/*
  ZoeTrope Simulation Example

  Mech1010 - Arduino Outputs Lab

  Written by Pete Culmer 2023
*/

/* 
--------------------------------------------  
-------- Begin Initialise Variables --------
--------------------------------------------
*/

//STAGE 1
//*** DEFINE PINS HERE
const int LDR_pin = A0;
const int LED_pin = 2;
const int transistor_pin = 11;
//Add more...

//*** DEFINE VARIABLES HERE
int LDR_current = 0;
int LDR_previous = 0;
int motorcommand = 0;
unsigned long starttime = 0;
unsigned long currenttime = 0;
int slotcounter = 0;
float RPM = 0;
// etc etc

//*** DEFINE EXP PARAMETERS HERE
int slots_number = 11;
int LDR_background = 1023;
int LDR_threshold = 1223;
int LDR_step = 200;
//number of slots in zoetrope

//define variable for motor demand (0-255), 8-bit PWM. Start on at 50% demand.
int motorDemand = 127;

/* 
--------------------------------------------  
-------- End Initialise Variables ----------
--------------------------------------------
*/


/* 
----------------------------------  
-------- Begin Setup Loop --------
----------------------------------
*/

void setup() 
{

  // initialize serial communication at 115200 bits per second.
  Serial.begin(9600);
  //**** STAGE 2a **** 
  //Configure the Arduino Pins
  pinMode(LDR_pin, OUTPUT);
  pinMode(LED_pin, OUTPUT);
  pinMode(transistor_pin, OUTPUT);


  //**** STAGE 2b **** 
  //Turn things on....
  digitalWrite(LED_pin, HIGH);
  analogWrite(transistor_pin,127.5);

  //**** STAGE 2c *****   Find the background LDR value here
  find_LDR_background(); //you must write this function - see bottom of code!

}

/* 
-------------------------------
------- End Setup Loop --------
-------------------------------
*/

/* 
----------------------------------  
-------- Begin Main Loop ---------
----------------------------------
*/ 

void loop() 
{
  
  // **** STAGE 3 ****
  //initialise your counter
  slotcounter = 0;
  //find the start time 
  starttime=micros();
  currenttime=micros();
  
    
  // **** STAGE 3b **** MEASURE THE RPM OF THE ZOETROPE
  // ** Start DO WHILE loop here
  do{
    //read photo resistor
     int slotcounter_value=analogRead(A0);
    //if light threshold is crossed, increment cross count
     if(LDR_current>lowest_value && LDR_previous<lowest_value)
     {
      slotcounter_value=slotcounter_value+1;
     }
    //update previous LDRval
    
     }while(slotcounter<11);
  
	// ** End DO WHILE loop here
	// Loop while your counter is less than the number of slots on the wheel
  
  
  // **** STAGE 4 **** 
  //Find the end time of the rotation

  //Find the elapsed time for 1 rotation

  //
 
  
  //  **** STAGE 5 **** Automate the control?!


  // delay before starting again...
  delay(1000);
  Serial.print('\n');

 
}

/* 
----------------------------------  
--------- End Main Loop ----------
----------------------------------
*/ 



/* 
----------------------------------------------------------------------------- 
--------- Declare User Defined Functions to be called by Main Loop ----------
-----------------------------------------------------------------------------
*/ 

void printOutputs()
{
	// DEFINE YOUR FUNCTION HERE TO PRINT OUTPUTS - OPTIONAL!
}


int find_LDR_background()
{
  int value;
  int lowest_value = 10000000;
	for (int i=0; i<500; i++){
    value = analogRead(LDR_pin);
    if (value < lowest_value) {
      lowest_value = value;
    }
  }???
	return lowest_value;
}




/* 
--------------------------------------------------------------------------------- 
--------- End Declare User Defined Functions to be called by Main Loop ----------
---------------------------------------------------------------------------------
*/