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sistem pengurangan kelembapan menggunakan dehumidifier berbasis esp32 dengan integrasi LoRa

Receiver.ino

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+#include <SPI.h>
+#include <LoRa.h>
+#include <Wire.h>
+#include <LiquidCrystal_I2C.h>
+
+// Konfigurasi pin LoRa SX1278
+#define LORA_SCK 18
+#define LORA_MISO 19
+#define LORA_MOSI 23
+#define LORA_SS 5
+#define LORA_RST 14
+#define LORA_DIO0 2
+
+// Inisialisasi LCD I2C (alamat 0x27, 16 kolom, 2 baris)
+LiquidCrystal_I2C lcd(0x27, 16, 2);
+
+void setup() {
+  Serial.begin(115200);
+
+  // Inisialisasi LCD
+  lcd.begin();
+  lcd.backlight();
+  lcd.setCursor(0, 0);
+  lcd.print("Inisialisasi...");
+
+  // Inisialisasi LoRa
+  SPI.begin(LORA_SCK, LORA_MISO, LORA_MOSI, LORA_SS);
+  LoRa.setPins(LORA_SS, LORA_RST, LORA_DIO0);
+  if (!LoRa.begin(433E6)) {
+    lcd.setCursor(0, 1);
+    lcd.print("LoRa Gagal");
+    Serial.println("Gagal memulai LoRa");
+    while (1);
+  }
+
+  LoRa.setSyncWord(0xF3);
+  lcd.setCursor(0, 1);
+  lcd.print("LoRa OK        ");
+  Serial.println("Receiver siap...");
+  delay(2000);
+  lcd.clear();
+}
+
+void loop() {
+  int packetSize = LoRa.parsePacket();
+  if (packetSize) {
+    String dataMasuk = "";
+    while (LoRa.available()) {
+      dataMasuk += (char)LoRa.read();
+    }
+
+    int rssi = LoRa.packetRssi();
+    String jarak = "Tidak diketahui";
+    if (rssi >= -30) jarak = "Dekat";
+    else if (rssi >= -100) jarak = "Normal";
+    else if (rssi >= -150) jarak = "Jauh";
+    else jarak = "Sangat Jauh";
+
+    // Parsing data (misal: "Temp:28.4C, Hum:65.1%")
+    String suhuStr = "";
+    String humStr = "";
+
+    int indexTemp = dataMasuk.indexOf("Temp:");
+    int indexHum = dataMasuk.indexOf("Hum:");
+
+    if (indexTemp != -1 && indexHum != -1) {
+      suhuStr = dataMasuk.substring(indexTemp + 5, dataMasuk.indexOf("C"));
+      humStr = dataMasuk.substring(indexHum + 4, dataMasuk.indexOf("%"));
+    }
+
+    // Tampilkan di Serial Monitor
+    Serial.println("Data diterima: " + dataMasuk);
+    Serial.print("Suhu: ");
+    Serial.print(suhuStr);
+    Serial.println(" C");
+    Serial.print("Kelembapan: ");
+    Serial.print(humStr);
+    Serial.println(" %");
+    Serial.print("RSSI: ");
+    Serial.print(rssi);
+    Serial.print(" dBm, Perkiraan jarak: ");
+    Serial.println(jarak);
+    Serial.println("---------------------");
+
+    // Tampilkan di LCD
+    lcd.clear();
+    lcd.setCursor(0, 0);
+    lcd.print("T:");
+    lcd.print(suhuStr);
+    lcd.print((char)223); // Simbol derajat
+    lcd.print("C H:");
+    lcd.print(humStr);
+    lcd.print("%");
+
+    lcd.setCursor(0, 1);
+    lcd.print("Jarak: ");
+    lcd.print(jarak);
+    lcd.print("   ");
+  }
+}

dehumidifier-trasmiter.ino

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+#include <SPI.h>
+#include <LoRa.h>
+#include "DHT.h"
+
+// Konfigurasi Pin LoRa
+#define LORA_SCK     18
+#define LORA_MISO    19
+#define LORA_MOSI    23
+#define LORA_SS      5
+#define LORA_RST     14
+#define LORA_DIO0    2
+
+// DHT dan Relay
+#define DHTPIN 4
+#define DHTTYPE DHT11
+#define RELAY1 25
+#define RELAY2 26
+DHT dht(DHTPIN, DHTTYPE);
+
+void setup() {
+  Serial.begin(115200);
+  dht.begin();
+
+  pinMode(RELAY1, OUTPUT);
+  pinMode(RELAY2, OUTPUT);
+  digitalWrite(RELAY1, HIGH); // OFF default
+  digitalWrite(RELAY2, HIGH); // OFF default
+
+  SPI.begin(LORA_SCK, LORA_MISO, LORA_MOSI, LORA_SS);
+  LoRa.setPins(LORA_SS, LORA_RST, LORA_DIO0);
+
+  if (!LoRa.begin(433E6)) {
+    Serial.println("LoRa Gagal");
+    while (true);
+  }
+
+  LoRa.setSyncWord(0xF3);
+  Serial.println("LoRa OK");
+}
+
+void loop() {
+  float suhu = dht.readTemperature();
+  float hum = dht.readHumidity();
+
+  if (isnan(suhu) || isnan(hum)) {
+    Serial.println("Sensor Error!");
+    delay(3000);
+    return;
+  }
+
+  // Kendali relay berdasarkan kelembapan
+  String statusRelay;
+  if (hum < 40) {
+    digitalWrite(RELAY1, LOW);   // ON
+    digitalWrite(RELAY2, HIGH);  // OFF
+    statusRelay = "R1";
+  } else if (hum > 60) {
+    digitalWrite(RELAY1, LOW);   // ON
+    digitalWrite(RELAY2, LOW);   // ON
+    statusRelay = "R1R2";
+  } else {
+    digitalWrite(RELAY1, HIGH);  // OFF
+    digitalWrite(RELAY2, HIGH);  // OFF
+    statusRelay = "OFF";
+  }
+
+  // Menyusun pesan dengan suhu dan kelembapan
+  String message = "Temp:" + String(suhu, 1) + "C, Hum:" + String(hum, 1) + "%";
+
+  // Kirim data melalui LoRa
+  LoRa.beginPacket();
+  LoRa.print(message);
+  LoRa.endPacket();
+
+  // Tampilkan di Serial Monitor
+  Serial.println("Data dikirim: " + message);
+  Serial.println("Relay Status: " + statusRelay);
+
+  delay(5000);
+}