#include <math.h>

unsigned long shortTime;
unsigned long longTime;
int tempPin; // NOT USED ANYMORE
int lightPin;
float lightHigh = 0; // ARBIRARY NUMBER WHERE ANY RECORDING WILL BE LOWER
float lightLow = 10000; // ARBIRARY NUMBER WHERE ANY RECORDING WILL BE LOWER
//float TEMPDATA[6];
float LIGHTDATA[600]; // ARRAY THAT IS USED TO AVERAGE EVERY 10MIN
float currentAvg;
float rollingAvg;
int ind = 0;
int avgcount = 0;


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200); //BAUD 115200
  tempPin = analogRead(39); // PIN 39
  
}

float convertRead2Degs(int val) { // NOT USED ANYMORE

  float readVolts;
  float degC;
  readVolts = 5*val/4096;
  degC = log(((50 / readVolts) - 10)/28)/(-0.041);
  return degC;

}

float convertRead2Lux(int val) { // FOUND USING VOLTAGE DIVIDER AND DATA SHEET LOG-LOG DERIVATION
  float readVolts;
  float lux;
  readVolts = 3.3*val/4096;
  lux = exp(19.25/2-(3.3/(2*readVolts)));
  return lux;
}

/*float takeTenMinTempAvg() {
  float runningTotal;
  for (int i = 0; i < 6; i++) {
    runningTotal = runningTotal + TEMPDATA[i];
  }
  return runningTotal/6;
}*/

float takeTenMinLightAvg() {
  float runningTotal;
  for (int i = 0; i < 600; i++) {
    runningTotal = runningTotal + LIGHTDATA[i];
  }
  return runningTotal/600;
}

void findLightHigh(float val) { // FINDS HIGHEST LUX RECORDED
  
  if (val > lightHigh) {
    lightHigh = val;
  }
}

void findLightLow(float val) { // FINDS LOWEST LUX RECORDED

  if(val < lightLow) {
    lightLow = val;
  }
}

void findRollingAvg(float val) { // WILL AVG USING A ROLLING AVG EQN (CURRENT TOTAL AVG*QUANTITY + NEW ENTRY THEN DIVIDE BY NEW QUANTITY)

  rollingAvg = (rollingAvg*avgcount + val)/(avgcount+1);

}





void loop() {
  // put your main code here, to run repeatedly:
  
  
  if(millis() > (shortTime + 1000)) { // TAKE SENSOR DATA EVERY SECOND
    shortTime = millis();
    lightPin = analogRead(34);
    //TEMPDATA[ind] = convertRead2Degs(tempPin);
    LIGHTDATA[ind] = convertRead2Lux(lightPin);
    ind++;
  }
  

  if(millis() > (longTime + (600*1000))) { // DISPLAY AVG IN EXCEL EVERY 10 MIN
    longTime = millis();
    
    currentAvg = takeTenMinLightAvg();
    findLightHigh(currentAvg);
    findLightLow(currentAvg);
    findRollingAvg(currentAvg);
    Serial.print(currentAvg);
    Serial.print(",");
    Serial.print(lightHigh);
    Serial.print(",");
    Serial.print(lightLow);
    Serial.print(",");
    Serial.print(rollingAvg);
    Serial.println(" ");
    
    avgcount++;
    
    ind = 0;
  }
  
  
  //Serial.println(convertRead2Degs(tempPin));
  

  
}