int vrx;
int vry;
int up_led=6;
int down_led=9;
int left_led=10;
int right_led=11;

int up_led_voltage;
int down_led_voltage;
int left_led_voltage;
int right_led_voltage;

void setup() {
  // put your setup code here, to run once:
 pinMode(up_led, OUTPUT);
 pinMode(down_led, OUTPUT);
 pinMode(left_led, OUTPUT);
 pinMode(right_led, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  int vrx = analogRead(A1);
  int vry = analogRead(A2);

  left_led_voltage = (504-vrx)/20;
  left_led_voltage = left_led_voltage < 0 ? 0 : left_led_voltage;
  right_led_voltage = (vrx-502)/20;
  right_led_voltage = right_led_voltage < 0 ? 0: right_led_voltage;
  up_led_voltage = (522-vry)/20;
  up_led_voltage = up_led_voltage < 0 ? 0: up_led_voltage;
  down_led_voltage = (vry-520)/20;
  down_led_voltage = down_led_voltage < 0 ? 0: down_led_voltage;
  
  
  analogWrite(left_led, left_led_voltage);
  analogWrite(right_led, right_led_voltage);
  analogWrite(up_led, up_led_voltage);  
  analogWrite(down_led, down_led_voltage);  
}