Mobile
esp8266 dht11
#include
#include
#include
#include “DHT.h”
// ====== CẤU HÌNH ======
const char* WIFI_SSID = “Loi”;
const char* WIFI_PASSWORD = “123456789”;
// WP endpoint theo plugin
const char* POST_URL = “https://dientu.vn/wp-json/esp32/v1/telemetry?key=dientuVN_2025_secretKey123”;
// DHT11 trên GPIO14 (D5)
#define DHTPIN 14
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
// LED cảnh báo (LED on-board NodeMCU = D4 = GPIO2)
#define LED_PIN 2
// Chu kỳ gửi
const unsigned long POST_INTERVAL_MS = 15000;
// Backoff tối đa khi lỗi
const unsigned long MAX_BACKOFF_MS = 60000;
unsigned long lastPost = 0;
unsigned long backoff = 0;
void waitBlink(unsigned long ms) {
unsigned long t0 = millis();
while (millis() – t0 < ms) delay(10);
}
void connectWiFi() {
if (WiFi.status() == WL_CONNECTED) return;
WiFi.mode(WIFI_STA);
WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
Serial.print("WiFi connecting");
uint32_t t0 = millis();
// LED nhấp nháy khi chưa kết nối
while (WiFi.status() != WL_CONNECTED) {
digitalWrite(LED_PIN, LOW); // LED sáng
delay(200);
digitalWrite(LED_PIN, HIGH); // LED tắt
delay(300);
Serial.print(".");
if (millis() - t0 > 20000) { // timeout 20s
Serial.println(“\n⚠️ WiFi FAIL → restart”);
ESP.restart();
}
}
Serial.printf(“\n✅ WiFi OK, IP: %s\n”, WiFi.localIP().toString().c_str());
digitalWrite(LED_PIN, HIGH); // LED tắt khi đã kết nối
}
bool postTelemetry(float tempC, float hum) {
std::unique_ptr client(new BearSSL::WiFiClientSecure);
client->setInsecure(); // test nhanh; khi chạy thật => dùng setTrustAnchors(…)
HTTPClient http;
if (!http.begin(*client, POST_URL)) {
Serial.println(“HTTP begin failed”);
return false;
}
http.addHeader(“Content-Type”, “application/json”);
String payload = String(“{\”temperature\”:”) + String(tempC, 1) +
String(“,\”humidity\”:”) + String(hum, 1) +
String(“,\”device\”:\”esp8266-01\”}”);
int code = http.POST(payload);
Serial.printf(“POST code=%d\n”, code);
if (code > 0) {
String resp = http.getString();
Serial.println(resp);
}
http.end();
return (code >= 200 && code < 300);
}
void setup() {
Serial.begin(115200);
delay(100);
dht.begin();
pinMode(LED_PIN, OUTPUT);
digitalWrite(LED_PIN, HIGH); // LED off ban đầu
connectWiFi();
}
void loop() {
// Nếu mất WiFi thì cảnh báo + tự kết nối lại
if (WiFi.status() != WL_CONNECTED) {
Serial.println("⚠️ WiFi lost → reconnecting...");
connectWiFi();
}
unsigned long now = millis();
unsigned long due = (backoff == 0) ? POST_INTERVAL_MS : backoff;
if (now - lastPost < due) return;
lastPost = now;
float h = dht.readHumidity();
float t = dht.readTemperature();
if (isnan(h) || isnan(t)) {
Serial.println("❌ DHT read failed");
return;
}
bool ok = postTelemetry(t, h);
if (ok) {
backoff = 0;
} else {
backoff = (backoff == 0) ? 5000 : backoff * 2;
if (backoff > MAX_BACKOFF_MS) backoff = MAX_BACKOFF_MS;
Serial.printf(“⚠️ POST fail → backoff %lu ms\n”, backoff);
}
}