/*
   BARGRAPH DISPLAY 
   Arduino code for Individual control over each pin
   Support for 40+ 74HC595 8 bit shift registers
   http://bildr.org/2011/02/74hc595/
   2024-14-marzo
*/

// chip 74HC595
#define DATA_PIN  8  // Pin connected to DS of 74HC595
#define LATCH_PIN 9  // Pin connected to STCP of 74HC595
#define CLOCK_PIN 10 // Pin connected to SHCP of 74HC595

// How many of the shift registers
#define NUM_SHIFT_REGS 2

const uint8_t numOfRegisterPins = NUM_SHIFT_REGS * 8;

bool registers[numOfRegisterPins];

// potenziometro
const int analogPin = A0;   // the pin that the potentiometer is attached to
const int ledCount = 10;    // the number of LEDs in the bar graph


void setup() { Serial.begin(9600);

  pinMode(DATA_PIN, OUTPUT);
  pinMode(CLOCK_PIN, OUTPUT);
  pinMode(LATCH_PIN, OUTPUT);
  clearRegisters();
  writeRegisters();
}

bool toggle = false;

void loop() {
  /*
  // read the potentiometer:
  int sensorReading = analogRead(analogPin);
  // map the result to a range from 0 to the number of LEDs:
  int ledLevel = map(sensorReading, 0, 1023, 0, ledCount);
  // scrive registro led da accendere
  clearRegisters();
  for (uint8_t i = 0; i < ledLevel; i++) {
    setRegisterPin(i, 1);
  }
  writeRegisters();
  delay(100);
  // ---------
  */

  // barra avanzamento ----
  for (int t=0; t<=1000; t++) {
    int ledLevel = map(t, 0, 1000, 0, ledCount);Serial.println(ledLevel);
  // scrive registro led da accendere
  clearRegisters();
  for (uint8_t i = 0; i < ledLevel; i++) {
    setRegisterPin(i, 1);
  }
  writeRegisters();
  
  delay(10);
  }
  // ---------

}

void clearRegisters() {
  // Reset all register pins
  for (int i = numOfRegisterPins - 1; i >= 0; i--) {
    registers[i] = LOW;
  }
}

void setRegisterPin(int index, int value) {
  // Set an individual pin HIGH or LOW
  registers[index] = value;
}

void writeRegisters() {
  // Set and display registers
  digitalWrite(LATCH_PIN, LOW);

  //for (int i = numOfRegisterPins - 1; i >= 0; i--) {
  for (int i = 10; i > 0; i--) {
    digitalWrite(CLOCK_PIN, LOW);
    digitalWrite(DATA_PIN, registers[i-1]);
    digitalWrite(CLOCK_PIN, HIGH);
  }

  digitalWrite(LATCH_PIN, HIGH);
}