/*********
  Rui Santos
  Complete project details at https://randomnerdtutorials.com  
*********/

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "DHT.h"

#define DHTPIN 2     // Define the digital pin where the DHT22 is connected
#define BUZZER_PIN 4
#define DHTTYPE DHT22

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  dht.begin();
  pinMode(BUZZER_PIN, OUTPUT);

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }

  display.clearDisplay();
  printMsg("Welcome to",30,15);
  printMsg("Smart irrigation",15,35);
  display.display();
  delay(3000);
 
}

void loop() {
  // Read temperature and humidity from the DHT sensor.
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  // Check if any reads failed and exit early (to try again).
  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  display.clearDisplay();
  
  // High temprature warning
  if(temperature > 50){
    printMsg("Warning!!!",30,15);
    printMsg("High Temprature",15,35);
    display.display();
    warningTone();
    delay(1000);
    return;
  }

  String humidityData = "Humidity:" + String(humidity) + " %";
  String temp = "Temp:" + String(temperature) + " C";

  printMsg("Smart irrigation",18,0);
  printMsg(humidityData,0,15);
  printMsg(temp,0,27);
  printMsg("Soil moisture: 20%",0,40);
  printMsg("Irrigate: Yes",0,55);
  display.display();
}

void printMsg(String msg, int xAxis,int yAxis){
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(xAxis, yAxis);
  // Display static text
  display.println(msg);
}

void warningTone(){
 for (int i = 0; i < 2; i++) {
    // High-pitched tone
    tone(BUZZER_PIN, 2500); // 2500 Hz frequency
    delay(100); // Play for 0.1 second
    noTone(BUZZER_PIN); // Turn off the buzzer
    delay(100); // Pause for 0.1 second

    // Medium-pitched tone
    tone(BUZZER_PIN, 1800); // 1800 Hz frequency
    delay(150); // Play for 0.15 second
    noTone(BUZZER_PIN); // Turn off the buzzer
    delay(100); // Pause for 0.1 second

    // Low-pitched tone
    tone(BUZZER_PIN, 1200); // 1200 Hz frequency
    delay(200); // Play for 0.2 second
    noTone(BUZZER_PIN); // Turn off the buzzer
    delay(100); // Pause for 0.1 second
  }
}