#include <DHT.h>
#include <OneWire.h>
#include <DallasTemperature.h>
 
#define DHTPIN 14
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
 
// Soil Moisture (Potentiometer)
#define SOIL_MOISTURE_PIN 34
 
// Soil PH (NTC Thermistor – analog input)
#define SOIL_PH_PIN 35
 
// DS18B20 Soil Temperature
#define ONE_WIRE_BUS 4
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
 
// Relay + Pump Indicator LED
#define RELAY_PIN 5
#define LED_PIN 2
 
void setup() {
  Serial.begin(115200);
 
  pinMode(DHTPIN, INPUT_PULLUP);
  dht.begin();
  delay(2000);
  sensors.begin();
  sensors.setWaitForConversion(true);
 
  pinMode(RELAY_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);
 
  digitalWrite(RELAY_PIN, LOW);  // Pump off
  digitalWrite(LED_PIN, LOW);    // LED off
}
 
void loop() {
 
  // Read DHT22
  float airTemp = dht.readTemperature();
  float airHum  = dht.readHumidity();
 
  // Read Soil Moisture (0–4095)
  int soilMoistRaw = analogRead(SOIL_MOISTURE_PIN);
  int soilMoistPercent = map(soilMoistRaw,4095, 0, 0, 100);
 
  // Read Soil pH (simulated analog)
  int soilPhRaw = analogRead(SOIL_PH_PIN);
  float soilPH = map(soilPhRaw, 0, 4095, 3, 10); // Dummy conversion
 
  // Read DS18B20 Soil Temperature
  sensors.requestTemperatures();
  float soilTemp = sensors.getTempCByIndex(0);
 
  // Print all values
  Serial.println("========== Sensor Readings ==========");
  Serial.print("Air Temp (°C): "); Serial.println(airTemp);
  Serial.print("Air Humidity (%): "); Serial.println(airHum);
  Serial.print("Soil Moisture (%): "); Serial.println(soilMoistPercent);
  Serial.print("Soil pH: "); Serial.println(soilPH);
  Serial.print("Soil Temperature (°C): "); Serial.println(soilTemp);
  Serial.println("=====================================");
  Serial.println();
 
  // Pump control logic
  if (soilMoistPercent < 30) {
    digitalWrite(RELAY_PIN, HIGH);  // Turn pump ON
    digitalWrite(LED_PIN, HIGH);    // LED ON
    Serial.println("Pump: ON");
  } else {
    digitalWrite(RELAY_PIN, LOW);   // Pump OFF
    digitalWrite(LED_PIN, LOW);     // LED OFF
    Serial.println("Pump: OFF");
  }
 
  delay(2000);
}