Failed to read from DHT sensor!");
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return "--";
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} else {
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Serial.println(h);
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return String(h);
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}
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}
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const char index_html[] PROGMEM = R"rawliteral(
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<!DOCTYPE HTML><html>
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<head>
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css" integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">
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<style>
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html {
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font-family: Arial;
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display: inline-block;
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margin: 0px auto;
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text-align: center;
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}
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h2 { font-size: 3.0rem; }
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p { font-size: 3.0rem; }
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.units { font-size: 1.2rem; }
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.dht-labels{
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font-size: 1.5rem;
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vertical-align:middle;
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padding-bottom: 15px;
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}
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</style>
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</head>
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<body>
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<h2>ESP32 DHT Server</h2>
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<p>
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<i class="fas fa-thermometer-half" style="color:#059e8a;"></i>
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<span class="dht-labels">Temperature</span>
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<span id="temperature">%TEMPERATURE%</span>
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<sup class="units">°C</sup>
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</p>
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<p>
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<i class="fas fa-tint" style="color:#00add6;"></i>
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<span class="dht-labels">Humidity</span>
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<span id="humidity">%HUMIDITY%</span>
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<sup class="units">%</sup>
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</p>
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</body>
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<script>
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setInterval(function ( ) {
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var xhttp = new XMLHttpRequest();
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xhttp.onreadystatechange = function() {
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if (this.readyState == 4 && this.status == 200) {
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document.getElementById("temperature").innerHTML = this.responseText;
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}
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};
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xhttp.open("GET", "/temperature", true);
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xhttp.send();
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}, 10000 ) ;
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setInterval(function ( ) {
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var xhttp = new XMLHttpRequest();
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xhttp.onreadystatechange = function() {
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if (this.readyState == 4 && this.status == 200) {
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document.getElementById("humidity").innerHTML = this.responseText;
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}
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};
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xhttp.open("GET", "/humidity", true);
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xhttp.send();
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}, 10000 ) ;
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</script>
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</html>)rawliteral";
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// Replaces placeholder with DHT values
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String processor(const String &var)
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{
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//Serial.println(var);
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if (var == "TEMPERATURE") {
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return readDHTTemperature();
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} else if (var == "HUMIDITY") {
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return readDHTHumidity();
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}
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return String();
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}
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void setup()
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{
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// Serial port for debugging purposes
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Serial.begin(115200);
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// Connect to Wi-Fi
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WiFi.begin(ssid, password);
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while (WiFi.status() != WL_CONNECTED) {
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delay(1000);
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Serial.println("Connecting to WiFi..");
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}
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// Print ESP32 Local IP Address
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Serial.println(WiFi.localIP());
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// Route for root / web page
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server.on("/", HTTP_GET, [ ](AsyncWebServerRequest *request) {
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request->send(200, "text/html", index_html, processor);
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});
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server.on("/temperature", HTTP_GET, [ ](AsyncWebServerRequest *request) {
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request->send(200, "text/plain", readDHTTemperature().c_str());
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});
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server.on("/humidity", HTTP_GET, [ ](AsyncWebServerRequest *request) {
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request->send(200, "text/plain", readDHTHumidity().c_str());
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});
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// Start server
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server.begin();
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}
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void loop()
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{
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}
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33
esp/cpp/05_temp-humidity-web/main/main.h
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33
esp/cpp/05_temp-humidity-web/main/main.h
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@@ -0,0 +1,33 @@
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#ifndef MAIN_H
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#define MAIN_H
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#include <cstdint>
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#include "dht.h"
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class DHT {
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public:
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DHT(gpio_num_t gpio, dht_sensor_type_t type) :
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gpio_(gpio), type_(type) { }
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~DHT() = default;
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/**
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* Read temperature from DHT sensor
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*
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* @param f True to return in Fahrenheit, False for Celsius.
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*/
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float readTemperature(bool f = true);
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/**
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* Read humidity from DHT sensor.
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*/
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float readHumidity();
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private:
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gpio_num_t gpio_;
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dht_sensor_type_t type_;
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};
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#endif // MAIN_H
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