#include <Adafruit_SSD1306.h>
#include <Adafruit_GFX.h>
#include <Wire.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET 7 
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define STEP_PIN 2
#define DIR_PIN 3
#define ENABLE_PIN 4
#define STEPS 10 

int PS,P=10,M,S,A,F;
int T1=20,T2=10;

void setup()
{   
  pinMode(STEP_PIN, OUTPUT);
  pinMode(DIR_PIN, OUTPUT);
  pinMode(ENABLE_PIN, OUTPUT);
  
  pinMode(A3,INPUT);

//  digitalWrite(ENABLE_PIN, LOW);  // Enable the driver (set low to enable)

  //Display  
    Wire.begin();
    if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C))  // Initialize the OLED display with the I2C address 0x3C
      {
        Serial.println(F("SSD1306 allocation failed"));
        for (;;);
      }

    display.clearDisplay();
    display.setTextSize(2);     
    display.setTextColor(SSD1306_WHITE);
    display.setCursor(23,10);   
    display.println(F("PROJECT"));  
    display.display();
    delay(50);
    display.setTextSize(3);      
    display.setCursor(36,32);    
    display.println(F("AOR")); 
    display.display();
    delay(50);
    display.clearDisplay();
    display.setTextSize(2);    
    display.setCursor(52, 13); 
    display.println(F("BY")); 
    display.setTextSize(2); 
    display.setCursor(40, 35);    
    display.println(F("MSAF"));
    display.display();
    delay(50);
    display.clearDisplay();
    display.display();

    display.setTextSize(1);     
    display.setTextColor(WHITE);


}

void loop()
{
  PS=analogRead(A3);
  PS=map(PS, 0, 1023, 0, 100);
  //Display
    display.setCursor(10,10);   
    display.print(F("SPO2: "));
    display.print(PS);
    display.display();
    display.clearDisplay();
  
//*********************************************

  if(PS<99)//TO INCREASE
  {
    P=0;
    if(PS<90)
      ClockV(100);
    else if(PS<95)
      ClockV(50);
    else if(PS<99)
      ClockV();
  }
  
  
//*********************************************
  CClockV(P);//TO DECREASE

  if(PS>=99)//TO DECREASE
  {
    P++;
    delay(1000);
    CClockV(P);
  }
  

//*********************************************

}

void ClockV()
{
  digitalWrite(DIR_PIN, HIGH); // Set the direction (HIGH for clockwise, LOW for counterclockwise)
  for (int i = 0; i < STEPS; i++) 
  {
    digitalWrite(STEP_PIN, HIGH);
    delay(T1);
    digitalWrite(STEP_PIN, LOW);
    delay(T1);
  }
}

void ClockV(int S)
{
  digitalWrite(DIR_PIN, HIGH); 
  for (int i = 0; i < S; i++) 
  {
    digitalWrite(STEP_PIN, HIGH);
    delay(T2);
    digitalWrite(STEP_PIN, LOW);
    delay(T2);
  }
}

void CClockV(int P)
{
  if(P==10)
  {
    digitalWrite(DIR_PIN, LOW); 
    for (int i = 0; i < STEPS; i++) 
    {
      digitalWrite(STEP_PIN, HIGH);
      delay(T1);
      digitalWrite(STEP_PIN, LOW);
      delay(T1);
    }
  }
}



/*



  




*/