enpk v2

#include <SoftwareSerial.h>
#include <Wire.h>

// RE and DE Pins set the RS485 module
// to Receiver or Transmitter mode
#define RE 8
#define DE 7

// Modbus RTU requests for reading NPK values
const byte nitro[] = {0x01,0x03, 0x00, 0x1e, 0x00, 0x02, 0xe4, 0x0c};
const byte phos[] = {0x01,0x03, 0x00, 0x1f, 0x00, 0x02, 0xb5, 0xcc};
const byte pota[] = {0x01,0x03, 0x00, 0x20, 0x00, 0x02, 0x85, 0xc0};

// A variable used to store NPK values
unsigned int values[3];

// Sets up a new SoftwareSerial object
// Digital pins 10 and 11 should be used with a Mega or Mega 2560
SoftwareSerial mod(2, 3);
//SoftwareSerial mod(10, 11);
 
void setup() {
  // Set the baud rate for the Serial port
  Serial.begin(9600);

  // Set the baud rate for the SerialSoftware object
  mod.begin(9600);

  // Define pin modes for RE and DE
  pinMode(RE, OUTPUT);
  pinMode(DE, OUTPUT);
  
  delay(500);
}
 
void loop() {
  // Read values
  values[0] = nitrogen();
  delay(250);
  values[1] = phosphorous();
  delay(250);
  values[2] = potassium();
  delay(250);

  // Print values to the serial monitor
  Serial.print("Nitrogen: ");
  Serial.print(values[0]);
  Serial.println(" mg/kg");
  Serial.print("Phosphorous: ");
  Serial.print(values[1]);
  Serial.println(" mg/kg");
  Serial.print("Potassium: ");
  Serial.print(values[2]);
  Serial.println(" mg/kg");
  
  delay(2000);
}
 
unsigned int nitrogen(){
  digitalWrite(DE,HIGH);
  digitalWrite(RE,HIGH);
  delay(10);
  if(mod.write(nitro,sizeof(nitro))==8){
    digitalWrite(DE,LOW);
    digitalWrite(RE,LOW);
    byte highByte = mod.read();
    byte lowByte = mod.read();
    if (result == node.ku8MBSuccess)
  {
    Serial.print("   Nitrogen: ");
    Serial.print(word(node.getResponseBuffer(0x0), node.getResponseBuffer(0x1)));
    Serial.println(" mg/kg");
  }

  }
}
 
unsigned int phosphorous(){
  digitalWrite(DE,HIGH);
  digitalWrite(RE,HIGH);
  delay(10);
  if(mod.write(phos,sizeof(phos))==8){
    digitalWrite(DE,LOW);
    digitalWrite(RE,LOW);
    byte highByte = mod.read();
    byte lowByte = mod.read();
    unsigned int value = word(highByte,lowByte);
    Serial.print(value);
    Serial.println();
    return value;
  }
}

unsigned int potassium(){
  digitalWrite(DE,HIGH);
  digitalWrite(RE,HIGH);
  delay(10);
  if(mod.write(pota,sizeof(pota))==8){
    digitalWrite(DE,LOW);
    digitalWrite(RE,LOW);
    byte highByte = mod.read();
    byte lowByte = mod.read();
    unsigned int value = word(highByte,lowByte);
    Serial.print(value);
    Serial.println();
    return value;
  }
}