Servo Speed Control - arduino

Question

How can i make my servo do this but slower?
if(angle == 140)
angle = 159;
else
if(angle == 159)
angle = 140;
This is the whole code:
#include <Servo.h>
const int TOUCH_SENSOR_PIN = 6; // Arduino pin connected to touch sensor's pin
const int TOUCH_SENSOR_PIN2 = 7 ;
const int SERVO_PIN = 9; // Arduino pin connected to servo motor's pin
Servo servo; // create servo object to control a servo
// variables will change:
int angle = 140; // the current angle of servo motor
int lastTouchState; // the previous state of touch sensor
int currentTouchState; // the current state of touch sensor
int lastTouchState2; // the previous state of touch sensor 2
int currentTouchState2; // the current state of touch sensor 2
void setup() {
Serial.begin(9600); // initialize serial
pinMode(TOUCH_SENSOR_PIN, INPUT);
pinMode(TOUCH_SENSOR_PIN2, INPUT);
servo.attach(SERVO_PIN); // attaches the servo on pin 9 to the servo object
servo.write(angle);
currentTouchState = digitalRead(TOUCH_SENSOR_PIN);
currentTouchState2 = digitalRead(TOUCH_SENSOR_PIN2);
}
void loop() {
lastTouchState = currentTouchState; // save the last state
currentTouchState = digitalRead(TOUCH_SENSOR_PIN); //read new state
lastTouchState2 = currentTouchState2; // save the last state
currentTouchState2 = digitalRead(TOUCH_SENSOR_PIN2); //read new state
if((lastTouchState == LOW && currentTouchState == HIGH) || (lastTouchState2 == LOW && currentTouchState2 == HIGH)) {
if(angle == 140)
angle = 159;
else
if(angle == 159)
angle = 140;
// control servo motor arccoding to the angle
servo.write(angle);
} }

Answer 1

you can control the speed of the servo by making it rotating several little steps instead of giving it the final demand angle, something like this.
if(angle <= 140){
for (; angle<= 150; angle += 1) {
myservo.write(angle);
delay(15);
}
}
else if(angle >= 150){
for (; angle >= 140; angle -= 1) {
myservo.write(angle);
delay(15);
}
}
you can adjust the speed by changing the delay value in both for-loops.
A full working example can be found in the examples provided by the Arduino IDE under Servo -> Sweep I guess.