/*
 https://thesolaruniverse.wordpress.com/2019/11/16/two-ways-to-control-a-ten-segment-led-bar-with-an-arduino/
 https://arduino.stackexchange.com/questions/17092/multiple-shift-registers-16-bit-numbers
 https://create.arduino.cc/projecthub/embeddedlab786/how-to-control-16-leds-with-74hc595-shift-register-423a9d
 https://github.com/Simsso/ShiftRegister74HC595/blob/master/examples/example/example.ino
*/
#include <ShiftRegister74HC595.h>


const int latchPin = 10;
// SH_CP pin 11
const int clockPin = 11;
// DS pin 14
const int dataPin = 12;

const int countLed = 16;

// parameters: <number of shift registers> (data pin, clock pin, latch pin)
ShiftRegister74HC595<2> sr(dataPin, clockPin, latchPin);



void setup (){
    /*
  pinMode (clockPin, OUTPUT);
  pinMode (latchPin, OUTPUT);
  pinMode (dataPin, OUTPUT);
  */
}


void loop (){

  // setting all pins at the same time to either HIGH or LOW
  sr.setAllHigh(); // set all pins HIGH
  delay(500);
  
  sr.setAllLow(); // set all pins LOW
  delay(500); 
  
  // setting single pins
  for (int i = 0; i < countLed; i++) {
    
    sr.set(i, HIGH); // set single pin HIGH
    delay(50); 
  }

  sr.setAllLow(); // set all pins LOW
  delay(500); 

  // set pins without immediate update
  sr.setNoUpdate(0, HIGH);
  sr.setNoUpdate(4, HIGH);
  sr.setNoUpdate(8, HIGH);
  sr.setNoUpdate(12, HIGH);
  // at this point of time, pin 0 and 1 did not change yet
  sr.updateRegisters(); // update the pins to the set values

  delay(1000);
  
}