#define arraySize(x) sizeof(x) / sizeof(x[0])
#include "KTS_Button.h"

KTS_Button buttonArray[] = { 7, 6, 5, 4 };

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

void loop() {
  for (int i = 0; i < arraySize(buttonArray); i++)
    if (buttonArray[i].read()) {
      Serial.print("Pressed - Button: ");
      Serial.println(i);
    }
}