// This code is by Chris Staecker
// You may use it for any purpose, without attribution

#include <TM1637Display.h>
// may have to install the above library, in standard repo

// connect stylus to pin 2, overlay sheet to GND (or the other way round- doesn't matter)
const int styluspin = 2;

// connections for display: CLK to 3, DIO to 4, VCC to 5V, GND to GND
const int clkpin = 3;
const int diopin = 4;

// connections for button: (viewed from front)
// bottom-left leg to 3V, bottom-right leg to 10K ohm resistor, then to GND, top-right leg to pin 5
const int buttonpin = 5;


TM1637Display display = TM1637Display(clkpin, diopin);

int count = 0;
bool contact = false;

int buttonpress = 0;

// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
  // make the stylus's pin an input:
  pinMode(styluspin, INPUT);

  digitalWrite(styluspin, HIGH); // writing a HIGH to an INPUT pin
    // connects the internal pullup resistor
    // see https://forum.arduino.cc/t/input-pin-always-reads-high-even-with-nothing/42310/11

  count = 0;

  // Set the brightness to 5 (0=dimmest 7=brightest)
  display.setBrightness(5);
  display.showNumberDec(0);

  pinMode(buttonpin, INPUT);
}

// the loop routine runs over and over again forever:
void loop() {

  // read the state of the pushbutton value:
  buttonpress = digitalRead(buttonpin);

  // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
  if (buttonpress == HIGH) {
    count = 0;
    
    display.showNumberDec(count);
  } 
  
  // read the input pin:
  int stylusstate = digitalRead(styluspin);

  if (stylusstate == HIGH) {
    contact = false;
  } else {
    if (not contact) {
      contact = true;
      count++;
      display.showNumberDec(count);
    }
      
  }
  delay(50);  // if delay is too small, it may register several hits, too big, may miss some



}