// Test if two seperated 7-segment displays can be controlled by the SevSeg library.
// The single-digit display is located on the left of the four-digit display.
//
// SevSeg library: https://github.com/DeanIsMe/SevSeg
// Using the stringWithPeriod.ino sketch as starting point:
// https://github.com/DeanIsMe/SevSeg/blob/master/examples/stringWithPeriod/stringWithPeriod.ino
//
//
// Both displays are "common anode".
//

#include <SevSeg.h>
SevSeg sevseg;

unsigned long previousMillis;
const unsigned long interval = 500;
unsigned long previousMillisFast;
const unsigned long intervalFast = 100;

void setup() 
{
  byte numDigits = 5;
  byte digitPins[] = {6, 2, 3, 4, 5};  // single display, DIG1 ... DIG4
  byte segmentPins[] = {7, 9, 11, 12, 13, 8, 10}; // a...g

  bool resistorsOnSegments = false;    // 'false' means resistors are on digit pins
  byte hardwareConfig = COMMON_ANODE;  // See README.md for options
  bool updateWithDelays = false;       // Default. Recommended
  bool leadingZeros = false;           // Use 'true' if you'd like to keep the leading zeros
  bool noDecimalPoint = true;          // No decimal point in this project
  sevseg.begin(hardwareConfig, numDigits, digitPins, segmentPins, resistorsOnSegments, updateWithDelays, leadingZeros, noDecimalPoint);
  sevseg.setBrightness(100);           // 100 is default, 0...200
}

void loop() 
{
  unsigned long currentMillis = millis();
  bool update = false;                 // set default

  static int xr;
  int xm;
  static int xlfast;
  int xl;
  static int y;

  if( currentMillis - previousMillis >= interval)
  {
    previousMillis = currentMillis;
  
    // Two digits on the right, "xr"
    // Count up
    xr++;
    if( xr > 99)
      xr = 0;
    update = true;


    // One digit on the left, "xl"
    // Count up slow
    xlfast++;
    xl = xlfast / 4;
    if( xl > 9)
    {
      xlfast = 0;
      xl = 0;
    }
    update = true;


    // One digit on its own, "y"
    // count up and down
    static int inc = 1;
    y += inc;
    if( y == 9)
      inc = -1;
    if( y == 0)
      inc = +1;
    update = true;
  }


  if( currentMillis - previousMillisFast >= intervalFast)
  {
    previousMillisFast = currentMillis;

    // One digit in the middle, "xm"
    // set to random
    xm = random(0,10);
    update = true;
  }


  // Update the numbers if needed.
  if( update)
  {
    char buffer[10];
    snprintf( buffer, sizeof(buffer), "%1.1d%1.1d%1.1d%02.2d", y, xl, xm, xr);
    sevseg.setChars( buffer);
    update = false;
  }

  sevseg.refreshDisplay();             // This function keeps the displays going
}