Please help with Bill acceptor project

code: [select]

http://i058.radikal.ru/1406/0d/46b487b9968b.jpg
my arduino project :
bill acceptor nv9 -1  button + 1 led , 1 realy
1)
when accept - 3,4,5,6 dollar
allow open -button + flash(led1) indicated - ready open( valve on relay)
relay timer - 1 minute open( valve on relay)
after 1 minute - close , reset arduino
2)
when accept - 10,11,12,13 dollar
allow open -button + flash(led1) indicated - ready open( valve on relay)
relay timer - 3 minute open( valve on relay)
after 3 minute - close , reset arduino

#include <wire.h>
#include <liquidcrystal_i2c.h>
const int relaypin = 4;
const int switchpin = 7;




liquidcrystal_i2c lcd(0x27,16,2); 
volatile byte cashcount = 0;
volatile byte bored = 0;

void setup()

{
  pinmode(switchpin,input);
  pinmode(relaypin,output);


  digitalwrite(switchpin,high);
  digitalwrite(relaypin,high);

  lcd.init();                     
  lcd.backlight();
  serial.begin(9600);
  attachinterrupt(0, caching, falling);
  delay(3000);
  cashcount = 0;
 
}


void caching()

{
  cashcount++;
}

void loop()
{
{
    digitalwrite(switchpin,high);
    digitalwrite(relaypin,high);

}
  bored = cashcount;
  if (cashcount == 0){
    serial.println("you have no grina!");
      hanginaround(); 
 
} else {

      serial.print("you have ");
      serial.print(cashcount);
      serial.println(" grivna.");
      lcd.clear();
      lcd.setcursor(0,0);
      lcd.print(" not love grivna");
      lcd.setcursor(2,1);
      lcd.print(cashcount);
      }
      hanginaround();
     
}

void hanginaround(){
  if (bored != cashcount){
    return;
    } else{
      hanginaround();
      }
      }

code: [select]

void hanginaround(){
  if (bored != cashcount){
    return;
    } else{
      hanginaround();
      }
      }

recursion?
big, big no-no.

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