{"id":159,"date":"2026-05-02T00:36:57","date_gmt":"2026-05-01T22:36:57","guid":{"rendered":"https:\/\/eryann.fr\/?p=159"},"modified":"2026-05-02T14:11:48","modified_gmt":"2026-05-02T12:11:48","slug":"fiche-esp32-capteur-temperature-humidite-potentiometre-et-wi-fi","status":"publish","type":"post","link":"https:\/\/eryann.fr\/index.php\/arduino\/fiche-esp32-capteur-temperature-humidite-potentiometre-et-wi-fi\/","title":{"rendered":"Fiche esp32 : capteur temp\u00e9rature\/humidit\u00e9, potentiom\u00e8tre et Wi-Fi"},"content":{"rendered":"\n<p>Pour les \u00e9tudiants en BTS CIEL ou SIO, l\u2019ESP32 permet de cr\u00e9er rapidement des objets connect\u00e9s.<br>Cette fiche pr\u00e9sente un script simple avec :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>connexion Wi-Fi<\/li>\n\n\n\n<li>lecture temp\u00e9rature et humidit\u00e9 avec un capteur DHT22<\/li>\n\n\n\n<li>lecture analogique d\u2019un potentiom\u00e8tre<\/li>\n\n\n\n<li>affichage des valeurs dans le moniteur s\u00e9rie<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">Script ESP32 complet<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ =========================================================<br>\/\/ LIBRAIRIES<br>\/\/ =========================================================<br><br>#include &lt;WiFi.h&gt;<br>#include \"DHT.h\"<br><br>\/\/ =========================================================<br>\/\/ PARAMETRES WIFI<br>\/\/ =========================================================<br><br>const char* ssid = \"NOM_DU_WIFI\";<br>const char* password = \"MOT_DE_PASSE_WIFI\";<br><br>\/\/ =========================================================<br>\/\/ PARAMETRES CAPTEURS<br>\/\/ =========================================================<br><br>#define DHTPIN 4<br>#define DHTTYPE DHT22<br><br>#define POT_PIN 34<br><br>DHT dht(DHTPIN, DHTTYPE);<br><br>\/\/ =========================================================<br>\/\/ INITIALISATION<br>\/\/ =========================================================<br><br>void setup() {<br>  Serial.begin(115200);<br><br>  dht.begin();<br><br>  Serial.println(\"Demarrage ESP32\");<br><br>  WiFi.begin(ssid, password);<br><br>  Serial.print(\"Connexion au Wi-Fi\");<br><br>  while (WiFi.status() != WL_CONNECTED) {<br>    delay(500);<br>    Serial.print(\".\");<br>  }<br><br>  Serial.println();<br>  Serial.println(\"Wi-Fi connecte\");<br>  Serial.print(\"Adresse IP : \");<br>  Serial.println(WiFi.localIP());<br>}<br><br>\/\/ =========================================================<br>\/\/ BOUCLE PRINCIPALE<br>\/\/ =========================================================<br><br>void loop() {<br>  float temperature = dht.readTemperature();<br>  float humidite = dht.readHumidity();<br><br>  int valeurPot = analogRead(POT_PIN);<br><br>  if (isnan(temperature) || isnan(humidite)) {<br>    Serial.println(\"Erreur de lecture du capteur DHT22\");<br>    delay(2000);<br>    return;<br>  }<br><br>  Serial.println(\"=================================\");<br>  Serial.print(\"Temperature : \");<br>  Serial.print(temperature);<br>  Serial.println(\" \u00b0C\");<br><br>  Serial.print(\"Humidite : \");<br>  Serial.print(humidite);<br>  Serial.println(\" %\");<br><br>  Serial.print(\"Potentiometre : \");<br>  Serial.print(valeurPot);<br>  Serial.println(\" \/ 4095\");<br><br>  delay(2000);<br>}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Explication d\u00e9taill\u00e9e<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">Mat\u00e9riel utilis\u00e9<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ESP32<\/li>\n\n\n\n<li>capteur DHT22<\/li>\n\n\n\n<li>potentiom\u00e8tre<\/li>\n\n\n\n<li>r\u00e9sistance 10 k\u03a9 si n\u00e9cessaire pour le DHT22<\/li>\n\n\n\n<li>breadboard et fils Dupont<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">C\u00e2blage propos\u00e9<\/h4>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u00c9l\u00e9ment<\/th><th>ESP32<\/th><\/tr><\/thead><tbody><tr><td>DHT22 VCC<\/td><td>3.3 V<\/td><\/tr><tr><td>DHT22 GND<\/td><td>GND<\/td><\/tr><tr><td>DHT22 DATA<\/td><td>GPIO 4<\/td><\/tr><tr><td>Potentiom\u00e8tre extr\u00e9mit\u00e9 1<\/td><td>3.3 V<\/td><\/tr><tr><td>Potentiom\u00e8tre extr\u00e9mit\u00e9 2<\/td><td>GND<\/td><\/tr><tr><td>Potentiom\u00e8tre curseur<\/td><td>GPIO 34<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>Le GPIO 34 est adapt\u00e9 \u00e0 une lecture analogique sur ESP32.