osu! touch keyboard

arduino.c

#include <CapacitiveSensor.h>

CapacitiveSensor   sens1 = CapacitiveSensor(8,6);
CapacitiveSensor   sens2 = CapacitiveSensor(4,2);

void setup() {
  
  sens1.set_CS_AutocaL_Millis(0xFFFFFFFF);
  sens2.set_CS_AutocaL_Millis(0xFFFFFFFF);
  Serial.begin(115200);
}

bool clickz = false;
bool clickx = false;

void loop() {

    long totalz =  sens1.capacitiveSensor(20);
    long totalx =  sens2.capacitiveSensor(20);
    
    if(totalz > 1000 && !clickz) {
      Serial.println("zp");
      clickz = true;
    }

    if(totalx > 1000 && !clickx) {
      Serial.println("xp");
      clickx = true;
    }
    
    if (totalz <= 1000 && clickz) {
      clickz = false;
      Serial.println("zr");
    }
    
    if (totalx <= 1000 && clickx) {
      clickx = false;
      Serial.println("xr");
    }
}

processing.java

import processing.serial.*;
import java.awt.AWTException;
import java.awt.Robot;
import java.awt.event.KeyEvent;

Serial myPort;
Robot robot;

void setup() {
  try { 
    robot = new Robot();
  } catch (Exception e) {
    e.printStackTrace();
    exit();
  }
  
  String portName = Serial.list()[0]; //change the 0 to a 1 or 2 etc. to match your port
  myPort = new Serial(this, portName, 115200);
}
void draw() {
  if (myPort.available() > 0) {
    String inBuffer = myPort.readStringUntil('\n');
    if (inBuffer != null) {                
        String val = new String(inBuffer).trim();
        if (val.equals("zp")) robot.keyPress(KeyEvent.VK_Z);
        if (val.equals("xp")) robot.keyPress(KeyEvent.VK_X);
        if (val.equals("zr")) robot.keyRelease(KeyEvent.VK_Z);
        if (val.equals("xr")) robot.keyRelease(KeyEvent.VK_X);
    }
  } 
}