//**************************************************************//
//  Name    : Register74HC595                                   //
//  Author  : Andy.193                                          //
//  Date    : 04.07.2023                                        //
//  Version : 1.0                                               //
//  Notes   : Code for using a 74HC595 Shift Register           //
//          : to show the number from the Poti.                 //
//****************************************************************

//Pin connected to ST_CP of 74HC595
int latchPin = 4;
//Pin connected to SH_CP of 74HC595
int clockPin = 2;
////Pin connected to DS of 74HC595
int dataPin = 15;

void Register74HC595(int dataPin, int clockPin, int latchPin, String ShowOutput, int resetPin = 13, bool Present = true, bool WithDot = false){
    /*  
    //If COM+ then shiftOut() '+ DotDigit'
    const byte digitPatterns[] = {
        B11111100, // 0
        B01100000, // 1
        B11011010, // 2
        B11110010, // 3
        B01100110, // 4
        B10110110, // 5
        B10111110, // 6
        B11100000, // 7
        B11111110, // 8
        B11110110  // 9
    };*/

    //If COM- then shiftOut() '- DotDigit'
    const byte digitPatterns[] = {
        B00000011, // 0
        B10011111, // 1
        B00100101, // 2
        B00001101, // 3
        B10011001, // 4
        B01001001, // 5
        B01000001, // 6
        B00011111, // 7
        B00000001, // 8
        B00001001  // 9
    };

    for(int i = 0; i < ShowOutput.length(); i++){
        shiftOut(dataPin, clockPin, LSBFIRST, B00000000);
    }

    digitalWrite(resetPin, LOW);
    delay(10);
    if(Present) digitalWrite(resetPin, HIGH);

    digitalWrite(latchPin, LOW);
    for(int i = ShowOutput.length()-1; i >= 0; i--){
        int DotDigit = 0;
        if(i == ShowOutput.length()-1 && WithDot) DotDigit = 1;
        shiftOut(dataPin, clockPin, LSBFIRST, digitPatterns[String(ShowOutput[i]).toInt()] - DotDigit);
    }
    digitalWrite(latchPin, HIGH);
};


#define Poti 14
int MaxTime = 20;
int MinTime = 1;

void setup() {
  Serial.begin(115200);
    Serial.println("");
  //set pins to output because they are addressed in the main loop
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
  pinMode(13, OUTPUT);
  pinMode(Poti, INPUT);  
}

void loop(){
  String buffer = "";
  int PotiNumberInt = round(((MaxTime-MinTime)/4095.0)*analogRead(Poti) + MinTime);
  if(PotiNumberInt < 10) buffer = "0" + String(PotiNumberInt);
  else buffer = String(PotiNumberInt);
  Register74HC595(15, 2, 4, buffer, 13, true, true);
  delay(20);
}