#include <Wire.h>
double VOLTAGE; 
double P150; 
double P100;
double load = 0;
int Q150;
int Q100;
void setup() 
{
  Wire.begin(0x00);
  Serial.begin(9600);
  Serial.println("Enter Nominal System Voltage:");
  while (Serial.available() == 0){;}
  VOLTAGE = Serial.parseFloat(SKIP_ALL);
  Serial.print("System Voltage: ");
  Serial.println(VOLTAGE, DEC);
  P150 = (VOLTAGE*VOLTAGE)/150;
  P100 = (VOLTAGE*VOLTAGE)/100;
  Serial.println("Enter Load in kW:");
}

void loop() 
{
  Serial.flush();
  //while (!Serial.available()){;}
  double temp = Serial.parseFloat(SKIP_ALL)*1000;

  if((temp != load)&&(temp > 0))
  {
  load = temp;
  if(VOLTAGE <= 500) //We don't want to use the 100ohm resistors if the voltage is higher than 500 as they would draw excessive power. 
  {
  Q100 = load/P100;
  if(Q100 > 5) Q100=5;
  Q150 = (load - (Q100*P100))/P150;
  }
  else
  {
  Q150 = load/P150;
  Q100 = 0;
  }
  if(Q150 > 15) Q150 = 15;
  Serial.print("A combination of ");
  Serial.print(Q150, DEC);
  Serial.print(" 150ohm and ");
  Serial.print(Q100, DEC);
  Serial.print(" 100ohm resistors will be activated. ");
  //Serial.print(load - ((P150*Q150)+(P100*Q100)),DEC);
  Serial.print(((P150*Q150)+(P100*Q100)),DEC);
  Serial.println("W Accounted for.");
  }
  Wire.beginTransmission(0x01); //Controller Board Has Address 0x01
  Wire.write((Q150 << 3) & Q150);
  Wire.endTransmission();
}