#include <Arduino.h>

/*
 * Note 1: Averaging of voltage measurements will help reduce jitter
 *         and improve readability on the display of your choice.
 *         Try averaging over 100 or 1000 readings and see what works
 *         best in your project.
 *
 * Note 2: Using measured voltages and resistances instead of nominal
 *         values will improve the accuracy of your output.
 */

//physical values
double fiveVoltActual = 5.072; //the measured supply voltage to arduino chip
int cathodeResistorOhms = 387.2; //R7
double cathodeSensorOhms = 21770; //R2
double cathodeVoltageDividerOhms = 104870; //R1 + R2
double plateSensorOhms = 21830; //R11
double plateVoltageDividerOhms = 1017920; //R10 + R11

void setup(){

}

void loop() {

    //take voltage measurements
    double cathodeSensorVoltage = analogRead(A0) * (fiveVoltActual / 1023.0);
    double plateSensorVoltage = analogRead(A1) * (fiveVoltActual / 1023.0);

    //calculate current through R2
    double cathodeSensorCurrent = cathodeSensorVoltage / cathodeSensorOhms;
    //calculate voltage at cathode
    double cathodeVoltage = cathodeSensorCurrent * cathodeVoltageDividerOhms;
    //calculate current through R11
    double plateSensorCurrent = plateSensorVoltage / plateSensorOhms;
    //calculate plate voltage (minus cathode voltage)
    double plateVoltage = (plateSensorCurrent * plateVoltageDividerOhms) - cathodeVoltage;
    //calculate current through cathode resistor R7
    double cathodeCurrent = cathodeVoltage / cathodeResistorOhms;
    //calculate plate dissipation
    double plateDissipationPower = plateVoltage * cathodeCurrent;

    //send info to a display or whatever

}