 const int CLAW_PIN = 13;
 const int COIN_PIN = 8;
 
+// Serial enabled if GM_DEBUG is false.
 const bool GM_DEBUG = false;
 
 //

    
    // execute current state
    update_machine();      
  }
}


    Serial.println (state);
  }
  digitalWrite (pin, state ? HIGH : LOW);
}
