#include <WiFi.h>
#include <PubSubClient.h>
#include <DHTesp.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
const int DHT_PIN = 15;
DHTesp dht;
const char* ssid = "Wokwi-GUEST"; // Wifi SSID
const char* password = "";
const char* mqtt_server = "test.mosquitto.org"; // Mosquitto server URL
WiFiClient espClient;
PubSubClient client(espClient);
unsigned long lastMsg = 0;
int led1 = 2; // Assigning the pins correctly
int led2 = 4; // Example pin
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 = "ESP32Client-";
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(led1, OUTPUT); // Set pins as outputs
pinMode(led2, OUTPUT); // Set pins as outputs
Serial.begin(115200);
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
lcd.init();
lcd.backlight();
dht.setup(DHT_PIN, DHTesp::DHT22);
}
void loop() {
if (!client.connected()) {
reconnect();
lcd.setCursor(0,0);
}
client.loop();
sendSensor();
}
void sendSensor() {
TempAndHumidity data = dht.getTempAndHumidity();
if (isnan(data.humidity) || isnan(data.temperature)) {
Serial.println("Failed to read from DHT sensor!");
return;
}
unsigned long now = millis();
if (now - lastMsg > 2000) { //perintah publish data
lastMsg = now;
String tempStr = String(data.temperature, 2);
client.publish("/IOT/Poltekkes/temp2", tempStr.c_str()); // publish temp topic /ThinkIOT/temp
String humStr = String(data.humidity, 1);
client.publish("/IOT/Poltekkes/hum2", humStr.c_str()); // publish hum topic /ThinkIOT/hum
lcd.setCursor(0, 0); // Set posisi kursor LCD baris 1
lcd.print("Suhu: "); // Tampilkan teks "Suhu: "
lcd.print(tempStr); // Tampilkan nilai suhu
lcd.print(" "); // Tampilkan satuan Celsius
lcd.print((char)223);
lcd.print("C");
lcd.setCursor(0, 1); // Set posisi kursor LCD baris 2
lcd.print("Kelembaban: "); // Tampilkan teks "Kelembaban: "
lcd.print(humStr); // Tampilkan nilai kelembaban
lcd.print(" %"); // Tampilkan persen kelembapan
delay(2000); // Jeda 2 detik
lcd.clear(); // Bersihkan tampilan LCD
Serial.print("Temperature: ");
Serial.println(tempStr);
Serial.print("Humidity: ");
Serial.println(humStr);
if (data.temperature > 35) {
digitalWrite(led1, HIGH);
} else {
digitalWrite(led1, LOW);
}
if (data.humidity > 50) {
digitalWrite(led2, HIGH);
} else {
digitalWrite(led2, LOW);
}
}
}