How to make Arduino gamepad

1const int UpButton = 9;//9 and 11 pins both only work as per circuit rest  are not working as per circuit
2const int DownButton = 11;
3const int LeftButton  = 10;
4const int RightButton = 8;
5void setup(){
6   Serial.begin(9600);
7   pinMode(UpButton, INPUT);
8   pinMode(DownButton, INPUT);
9   pinMode(LeftButton,  INPUT);
10   pinMode(RightButton, INPUT);
11} 
12void loop(){
13    if(digitalRead(UpButton)  == HIGH){
14  //for(int i; i < 10; i++){ (this code is for to click button once  but run the player 10 times ps: delete this line only not for int etc u understand)
15    Serial.println("Up:");
16    delay(1);
17    }
18   //}
19    if(digitalRead(DownButton)  == HIGH){
20    //for(int i; i < 10; i++){
21    Serial.println("Down:");
22    delay(1);
23    //break;
24    }
25   //}
26    if(digitalRead(LeftButton)  == HIGH){
27    //for(int i; i < 10; i++){ 
28    Serial.println("Left:");
29    delay(1);
30    //break;
31    }
32   //}
33    if(digitalRead(RightButton)  == HIGH){
34    //for(int i; i < 10; i++){
35    Serial.println("Right:");
36    delay(1);
37    //break;
38    }
39   //}
40}

1import processing.serial.*;
2import java.awt.AWTException;
3import   java.awt.Robot;
4import java.awt.event.InputEvent;
5import java.awt.event.KeyEvent;
6import   javax.swing.KeyStroke;
7Serial MyPort;                                
8String   KeyString = "";
9void setup()
10{
11  System.out.println("Hi");
12  size(700,   500);
13  MyPort = new Serial(this, "COM3", 9600);// My Arduino is on COM3. Enter   the COM on which your Arduino is on.
14  MyPort.bufferUntil('\
15');
16}
17void   draw(){//Not really necessary
18  background(0, 0, 0);
19  fill(255, 10, 0);
20   text("Press any key this is non interactable screen open game or browser to test",   100, 175);
21}
22void serialEvent(Serial MyPort)throws Exception {
23   KeyString   = MyPort.readStringUntil('\
24');
25   KeyString = KeyString.substring(0, KeyString.indexOf(':'));//The   string is split. the whole string leaving the colon is taken
26   System.out.println(KeyString);//prints   the serial string for debugging purpose
27   Robot Arduino = new Robot();//Constructor   of robot class
28   switch(KeyString){
29     case "Up" :
30       Arduino.keyPress(KeyEvent.VK_W);//presses   up key.
31         delay(5);
32       Arduino.keyRelease(KeyEvent.VK_W);//releases   up key
33       break;
34     case "Down" :
35       Arduino.keyPress(KeyEvent.VK_S);///   CHANGE ACCORIND TO YOUR NEEDS more info here https://docs.oracle.com/javase/7/docs/api/java/awt/Robot.html
36         delay(5);
37       Arduino.keyRelease(KeyEvent.VK_S);
38       break;
39       case "Right" :
40       Arduino.keyPress(KeyEvent.VK_D);
41        delay(5);                                                                                                               
42        Arduino.keyRelease(KeyEvent.VK_D);
43       break;
44      case "LEFT"   :
45       Arduino.keyPress(KeyEvent.VK_A);
46        delay(5);
47       Arduino.keyRelease(KeyEvent.VK_A);       
48       break;
49   }
50   
51}

1const int UpButton = 9;//9 and 11 pins both only work as per circuit rest
2  are not working as per circuit
3const int DownButton = 11;
4const int LeftButton
5  = 10;
6const int RightButton = 8;
7void setup(){
8   Serial.begin(9600);
9
10   pinMode(UpButton, INPUT);
11   pinMode(DownButton, INPUT);
12   pinMode(LeftButton,
13  INPUT);
14   pinMode(RightButton, INPUT);
15} 
16void loop(){
17    if(digitalRead(UpButton)
18  == HIGH){
19  //for(int i; i < 10; i++){ (this code is for to click button once
20  but run the player 10 times ps: delete this line only not for int etc u understand)
21
22    Serial.println("Up:");
23    delay(1);
24    }
25   //}
26    if(digitalRead(DownButton)
27  == HIGH){
28    //for(int i; i < 10; i++){
29    Serial.println("Down:");
30
31    delay(1);
32    //break;
33    }
34   //}
35    if(digitalRead(LeftButton)
36  == HIGH){
37    //for(int i; i < 10; i++){ 
38    Serial.println("Left:");
39
40    delay(1);
41    //break;
42    }
43   //}
44    if(digitalRead(RightButton)
45  == HIGH){
46    //for(int i; i < 10; i++){
47    Serial.println("Right:");
48
49    delay(1);
50    //break;
51    }
52   //}
53}

1import processing.serial.*;
2import java.awt.AWTException;
3import  java.awt.Robot;
4import java.awt.event.InputEvent;
5import java.awt.event.KeyEvent;
6import  javax.swing.KeyStroke;
7Serial MyPort;                                
8String  KeyString = "";
9void setup()
10{
11  System.out.println("Hi");
12  size(700,  500);
13  MyPort = new Serial(this, "COM3", 9600);// My Arduino is on COM3. Enter  the COM on which your Arduino is on.
14  MyPort.bufferUntil('\n');
15}
16void  draw(){//Not really necessary
17  background(0, 0, 0);
18  fill(255, 10, 0);
19  text("Press any key this is non interactable screen open game or browser to test",  100, 175);
20}
21void serialEvent(Serial MyPort)throws Exception {
22   KeyString  = MyPort.readStringUntil('\n');
23   KeyString = KeyString.substring(0, KeyString.indexOf(':'));//The  string is split. the whole string leaving the colon is taken
24   System.out.println(KeyString);//prints  the serial string for debugging purpose
25   Robot Arduino = new Robot();//Constructor  of robot class
26   switch(KeyString){
27     case "Up" :
28       Arduino.keyPress(KeyEvent.VK_W);//presses  up key.
29         delay(5);
30       Arduino.keyRelease(KeyEvent.VK_W);//releases  up key
31       break;
32     case "Down" :
33       Arduino.keyPress(KeyEvent.VK_S);///  CHANGE ACCORIND TO YOUR NEEDS more info here https://docs.oracle.com/javase/7/docs/api/java/awt/Robot.html
34        delay(5);
35       Arduino.keyRelease(KeyEvent.VK_S);
36       break;
37      case "Right" :
38       Arduino.keyPress(KeyEvent.VK_D);
39        delay(5);                                                                                                              
40       Arduino.keyRelease(KeyEvent.VK_D);
41       break;
42      case "LEFT"  :
43       Arduino.keyPress(KeyEvent.VK_A);
44        delay(5);
45       Arduino.keyRelease(KeyEvent.VK_A);      
46       break;
47   }
48   
49}