This a Sample Sketch for Controlling PanTilt Sg-90 servos with Thumb Joystick, programmed with gizDuino UNO-SE.

PanTilt_ThumbJS.ino

#include <Servo.h>

// Servo pins
#define servoApin	5
#define servoBpin	6

// Thumb Joystick pins
#define thumbYpin	A5
#define thumbXpin	A4
#define thumbBpin	A3

//Positions
#define max_X 160
#define max_Y 160
#define min_X 0
#define min_Y 0
#define homeX 90
#define homeY 90

// Servo Definitions
Servo servoA, servoB;

int currentX = homeX, currentY = homeY;

void setup(){
	Serial.begin(9600);
	
	//Pin Initializations
	servoA.attach(servoApin);
	servoB.attach(servoBpin);

	//Set to home
	servoA.write(homeX);
	servoB.write(homeY);
}

void loop(){
	//read from joystick
	int valueX = map(analogRead(thumbXpin), 0, 1024, -10, 10);
	int valueY = map(analogRead(thumbYpin), 0, 1000, -10, 10);
	Serial.print(analogRead(thumbYpin));
	Serial.print(F(" \t "));
	Serial.println(analogRead(thumbXpin));
	currentX = currentX + valueX;
	currentY = currentY + valueY;

	//constrain values
	currentX = constrain(currentX, min_X, max_X);
	currentY = constrain(currentY, min_Y, max_Y);
	
	//Write to servo
	servoA.write(currentX);
	servoB.write(currentY);

	//go back to home pos
	if((digitalRead(thumbBpin)) == LOW){
		currentY = homeY;
		currentX = homeX;
	}
	
	delay(15);
}