/*********************************************************
 * Callisto power switch spawnded from CSV_Logger_TinyGPSPlus.ino
 * plan is to use gps data to turn on the DC power feed to the receivers from ~ 20:00 ut to about 09:50UT
 * uses software serial on pins 3 and 4 for GPS 
 * uses 'digital' time and is configured for South Aust to turn the power off at night
 * uses D6 as trigger for switch (an output pin)
 * Arduino Uno / nano board and GPS  shield
 * Blair 23/03/2021
 * *********************************************/
 
 #include <SPI.h>
// #include <SD.h>
 #include <TinyGPS++.h>


//const int chipSelect = 10; // was 4 think this was for the SD card
const int powerSw = 6;    // using pin 6 for trigger of switch high = on



 // data to be logged:
// #define LOG_COLUMN_COUNT 9
// char * log_col_names[LOG_COLUMN_COUNT] = 
//    {
//     "latitude","longitude", "nT","altitude", "speed", "course", "date", "time", "satellites" 
 //   };  // log column names printed out on top of file

 //Log Rate Control//

 #define LOG_RATE 5000 // log rate in milliseconds, was 5000 (5 seconds)
 unsigned long lastLog = 0 ; // global variable 


 //TinyGPS Definitions//
 TinyGPSPlus tinyGPS; // TinyGPS object to be used throughout
 #define GPS_BAUD 9600 // GPS modules default baud rate

 // GPS Serial Port Definitions//
 //If we are using the Uno, that uses 0/1 UART for programming / serial monitoring, then use the softwareSerial 
 #include <SoftwareSerial.h>
 #define ARDUINO_GPS_RX 4 //GPS TX , Arduino Rx pin
 #define ARDUINO_GPS_TX 3 // GPS Rx, Arduino Tx Pin
 SoftwareSerial ssGPS(ARDUINO_GPS_TX, ARDUINO_GPS_RX);// create a Software Serial object

 #define gpsPort ssGPS 

// #define SerialMonitor Serial
boolean swOn = false;
boolean pwrSwOn = false;
double TimeOn;            // time in UT that we want to turn the power ON
double TimeOff;           // time in UT that we want to turn the power OFF

float decimalTime ;
int myHours;
int myMinutes;
int mySeconds;

void setup() 
{
   // put your setup code here, to run once:
    Serial.begin(115200);
    gpsPort.begin(GPS_BAUD);
    Serial.println ("GPS power switch");
    
    pinMode(6, OUTPUT);  // using D6 (powersw  making it an output
    digitalWrite (powerSw, LOW);    // start it low  (off)
    TimeOn = 20.50;     //decimal hours  // time in UT that we want to turn the power ON
    TimeOff = 10.00;      //// time in UT that we want to turn the power OFF
}

void loop() 
{
   // put your main code here, to run repeatedly:
   if ((lastLog + LOG_RATE) <= millis())      //if greater than the millis + log then do
          {
           myHours = tinyGPS.time.hour();
           myMinutes = tinyGPS.time.minute();
           mySeconds = tinyGPS.time.second();
           decimalTime = (myHours * 1.0) + (myMinutes / 60.0 ) + (mySeconds/3600.0) ;
                   
           Serial.print ("Time On = ");
           Serial.print (TimeOn);
           
           Serial.print (" UT, Current Time = ");
           Serial.print (decimalTime , 4);
           
           Serial.print (" UT, Time Off = ");
           Serial.print (TimeOff);
            
           Serial.print (" UT, Power is ");
           
            if (pwrSwOn == true)
              {
                Serial.println ("ON");
              }
             if (pwrSwOn == false)
              {
                Serial.println ("OFF");
              }
            
            if ((decimalTime>=TimeOn)  || (decimalTime<=TimeOff))    // if >= 20UT or <=10UT turn it on
               { 
                  if (tinyGPS.location.isUpdated())// if the GPS data is valid
                    {
                       swOn = true;
                       lastLog = millis(); // update the lastlog (time) variable  
                    }
               }    
            if ((decimalTime> TimeOff) && (decimalTime < TimeOn ) )   // if > 10UT or < 20UT turn it off
               { 
                  if (tinyGPS.location.isUpdated())// if the GPS data is valid
                    {
                      swOn = false;
                      lastLog = millis(); // update the lastlog (time) variable  
                    }
               }      
          }
          
   while  (gpsPort.available())
      tinyGPS.encode(gpsPort.read());

      // following sets the on / off latch as needed

   if ((pwrSwOn != swOn) && (swOn == true) )         // if not on and need to turn on then sw on.
      {
      digitalWrite (powerSw, HIGH);    // turn it on
      pwrSwOn = swOn;
      Serial.println ("switch on");
      }
      
  if ((pwrSwOn != swOn) && (swOn == false) )         // if not off and need to turn off then sw off.
      {
      digitalWrite (powerSw, LOW);    // turn it off
      pwrSwOn = swOn;
      Serial.println ("switch off");
      }
    
}