Code (platformio) capteur de température connecté wemos d1 mini

main.cpp

#include <Homie.h>
#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <DHT_U.h>

#define DHTPIN D4
#define DHTTYPE    DHT11     // DHT 11

DHT_Unified dht(DHTPIN, DHTTYPE);

const int TEMPERATURE_INTERVAL_MS = 1UL * 60UL * 1000UL;

unsigned long lastTemperatureSent = 0;

HomieNode temperatureNode("temperature", "temperature");

void setupHandler() {
  temperatureNode.setProperty("unit").send("c");
}

void loopHandler() {
  if (millis() - lastTemperatureSent >= TEMPERATURE_INTERVAL_MS || lastTemperatureSent == 0) {

    sensors_event_t event;
    dht.temperature().getEvent(&event);
    if (!isnan(event.temperature)) {
      //float temperature = 22; // Fake temperature here, for the example
      Homie.getLogger() << "Temperature: " << event.temperature << " °C" << endl;
      temperatureNode.setProperty("degrees").send(String(event.temperature));
      lastTemperatureSent = millis();
    }
   
  }
}

void setup() {
  Serial.begin(115200);
  Serial << endl << endl;

  dht.begin();

  Homie_setFirmware("awesome-temperature", "1.0.0");
  Homie.setResetTrigger(D1, LOW, 2000);
  Homie.setSetupFunction(setupHandler).setLoopFunction(loopHandler);

  temperatureNode.advertise("unit");
  temperatureNode.advertise("degrees");

  Homie.setup();
}

void loop() {
  Homie.loop();
}

platformio.ini

; PlatformIO Project Configuration File
;
;   Build options: build flags, source filter
;   Upload options: custom upload port, speed and extra flags
;   Library options: dependencies, extra library storages
;   Advanced options: extra scripting
;
; Please visit documentation for the other options and examples
; https://docs.platformio.org/page/projectconf.html

[env:d1_mini]
platform = espressif8266
board = d1_mini
framework = arduino
build_flags = -D PIO_FRAMEWORK_ARDUINO_LWIP2_LOW_MEMORY
lib_deps = Homie, DHT sensor library, Adafruit Unified Sensor

; Serial Monitor options
monitor_speed = 115200