#include <DHT.h>
#include <SoftwareSerial.h>

#define DHT_PIN 2  // Pin where the DHT22 is connected
#define AMMONIA_PIN A0  // Analog pin where the ammonia sensor is connected
#define PHONE_NUMBER "1234567890"  // Replace with the phone number to receive SMS alerts

DHT dht(DHT_PIN, DHT22);
SoftwareSerial sim800l(10, 11);  // RX, TX for SIM800L communication

void setup() {
  Serial.begin(9600);
  dht.begin();
  sim800l.begin(9600);
}

void loop() {
  delay(2000);  // Adjust the delay based on your requirements

  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  int ammoniaValue = analogRead(AMMONIA_PIN);

  if (temperature >= 28 && temperature <= 32 && ammoniaValue > YOUR_AMMONIA_THRESHOLD) {
    sendAlertSMS();
  }
}

void sendAlertSMS() {
  sim800l.println("AT+CMGF=1");  // Set SMS mode to text
  delay(1000);
  sim800l.print("AT+CMGS=\"");
  sim800l.print(PHONE_NUMBER);
  sim800l.println("\"");
  delay(1000);
  sim800l.print("Alert: Temperature and/or Ammonia levels exceeded!");
  sim800l.write(26);  // End with Ctrl+Z
  delay(1000);
}