#include <TM1637.h>
/*

This simulation program doesn't work, but it works with the 7segment and button.
There should be a 100 nF capacitor connected in parall with the button.

TM1637_RT library should be installed in the "Library Manager" tab first.
In Ver.0.3.8, ini() method is replaced by begin() method.
For details, refer to https://github.com/RobTillaart/TM1637_RT, Readme.md
*/


// pin declaration
#define CLK 13
#define DIO 3
#define B_PIN 2

// create a tm1637 object
TM1637 tm;

volatile long counter = 0; //displayInt() method asks for long type.


void push_int() //ISR
{
  delayMicroseconds(1000000);
  counter++;
}

void setup() {
  // put your setup code here, to run once:
  pinMode(B_PIN, INPUT_PULLUP);

  tm.begin(CLK, DIO, 4);
  tm.displayClear();
  
  attachInterrupt(digitalPinToInterrupt(B_PIN), push_int, FALLING);
  
}

void loop() {
  // put your main code here, to run repeatedly:
  if(counter <= 30)
    tm.displayInt(counter);
  else
    counter = 0;

  delay(500);

}