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">Wi-Fi<\/h4>\n\n\n\n<p>La fonction suivante lance la connexion :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>WiFi.begin(ssid, password);<\/code><\/pre>\n\n\n\n<p>Tant que la connexion n\u2019est pas \u00e9tablie, l\u2019ESP32 attend dans la boucle :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>while (WiFi.status() != WL_CONNECTED)<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">Lecture du DHT22<\/h4>\n\n\n\n<p>Le capteur fournit :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>temp\u00e9rature en degr\u00e9s Celsius<\/li>\n\n\n\n<li>humidit\u00e9 en pourcentage<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>float temperature = dht.readTemperature();<br>float humidite = dht.readHumidity();<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h4 class=\"wp-block-heading\">Lecture du potentiom\u00e8tre<\/h4>\n\n\n\n<p>L\u2019ESP32 lit une valeur analogique entre 0 et 4095 :<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>int valeurPot = analogRead(POT_PIN);<\/code><\/pre>\n\n\n\n<p>Cette valeur d\u00e9pend de la position du potentiom\u00e8tre.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Tests<\/h3>\n\n\n\n<p>Dans le moniteur s\u00e9rie Arduino IDE :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>vitesse : 115200 bauds<\/li>\n\n\n\n<li>v\u00e9rifier l\u2019adresse IP Wi-Fi<\/li>\n\n\n\n<li>tourner le potentiom\u00e8tre<\/li>\n\n\n\n<li>souffler doucement pr\u00e8s du DHT22 pour voir varier l\u2019humidit\u00e9<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Bonnes pratiques<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>ne pas alimenter les entr\u00e9es ESP32 en 5 V<\/li>\n\n\n\n<li>utiliser un GPIO compatible analogique pour le potentiom\u00e8tre<\/li>\n\n\n\n<li>v\u00e9rifier le type du capteur : DHT11 ou DHT22<\/li>\n\n\n\n<li>\u00e9viter les lectures trop rapides du DHT22<\/li>\n\n\n\n<li>ne jamais publier les identifiants Wi-Fi dans un d\u00e9p\u00f4t public<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">R\u00e9capitulatif des fichiers importants<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Fichier \/ \u00e9l\u00e9ment<\/th><th>R\u00f4le<\/th><\/tr><\/thead><tbody><tr><td>Script <code>.ino<\/code><\/td><td>programme principal ESP32<\/td><\/tr><tr><td>Biblioth\u00e8que <code>WiFi.h<\/code><\/td><td>connexion Wi-Fi<\/td><\/tr><tr><td>Biblioth\u00e8que <code>DHT.h<\/code><\/td><td>lecture temp\u00e9rature\/humidit\u00e9<\/td><\/tr><tr><td>Moniteur s\u00e9rie<\/td><td>affichage et diagnostic<\/td><\/tr><tr><td>Carte ESP32 dans Arduino IDE<\/td><td>environnement de compilation<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Conclusion<\/h3>\n\n\n\n<p>Ce script constitue une premi\u00e8re base d\u2019objet connect\u00e9 avec ESP32.<br>Il permet de lire des grandeurs physiques, de se connecter au Wi-Fi et de pr\u00e9parer une \u00e9volution vers MQTT, API HTTP ou tableau de bord.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pour les \u00e9tudiants en BTS CIEL ou SIO, l\u2019ESP32 permet de cr\u00e9er rapidement des objets connect\u00e9s.Cette fiche pr\u00e9sente un script simple avec : Script ESP32 complet Explication d\u00e9taill\u00e9e Mat\u00e9riel utilis\u00e9 C\u00e2blage propos\u00e9 \u00c9l\u00e9ment ESP32 DHT22 VCC 3.3 V DHT22 GND GND DHT22 DATA GPIO 4 Potentiom\u00e8tre extr\u00e9mit\u00e9 1 3.3 V Potentiom\u00e8tre extr\u00e9mit\u00e9 2 GND Potentiom\u00e8tre [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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