Récupérer la valeur d’un input « number » d’une page web sur l’esp32
Prérequis :
- 1 x Carte ESP32
- Fils de connexion
Version IDE :
- Arduino IDE 2.3.5
Bibliothèque :
- LittleFS.h (Tuto dispo)
- ESPAsyncWebServer.h (version: 3.7.10 par ESP32Async)
- AsyncTCP.h (version 3.4.7 par ESP32Async)
Vidéo de démonstration :
Schéma de câblage :
Code :
Code Arduino :
#include "LittleFS.h"
#include <AsyncTCP.h>
#include <ESPAsyncWebServer.h>
#include <WiFi.h>
const char *ssid = "......"; // "Votre Nom_du_routeur"
const char *password = "......"; // "Votre Mot_de_passe_du_routeur"
AsyncWebServer server(80);
float Valeurfloat = 2.2;
void setup() {
Serial.begin(115200);
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected.");
Serial.println("IP address: ");
// Imprimer l'adresse IP locale ESP
Serial.println(WiFi.localIP());
if (!LittleFS.begin()) {
Serial.println("An Error has occurred while mounting LittleFS");
return;
}
server.on("/", HTTP_GET, [](AsyncWebServerRequest *request) {
request->send(LittleFS, "/index.html", "text/html");
});
server.on("/script.js", HTTP_GET, [](AsyncWebServerRequest *request) {
request->send(LittleFS, "/script.js", "text/javascript");
});
////////Read/Write Valeurfloat
server.on("/read_Valeurfloat", HTTP_GET, [](AsyncWebServerRequest *request) {
String message = String(Valeurfloat);
request->send(200, "text/plain", message);
});
server.on("/write_Valeurfloat", HTTP_POST, [](AsyncWebServerRequest *request) {
if (request->hasParam("Valeurfloat", true)) {
String message;
message = request->getParam("Valeurfloat", true)->value();
Valeurfloat = message.toFloat();
}
request->send(204);
});
server.on("/read_Valeurfloatinfo", HTTP_GET, [](AsyncWebServerRequest *request) {
String message = String(Valeurfloat);
request->send(200, "text/plain", message);
});
// Démarrer le serveur
server.begin();
}
void loop() {
Serial.print("Valeur float :");
Serial.println(Valeurfloat);
Serial.println("------------------");
delay(1000);
}
Code HTML :
( index.html )
<!DOCTYPE html>
<html lang="fr">
<head>
<title></title>
<meta name="viewport" content="width=device-width, initial-scale=1" charset="UTF-8" />
<script type="text/javascript" src="https://webapps1.chicago.gov/cdn/jQuery-3.4.1/jquery-3.4.1.min.js"></script>
<script type="text/javascript" src="script.js"></script>
</head>
<body>
<div>
<h4>Valeur de la variable "Valeurfloat" sur ESP32 :</h4>
<table border="1"><tr><td width="100px"><center><h2><span id="Valeurfloatinfo"></span></h2></center></td></tr></table>
<br>
</div>
<div class="">
<h3 class="">Saisir une valeur Float :</h3>
<input type="number" id="Valeurfloat" step="0.10" />
<button id="AppValeurfloat" class="">Appliquer</button>
</div>
</body>
</html>
Code Javascript :
( script.js )
////////Read/Write Valeurfloat
function getDataValeurfloat() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function () {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("Valeurfloat").value = this.responseText;
}
};
xhttp.open("GET", "read_Valeurfloat", true);
xhttp.send();
};
getDataValeurfloat();
function getDataValeurfloatinfo() {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function () {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("Valeurfloatinfo").innerHTML = this.responseText;
}
};
xhttp.open("GET", "read_Valeurfloatinfo", true);
xhttp.send();
};
getDataValeurfloatinfo();
$(document).ready(function(){
$("#AppValeurfloat").click(function(){
var valeur = $("#Valeurfloat").val();
$.post("write_Valeurfloat",{
Valeurfloat: valeur
});
document.getElementById("Valeurfloatinfo").textContent = "----";
getDataValeurfloatinfo();
});
});
function functioninterval() {
getDataValeurfloatinfo();
}
setInterval( functioninterval, 500 );
