*/
#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <SoftwareSerial.h>

SoftwareSerial mySerial(5, 2);  // RX, TX


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


unsigned int Min_nitrogen = 10;           // You Can Change the minimum Value of Nitrogen
unsigned int Min_phosphorus = 10;        // You Can Change the minimum Value of phosphorus
unsigned int Min_potassium = 10;         // You Can Change the minimum Value of potassium
unsigned int Min_soilPH = 4;              // You Can Change the minimum Value of Soil PH
unsigned int Min_soilHumidity = 10;       // You Can Change the minimum Value of Soil Humidity
unsigned int Min_soilConductivity = 10;   // You Can Change the minimum Value of Soil Conductivity
unsigned int Min_Tem = 10;               // You Can Change the minimum Value of Soil Conductivity

#define OLED_RESET -1  // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);


int DE = 3;
int RE = 4;
int Buzzer = 12;
void setup() {
  Serial.begin(9600);
  if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;)
      ;  // Don't proceed, loop forever
  }      // Clear the buffer
  display.clearDisplay();
  // Display sensor data on OLED
  display.setTextSize(3);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(2, 20);
  display.print("Welcome");
  display.display();

  mySerial.begin(4800);
  pinMode(Buzzer, OUTPUT);
  digitalWrite(Buzzer, LOW);
  pinMode(DE, OUTPUT);
  pinMode(RE, OUTPUT);
  digitalWrite(Buzzer, HIGH);
  digitalWrite(DE, LOW);
  digitalWrite(RE, LOW);
  delay(1000);
  digitalWrite(Buzzer, LOW);
}

void loop() {
  byte queryData[] { 0x01, 0x03, 0x00, 0x00, 0x00, 0x07, 0x04, 0x08 };
  byte receivedData[19];
  digitalWrite(DE, HIGH);
  digitalWrite(RE, HIGH);

  mySerial.write(queryData, sizeof(queryData));  // send query data to NPK

  digitalWrite(DE, LOW);
  digitalWrite(RE, LOW);
  delay(1000);

  if ((mySerial.available() >= sizeof(receivedData))) {        // Check if there are enough bytes available to read
    mySerial.readBytes(receivedData, sizeof(receivedData));  // Read the received data into the receivedData array
    // Parse and print the received data in decimal format
    unsigned int soilHumidity = (receivedData[3] << 8) | receivedData[4];
    unsigned int soilTemperature = (receivedData[5] << 8) | receivedData[6];
    unsigned int soilConductivity = (receivedData[7] << 8) | receivedData[8];
    unsigned int soilPH = (receivedData[9] << 8) | receivedData[10];
    unsigned int nitrogen = (receivedData[11] << 8) | receivedData[12];
    unsigned int phosphorus = (receivedData[13] << 8) | receivedData[14];
    unsigned int potassium = (receivedData[15] << 8) | receivedData[16];

    // Clear the display
    display.clearDisplay();
    display.setTextSize(1);
    display.setTextColor(SSD1306_WHITE);
    display.setCursor(0, 0);
    display.print("Soil pH  : ");  // you an edit
    display.println((float)soilPH / 10.0);
    display.print("Humidi.: "); // you an edit
    display.print((float)soilHumidity / 10.0);
    display.println("%");
    display.print("Temp : ");  // you an edit
    display.print((float)soilTemperature / 10.0);
    display.println("C");
    display.print("Conductivity: "); // you an edit
    display.println(soilConductivity);
    display.setCursor(0, 35);
    display.print("Nitro. : "); // you an edit
    display.print(nitrogen);
    display.println("mg/Kg");
    display.print("Phos.: "); // you an edit
    display.print(phosphorus);
    display.println("mg/Kg");
    display.print("Pota. : "); // you an edit
    display.print(potassium);
    display.println("mg/Kg");
    // Display the buffer
    display.display();

    buzzerX(nitrogen, phosphorus, potassium,  soilHumidity,   soilConductivity,  soilPH, soilTemperature  );

  } else {
    Display();
  }
}

void Display() {  // Clear the buffer
  display.clearDisplay();
  display.setTextSize(3);
  display.setCursor(20, 20);
  display.print("ERROR");
  display.display();
}

void buzzerX(int nitrogen, int phosphorus, int  potassium, int  soilHumidity, int  soilConductivity, int  soilPH, int soilTemperature  ) {
  if (nitrogen < Min_nitrogen) {
    digitalWrite(12, 0);
  } else if (phosphorus < Min_phosphorus) {
    delay(100);
    digitalWrite(Buzzer, LOW);
  } else if (potassium < Min_potassium) {
    delay(100);
    digitalWrite(Buzzer, LOW);
  } else if ((soilHumidity / 10) < Min_soilHumidity) {
    delay(100);
    digitalWrite(Buzzer, LOW);
  } else if ((soilConductivity / 10)  < Min_soilConductivity) {
    delay(100);
    digitalWrite(Buzzer, LOW);
  } else if ((soilPH / 10)  < Min_soilPH) {
    delay(100);
    digitalWrite(Buzzer, LOW);
  }  else if ((soilTemperature  / 10)  < Min_Tem) {
    delay(100);
    digitalWrite(Buzzer, LOW);
  } else {
    delay(100);
    digitalWrite(Buzzer, HIGH);
  }
  delay(100);
}