#include <SPI.h>
#include <SoftwareSerial.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <nRF24L01.h>
#include <RF24.h>
 
RF24 radio(9, 10); // CE, CSN on Blue Pill
const uint64_t address = 0xF0F0F0F0E1LL;
 
#define ONE_WIRE_BUS 5
 
#define RE 8
#define DE 7
 
const byte code[] = {0x01, 0x03, 0x00, 0x1e, 0x00, 0x03, 0x65, 0xCD};
byte values[11];
SoftwareSerial mod(2, 3);
 
const int AirValue = 645;   //you need to replace this value with Value_1
const int WaterValue = 254;  //you need to replace this value with Value_2
int soilMoistureValue = 0;
int soilmoisturepercent = 0;
 
float  temperature;
int nitrogen;
int phosphorous;
int potassium;
 
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
 
struct MyVariable
{
  byte soilmoisturepercent;
  byte nitrogen;
  byte phosphorous;
  byte potassium;
  byte  temperature;
};
MyVariable variable;
 
 
void setup()
{
  Serial.begin(9600);
  mod.begin(9600);
  radio.begin();                  //Starting the Wireless communication
  radio.openWritingPipe(address); //Setting the address where we will send the data
  radio.setPALevel(RF24_PA_MIN);  //You can set it as minimum or maximum depending on the distance between the transmitter and receiver.
  radio.stopListening();          //This sets the module as transmitter
  sensors.begin();
  pinMode(RE, OUTPUT);
  pinMode(DE, OUTPUT);
}
 
void loop()
{
  byte val;
  digitalWrite(DE, HIGH);
  digitalWrite(RE, HIGH);
  delay(10);
  if (mod.write(code, sizeof(code)) == 8)
  {
    digitalWrite(DE, LOW);
    digitalWrite(RE, LOW);
    for (byte i = 0; i < 11; i++)
    {
      //Serial.print(mod.read(),HEX);
      values[i] = mod.read();
      Serial.print(values[i], HEX);
    }
    Serial.println();
  }
  nitrogen = values[4];
  phosphorous = values[6];
  potassium = values[8];
delay(1500);
 
  soilMoistureValue = analogRead(A0);  //put Sensor into soil
  //Serial.println(soilMoistureValue);
  soilmoisturepercent = map(soilMoistureValue, AirValue, WaterValue, 0, 100);
  {
    if (soilmoisturepercent >= 100)
    {
      soilmoisturepercent = 100;
    }
    else if (soilmoisturepercent <= 0)
    {
      soilmoisturepercent = 0;
    }
    else if (soilmoisturepercent > 0 && soilmoisturepercent < 100)
    {
      soilmoisturepercent = soilmoisturepercent;
    }
  }
  delay(1500);
 
  sensors.requestTemperatures();
  temperature = sensors.getTempCByIndex(0);
 
  variable.soilmoisturepercent = soilmoisturepercent;
  variable.nitrogen = nitrogen;
  variable.phosphorous = phosphorous;
  variable.potassium = potassium;
  variable.temperature = temperature;
  delay(1500);
 
 
  Serial.print("Soil Moisture: ");
  Serial.print(variable.soilmoisturepercent);
  Serial.println("%");
 
  Serial.print("Nitrogen: ");
  Serial.print(variable.nitrogen);
  Serial.println(" mg/kg");
  Serial.print("Phosphorous: ");
  Serial.print(variable.phosphorous);
  Serial.println(" mg/kg");
  Serial.print("Potassium: ");
  Serial.print(variable.potassium);
  Serial.println(" mg/kg");
 
  Serial.print("Temperature: ");
  Serial.print(variable.temperature);
  Serial.println("*C");
 
  Serial.println();
  radio.write(&variable, sizeof(MyVariable));
 
  Serial.println("Data Packet Sent");
  Serial.println("");
  delay(10000);
}