Joystick turns a motor

// Session 3 - Joystick turns a motor
#include <Servo.h>      // the Servo library is built into the Arduino IDE

Servo myServo;
int xPin = A0;
int servoPin = 9;

void setup() {
  myServo.attach(servoPin);
}

void loop() {
  int x = analogRead(xPin);                 // 0 to 1023
  int angle = map(x, 0, 1023, 0, 180);      // squash that into 0 to 180 degrees
  myServo.write(angle);                     // go there!
  delay(15);                                // give the servo a moment to move
}

Keep the Session 2 fan circuit on the breadboard (L293D on pins 3, 4, 5) and plug the joystick's VRy into A1. The further forward you push, the faster the fan spins.

#include <Servo.h>

Servo myServo;
int xPin = A0;
int yPin = A1;
int servoPin = 9;

int enablePin = 5;   // L293D pin 1
int input1 = 3;      // L293D pin 2
int input2 = 4;      // L293D pin 7

void setup() {
  myServo.attach(servoPin);
  pinMode(enablePin, OUTPUT);
  pinMode(input1, OUTPUT);
  pinMode(input2, OUTPUT);
  digitalWrite(input1, HIGH);   // fan direction
  digitalWrite(input2, LOW);
}

void loop() {
  // servo follows left/right
  int x = analogRead(xPin);
  myServo.write(map(x, 0, 1023, 0, 180));

  // fan speed follows forward push
  int y = analogRead(yPin);
  int speed = 0;
  if (y < 400) {                               // pushed forward
    speed = map(y, 400, 0, 120, 255);          // further forward = faster
  }
  analogWrite(enablePin, speed);

  delay(15);
}