// Melissa Wells
// AE598
// Arduino Simulation
// 30NOV22

// This project takes a temperature sensor, reads the temperature and writes to 
//the SD card the analog reading. It also will output the temperature reading in 
//the output display for as long as the simulation is left running.

//Temperature was set for 25 deg C for what the sensor is monitoring environmentally



const float BETA = 3950;

#include <SD.h>
#define CS_PIN 10

File stuff;
int tempPin = A0;
int temp;

void setup() {

Serial.begin(9600);


Serial.print("SD Card Initializing...");

if (!SD.begin(CS_PIN)) {
  Serial.println("Card Failed");
  while(true);
}

Serial.println("Initialization Complete");

Serial.println("Files on card");
stuff = SD.open("/");
printDirectory(stuff,0);
Serial.println("");


// Writing Data to the Card for Output
temp = analogRead(A0);
float celsius1 = 1 / (log(1/ (1023. / temp - 1)) / BETA +1.0 / 298.15)-273.15;

File textFile = SD.open("/temp.txt", FILE_WRITE);

if (textFile){
  textFile.println("Testing whether things write");
  
  
  Serial.println("Writing Data Test Complete - Temperature Reading in Degrees C: ");
  Serial.println(celsius1);
  Serial.println();
  textFile.close();
  }
else {
  Serial.println("Error Writing File");
}

}


// Running Loop for Constant Display of Temperature
void loop() {

  int analogValue = analogRead(A0);
  float celsius = 1 / (log(1/ (1023. / analogValue - 1)) / BETA +1.0 / 298.15)-273.15;

  Serial.print("Temperature: ");
  Serial.print(celsius);
  Serial.println(" deg C");
  delay(1000);

  //Base coding for temperature sensor modified from reference [1], [2]
  
  

  //Base coding for SDcard modified from references [3] and [4] and class lecture notes. 
}






// Reading Data Off Card
void printDirectory(File dir, int numTabs) {
  while (true) {

    File entry =  dir.openNextFile();
    if (! entry) {
      break;
    }
    for (uint8_t i = 0; i < numTabs; i++) {
      Serial.print('\t');
    }
    Serial.print(entry.name());
    if (entry.isDirectory()) {
      Serial.println("/");
      printDirectory(entry, numTabs + 1);
    } 
    else {
      Serial.print("\t\t");
      Serial.println(entry.size(), DEC);
    }
    entry.close();
  }
}

// References
// [1] "Wokwi-NTC-Temperature-Sensor Reference," Wokwi, 2021. <https://docs.wokwi.com/parts/wokwi-ntc-temperature-sensor>
// [2] "Adafruit-ntc.ino," Wokwi, 2021. <https://wokwi.com/projects/299330254810382858>
// [3] "Wokwi-MicroSD-Card Reference," Wokwi, 2021. <https://docs.wokwi.com/parts/wokwi-microsd-card>
// [4] "Microsd-card-prototype-test.ino," Wokwi, 2021. <https://wokwi.com/projects/310542489623724609>