# include <Servo.h>

Servo xServo;

# define VRX_PIN A0

# define left 6
# define right 7
# define doIt 8

void setup() {
  xServo.attach(9);

  pinMode(doIt, INPUT_PULLUP);
  pinMode(left, INPUT_PULLUP);
  pinMode(right, INPUT_PULLUP);
}

int xValue;
int xAngle;

void loop() {
  xValue = analogRead(VRX_PIN);

  bool command = digitalRead(doIt) == LOW;

  bool COMMAND_LEFT = digitalRead(left) == LOW;
  bool COMMAND_RIGHT = digitalRead(right) == LOW;

  if (command & COMMAND_LEFT) {xAngle = map(xValue, 0, 1023, 90, 180);  xServo.write(xAngle); delay(50);}
  if (command & COMMAND_RIGHT) {xAngle = map(xValue, 0, 1023, 90, 0);  xServo.write(xAngle); delay(50);}
}