alex9ufo 聰明人求知心切: Wokwi ESP32 DHT22 & LED + Node-Red + Telegram

Wokwi ESP32 DHT22 & LED + Node-Red + Telegram

WOKWI程式

#include "WiFi.h";
#include <PubSubClient.h>;
#include <Wire.h>;
#include "DHTesp.h";
// DHT22 Pin
const int DHT_PIN = 15;
// LED Pin
const int ledPin = 4;

// Replace the next variables with your SSID/Password combination
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// Add your MQTT Broker IP address, example:
//const char* mqtt_server = "192.168.1.144";
const char* mqtt_server = "broker.mqttgo.io";
///const char* mqtt_server = "broker.hivemq.com";
//onst char* mqtt_server =  "test.mosquitto.org" ;

WiFiClient espClient;
PubSubClient client(espClient);
DHTesp dhtSensor;

bool Send = false;  //true
String LEDjson = "";
long lastMsg = 0;
//=================================================================

//===================================================================
void setup_wifi() {
  delay(10);
  // We start by connecting to a WiFi network
  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: ");
  Serial.println(WiFi.localIP());
}
//===================================================================
void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Message arrived on topic: ");
  Serial.print(topic);
  Serial.print(". Message: ");
  String messageTemp;
  
  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    messageTemp += (char)message[i];
  }
  Serial.println();

  // Feel free to add more if statements to control more GPIOs with MQTT

  // If a message is received on the topic esp32/output, you check if the message is either "on" or "off". 
  // Changes the output state according to the message
  if (String(topic) == "alex9ufo/esp32/output") {
    Serial.print("Changing output to ");
    if(messageTemp == "on"){
      Serial.println("on");
      digitalWrite(ledPin, HIGH);
      LEDjson ="LEDON";
      Send = true ;
      Serial.println(LEDjson);
    }
    else if(messageTemp == "off"){
      Serial.println("off");
      digitalWrite(ledPin, LOW);
      LEDjson ="LEDOFF";
      Send = true ;
      Serial.println(LEDjson);      
    }
  }
}
//===================================================================
void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    if (client.connect("ESP32Client")) {
      Serial.println("connected");
      // Subscribe
      client.subscribe("alex9ufo/esp32/output");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}
//===================================================================

//判斷 旗號Flash , Timer 是否為真
void LED_Message() {
  //判斷 旗號 Flash / timer  是否為真 ? 閃爍 定時
   
  ////判斷 旗號 Send 是否為真 回傳MQTT訊息到MQTT Broker　
  if (Send) {
    // Convert JSON string to character array
    Serial.print("Publish message: ");
    Serial.println(LEDjson);
    LEDjson.trim();
    client.publish("alex9ufo/esp32/ledstatus",LEDjson.c_str());
                       
    Send = false;    //處理過後 旗號 Send為假
  }

} 
//================================================================
void setup() {
  Serial.begin(115200);
  pinMode(ledPin, OUTPUT);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);

  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
  client.subscribe("alex9ufo/esp32/output");
  
}
//===================================================================
void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  
  LED_Message();
  long now = millis();
  if (now - lastMsg > 5000) {
    lastMsg = now;
    TempAndHumidity  data = dhtSensor.getTempAndHumidity();
    String temp = String(data.temperature, 2);
    Serial.print("Temperature: ");
    Serial.println(temp);
    client.publish("alex9ufo/esp32/temperature", temp.c_str());
    
    String hum = String(data.humidity, 1);
    Serial.print("Humidity: ");
    Serial.println(hum);
    client.publish("alex9ufo/esp32/humidity", hum.c_str());
  }
}
//===================================================================

Node-Red程式

alex9ufo 聰明人求知心切

2025年4月20日星期日

Wokwi ESP32 DHT22 & LED + Node-Red + Telegram

沒有留言:

張貼留言

8-QAM Signal 4 Phases 2 Amplitudes + 8PSK

2025年4月20日 星期日

Wokwi ESP32 DHT22 & LED + Node-Red + Telegram

沒有留言:

張貼留言

8-QAM Signal 4 Phases 2 Amplitudes + 8PSK

2025年4月20日星期日