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#include <Wire.h>
bool percentageLoad = false;
double VOLTAGE, P68, P150, PTotal;
double temp, currentLoad, load = 0;
uint8_t Q68, Q150;
bool new_message = false;
void setup()
{
Wire.begin();
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;
P68 = (VOLTAGE * VOLTAGE) / 68;
PTotal = P150+P68;
String input = "null";
Serial.println("Express load as a percentage? (y/n)");
while ((Serial.available() == 0)||(input!="y")||(input!="n"))
{
input = Serial.readString();
input.trim();
}
if(input=="y")
{
percentageLoad=true;
Serial.print("Enter Load as a percentage of ");
Serial.println(PTotal, DEC);
}
else
{
percentageLoad=false;
Serial.println("Enter Load in kW:");
}
}
void loop()
{
Serial.flush();
if (Serial.available())
{
if(percentageLoad) temp = Serial.parseFloat(SKIP_ALL) * 1000;
else temp = Serial.parseFloat(SKIP_ALL) * (PTotal/100.0);
}
if ((temp != load) && (temp > 0))
{
load = temp;
if (VOLTAGE <= 420) //We don't want to use the 68ohm resistors if the voltage is higher than 420 as they would draw excessive power.
{
Q68 = load / P68;
if (Q68 > 5) Q68 = 5;
Q150 = (load - (Q68 * P68)) / P150;
}
else
{
Q150 = load / P150;
Q68 = 0;
}
if (Q150 > 15) Q150 = 15;
Serial.print("A combination of ");
Serial.print(Q150, DEC);
Serial.print(" 150ohm and ");
Serial.print(Q68, DEC);
Serial.print(" 68ohm resistors will be requested. ");
//Serial.print(load - ((P150*Q150)+(P100*Q100)),DEC);
Serial.print(((P150 * Q150) + (P68 * Q68)), DEC);
Serial.println("W Accounted for.");
new_message = true;
}
delay(50);
Wire.beginTransmission(0x30); //Controller Board Has Address 0x07
Wire.write(0x01); //First "EEPROM Address" stores resistor data.
Wire.write((Q68 << 4) | Q150);
Wire.endTransmission();
if (new_message == true) {
delay(25);
Wire.requestFrom(0x30, 2);
while (!Wire.available()) {;}
int c = Wire.read();
currentLoad = ((c & 0b00001111)*P150)+(((c & 0b01110000)>>4)*P68);
if(currentLoad==load)
{
new_message=false;
Serial.println("***Load Matched***");
}
/*
Serial.print("Quantity of 150Ohm: ");
Serial.print(c & 0b00001111); //Print Q150
Serial.print(" Quantity of 68Ohm: ");
Serial.print((c & 0b01110000)>>4);
Serial.println(" was recieved.");
*/
}
}
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