#include <ModbusMaster.h>
#include <LiquidCrystal.h>


#define MAX485_DE      3
#define MAX485_RE_NEG  2

ModbusMaster node;
LiquidCrystal lcd(8,9,10,11,12,13);

void preTransmission()
{
  digitalWrite(MAX485_RE_NEG, 1);
  digitalWrite(MAX485_DE, 1);
}
void postTransmission()
{
  digitalWrite(MAX485_RE_NEG, 0);
  digitalWrite(MAX485_DE, 0);
}
void setup ()
{

  lcd.begin(16,2);
  lcd.print("CIRCUIT DIGEST");
  delay(3000);
  lcd.clear();
  lcd.print("Arduino");
  lcd.setCursor(0,1);
  lcd.print("Modbus Master");
  delay(3000);
  lcd.clear();

  pinMode(MAX485_RE_NEG, OUTPUT);
  pinMode(MAX485_DE, OUTPUT);

  pinMode(4,INPUT);
  pinMode(5,INPUT);

  digitalWrite(MAX485_RE_NEG, 0);
  digitalWrite(MAX485_DE, 0);

  Serial.begin(115200);
  // Modbus Slave ID 1
  node.begin(1, Serial);

  node.preTransmission(preTransmission);
  node.postTransmission(postTransmission);
}

void loop ()
{
 uint8_t result; 

  float value = analogRead(A0);
  
  result = node.writeSingleRegister(0x40000,value);

  lcd.setCursor(0,0);
  lcd.print("POT Val :");
  lcd.print(value);

  int a= digitalRead(4);
  int b= digitalRead(5);
   
   if (a == 1)
  {
    node.writeSingleRegister(0x40001,1);
    lcd.setCursor(0,1);
    lcd.print("S1: 1");
  }
  else
  {
    node.writeSingleRegister(0x40001,0);
    lcd.setCursor(0,1);
    lcd.print("S1: 0");
  }
    if (b == 1)
  {
    node.writeSingleRegister(0x40002,1);
    lcd.setCursor(8,1);
    lcd.print("S2: 1");
  }
  else
  {
    node.writeSingleRegister(0x40002,0);
    lcd.setCursor(8,1);
    lcd.print("S2: 0");
  }
}