/*

  ##########################################################
  ||                                                      ||
  || Title: Binary Counter with a 74HC595 Shift Register  ||
  ||                     Name: GC1CEO                     ||
  ||                   Date: 09/17/2024                   ||
  ||                     Attribution:                     ||
  ||          Based on shiftOutCode, Hello World          ||
  ||       by Carlyn Maw,Tom Igoe, David A. Mellis        ||
  ||         Date: 10/25/2006 Modified: 3/23/2010         ||
  ||                                                      ||
  ||                     Description:                     ||
  ||This counts from 0 to 255 on a 75HC595 Shift Register ||
  || and outputs the results on 8 segments of an LED bar  ||
  ||                        graph.                        ||
  ||                                                      ||
  ||                                                      ||
  ##########################################################

*/

//Pin connected to ST_CP (Storage Clock / Latch) of 74HC595
int latchPin = 8;
//Pin connected to SH_CP (Shift Clock) of 74HC595
int clockPin = 12;
////Pin connected to DS / SER (Data/Serial Input) of 74HC595
int dataPin = 11;
////Pin connected to inverted MR / SRCLR (Master Reset / Serial Register Clear) of 74HC595
int resetPin = 10;
////Pin connected to inverted OE (Output Enable) of 74HC595
int oePin = 9;

// delay between each number (in ms)
int delayTime = 1000;

void setup() {
  Serial.begin(9600);
  //set pins to output so you can control the shift register and setting button and pot pins to INPUT
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
  pinMode(resetPin, OUTPUT);
  pinMode(oePin, OUTPUT);


  // Setting reset to HIGH to stop reset and setting output enable to LOW to always enable output
  digitalWrite(resetPin, HIGH);
  digitalWrite(oePin, LOW);

  // Cleaning up serial monitor and announcing program has initalized and going to loop
  for (int a = 0 ; a < 25 ; a++) {
    Serial.println();

  }
}
void loop() {
  // count from 0 to 255 and display the number
  // on the LEDs
  Serial.print("Counting from 0 to 255!");
  Serial.println();

  // for loop to count from 0 to 255
  for (int numberToDisplay = 0; numberToDisplay < 255; numberToDisplay++) {


    // set the latch pin to low so LEDs dont change during shift

    digitalWrite(latchPin, LOW);
    // shift out the bits:
    shiftOut(dataPin, clockPin, MSBFIRST, numberToDisplay);
    //take the latch pin high so the LEDs will light up:
    digitalWrite(latchPin, HIGH);
    //print the number to serial

    Serial.print(String(numberToDisplay) + " ");

    // new line every 5 counts (and after the initial 0)
    if (numberToDisplay % 5 == 0) {
      Serial.println("");
    }


    // pause before next value
    delay(delayTime);
  }

  // Announcement that count has finished and is now restarting

  Serial.print("Count finished! Restarting!");
  Serial.println();
}