#include <WiFi.h>
#include <PubSubClient.h>
#include <DHTesp.h>
///////////////////////////////////////////////////////////////
const int DHT_PIN = 15;
DHTesp dht;
const char* ssid = "Wokwi-GUEST"; /// wifi ssid
const char* password = "";
const char* mqtt_server = "mqtt.thingspeak.com";// server url
/////////////////////////////////////////////////////////////////
WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;
float temp = 0;
float hum = 0;
////////////////////////////////////////////////////////////////////
const int LED_GREEN_PIN = 18; // Change according to the connection of your ESP32
const int LED_RED_PIN = 5; // Change according to the connection of your ESP32
const int LED_YELLOW_PIN = 19; // Change according to the connection of your ESP32
/////////////////////////////////////////////////////////////////////
void setup_wifi() {
delay(10);
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
randomSeed(micros());
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
//////////////////////////////////////////////////////////////////
void callback(char* topic, byte* payload, unsigned int length) {
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
for (int i = 0; i < length; i++) {
Serial.print((char)payload[i]);
}
}
////////////////////////////////////////////////////////////////////
void reconnect() {
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
String clientId = "clientId-wfv7FD8aGG";
//clientId += String(random(0xffff), HEX);
if (client.connect(clientId.c_str())) {
Serial.println("Connected");
client.publish("/ThinkIOT/Publish", "Welcome");
client.subscribe("/ThinkIOT/Subscribe");
} else {
Serial.print("failed, rc=");
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
delay(5000);
}
}
}
/////////////////////////////////////////////////////////////////////
void setup() {
pinMode(2, OUTPUT);
Serial.begin(115200);
setup_wifi();
client.setServer(mqtt_server, 8884);
client.setCallback(callback);
dht.setup(DHT_PIN, DHTesp::DHT22);
pinMode(LED_GREEN_PIN, OUTPUT);
pinMode(LED_RED_PIN, OUTPUT);
pinMode(LED_YELLOW_PIN, OUTPUT);
}
///////////////////////////////////////////////////////////////////
void loop() {
if (!client.connected()) {
reconnect();
}
///////////////////////////
client.loop();
unsigned long now = millis();
if (now - lastMsg > 2000) { //perintah publish data
lastMsg = now;
TempAndHumidity data = dht.getTempAndHumidity();
String temp = String(data.temperature, 2);
client.publish("/ThinkIOT/temputs", temp.c_str()); // publish temp topic /ThinkIOT/temp
String hum = String(data.humidity, 1);
client.publish("/ThinkIOT/humuts", hum.c_str()); // publish hum topic /ThinkIOT/hum
Serial.print("Temperature: ");
Serial.println(temp);
Serial.print("Humidity: ");
Serial.println(hum);
// Get the current status of the LEDs
int status_green = digitalRead(LED_GREEN_PIN);
int status_red = digitalRead(LED_RED_PIN);
int status_yellow = digitalRead(LED_YELLOW_PIN);
// Control the LEDs according to the status
if (data.temperature < 24) {
digitalWrite(LED_YELLOW_PIN, LOW); // Encender LED amarillo si la temperatura es alta
} else {
digitalWrite(LED_YELLOW_PIN, HIGH); // Apagar LED amarillo si la temperatura es normal
}
//Control green led
if (data.temperature > 0) {
digitalWrite(LED_GREEN_PIN, HIGH); // Encender LED verde si latemperatura es mayor a 0
} else {
digitalWrite(LED_GREEN_PIN, LOW); // Apagar LED amarillo si latemperatura es normal
}
//control red led(possibility of non-functioning-erase)
if (data.temperature == 0) {
digitalWrite(LED_RED_PIN, HIGH); // Encender LED rojo si la temperatura es igual a 0
delay(1000); // Esperar 1 segundo
digitalWrite(LED_RED_PIN, LOW); // Apagar LED rojo después de 1 segundo
} else {
digitalWrite(LED_RED_PIN, LOW); // Asegurarse de que el LED rojo esté apagado si la temperatura es diferente de 0
}
}
}