ObjectScoping

#define MOSPIN 5
#define CURRPIN A0
#define BATTVOLTPIN A1
#define SUPPLYVOLTPIN A2
#define CURRSENS analogRead(CURRPIN)
#define BATTVOLT analogRead(BATTVOLTPIN)
#define SUPPLYVOLT analogRead(SUPPLYVOLTPIN)
#define MOSDRIVE(x) analogWrite(MOSPIN,x)

int current, battVolts, supplyVolts, battCurrent;
float outPower;
String inputString = "";
boolean stringComplete;

// Timer class to keep track of different timeouts
class Timer
{
public:
    // timer in ms, toggle mode
    Timer(int _timer)
    {
        timer = _timer;
        setPoint = millis();
        state = false;
    }

    ~Timer() {}

    void update()
    {
        if(millis() - ticks > timer && !state)
            state = true;

        /* toggle mode
        if(millis() - ticks > timer && mode)
            state = !state;
        */
    }
    void timeout()
    {
        if(state)
        {
            state = false;
            return true;
        }
        else
            return false;
    }
private:
    uint64_t setPoint, timer;
    bool state;
};

Timer measureTimer(1000);
Timer shutdown(0);

// Class to calculate Rolling Average
class RollAvg
{
public:
    RollAvg(int n)
    {
        int totalReadings = n;
    }

    void push(float value) const
    {
        for (int i = totalReadings-1; i > 0; --i)
            readings[i] = readings[i-1];
        readings[0] = value;
    }

    float getAvg()
    {
        for (int i = 0; i < totalReadings; --i)
            sum += readings[i];
        return float(sum/totalReadings);
    }

    void reset()
    {
        for (int i = 0; i < totalReadings; ++i)
            readings[i] = 0;
    }
private:
    int totalReadings;
    int readings[totalReadings];
};

RollAvg avgPowerOut(100);
RollAvg avgCurrent(100);

void setup()
{
    Serial.begin(115200);
    pinMode(MOSPIN, OUTPUT);
    analogWrite(MOSPIN, 255);
    inputString.reserve(50);
}

void loop()
{
    randomSeed(CURRPIN);
    if(stringComplete)
        manCli();
}

// will run after every loop
void serialEvent()
{
    while (Serial.available())
    {
        char inChar = (char)Serial.read();
        inputString += inChar;
        if (inChar == '\n')
        stringComplete = true;
    }
}

void measure()
{
    current =  CURRSENS;
    battVolts = float(1609.7*BATTVOLT*3.3)/1023 ;
    supplyVolts = float(1609.7*SUPPLYVOLT*3.3)/1023;

    outPower = (supplyVolts*current)/1000;
    battCurrent = (supplyVolts*current)/battVolts;

    avgCurrent.push(current);
    avgPowerOut.push(outPower);

}

void manCli()
{
    if(inputString.equals("stats"))
        printDetails();
    else if(inputString.equals("help") || inputString.equals("?"))
    {
        Serial.println(F("shutdown <s>    :   disrupts power after specified seconds"));
        Serial.println(F("startup <s>     :   supplies power after specified seconds after shutdown"));
        Serial.println(F("limitPower <mW> :   limits power to specified mWatts in CV mode"));
        Serial.println(F("setTime <hh:mm> :   set local time"));
        Serial.println(F("stats           :   show power metrics and statistics"));
        Serial.println(F("config          :   show configuration"));
        Serial.println(F("help ; ?        :   display this message"));
    }
    else if((inputString.substring(0,7)).equals("shutdown"))
        Timer shutdown(inputString.parseInt());
}

void printDetails()
{
    Serial.print(F("Output Voltage: "));
    Serial.print(supplyVolts);
    Serial.print(F("mV\nOutput Current: "));
    Serial.print(current);
    Serial.print(F("mA\nPower Draw: "));
    Serial.print(outPower);
    Serial.print(F("mW\nBattery Voltage: "));
    Serial.print(battVolts);
    Serial.print(F("mV\nBattery Load: "));
    Serial.print(battCurrent + random(0,50));
    Serial.print(F("mA\nAverage Power Supply: "));
    Serial.print(avgPowerOut.getAvg())
}