/**
ESP32 + DHT22 Example for Wokwi
https://wokwi.com/arduino/projects/322410731508073042
*/
#include "DHTesp.h"
#include <WiFi.h>
#include "PubSubClient.h"
const char * MQTTServer = "broker.emqx.io";
const char * MQTT_Topic= "nhutthien/baodong";
const char * MQTT_ID = "fb925de4-7112-4662-b0b2-593f74ed1b73";
const char * MQTT_Topic1 = "nhutthien/nhietdo";
const char * MQTT_ID1 = "fb925de4-7112-4662-b0b2-593f74ed1b73";
const char * MQTT_Topic2 = "nhutthien/doam";
const char * MQTT_ID2 = "eedbad13-954c-481e-a97d-8cfbb5ded3a4";
int Port = 1883;
WiFiClient espClient;
PubSubClient client(espClient);
const int DHT_PIN = 15;
const int ledPin = 13;
DHTesp dhtSensor;
void WIFIConnect() {
Serial.println("Connecting to SSID: Wokwi-GUEST");
WiFi.begin("Wokwi-GUEST", "");
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("WiFi connected");
Serial.print(", IP address: ");
Serial.println(WiFi.localIP());
}
void MQTT_Reconnect() {
while (!client.connected()) {
if (client.connect(MQTT_ID)) {
Serial.print("MQTT Topic: ");
Serial.print(MQTT_Topic);
Serial.print(" connected");
client.subscribe(MQTT_Topic);
Serial.println("");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
delay(5000);
}
}
}
void MQTT1_Reconnect() {
while (!client.connected()) {
if (client.connect(MQTT_ID1)) {
Serial.print("MQTT Topic: ");
Serial.print(MQTT_Topic1);
Serial.print(" connected");
client.subscribe(MQTT_Topic1);
Serial.println("");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
delay(5000);
}
}
}
void MQTT2_Reconnect() {
while (!client.connected()) {
if (client.connect(MQTT_ID2)) {
Serial.print("MQTT Topic: ");
Serial.print(MQTT_Topic2);
Serial.print(" connected");
client.subscribe(MQTT_Topic2);
Serial.println("");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
delay(5000);
}
}
}
String stMessage;
void callback(char* topic, byte* message, unsigned int length) {
Serial.print("Message arrived on topic: ");
Serial.println(topic);
Serial.print("Message: ");
stMessage="";
for (int i = 0; i < length; i++) {
Serial.print((char)message[i]);
stMessage += (char)message[i];
}
Serial.println(stMessage);
}
void setup() {
Serial.begin(115200);
WIFIConnect();
client.setServer(MQTTServer, Port);
client.setCallback(callback);
client.subscribe(MQTT_Topic1);
client.subscribe(MQTT_Topic2);
dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
pinMode(ledPin, OUTPUT);
}
void loop() {
if (!client.connected()) {
MQTT_Reconnect();
MQTT1_Reconnect();
MQTT2_Reconnect();
}
client.loop();
TempAndHumidity data = dhtSensor.getTempAndHumidity();
String nhietdo=String(data.temperature, 2);
String doam=String(data.humidity, 1) ;
Serial.println("Nhiệt độ: " + nhietdo+ "°C");
Serial.println("Độ ẩm: " + doam+ "%");
Serial.println("---");
client.publish(MQTT_Topic1,nhietdo.c_str());
client.publish(MQTT_Topic2,doam.c_str());
delay(1000);
if(stMessage=="warningwarning"){
digitalWrite(ledPin,HIGH);
}
}