int buttonPin = 2;
int ledPin =  13;
int buttonState = 0;
int lastState = 0;
 
void setup() {
	Serial.begin(9600);
	pinMode(ledPin, OUTPUT);      
	pinMode(buttonPin, INPUT);     
}
 
void loop(){
	buttonState = digitalRead(buttonPin);
	if (buttonState == HIGH) {     
		digitalWrite(ledPin, HIGH);
		if(lastState == LOW)
		{
			Serial.print(1);
		}
	}else {
		digitalWrite(ledPin, LOW); 
	}
	lastState = buttonState;
}

#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <termios.h>
#include <unistd.h>
#include <xdo.h>
#include <X11/Xlib.h>
#include <X11/keysym.h>
 
int open_serial(char *port);
void close_serial(int fd);
 
int main()
{
	sleep(1); //wait 1 second
	printf("creating xdo...\n");
	xdo_t* myXdo = xdo_new(NULL);
	printf("xdo created...\n");
 
	printf("getting display...\n");
	// Obtain the X11 display.
		Display *display = XOpenDisplay(0);
		if(display == NULL)
		{
			printf("could not open display, exiting...\n");
			return -1;
		}
 
	printf("getting root window...\n");
	// Window focus
		int revert;
		Window winFocus;
 
	int fd = open_serial("/dev/ttyACM0");
	if(fd == 0)
	{
		printf("serial error, exiting...\n");
		return -1;
	}
	char buff;
	unsigned int rd;
 
 
	while(1)
	{
		rd = read(fd, &buff, 1);
		if(rd > 0)
		{
			printf("Read: %c\n", buff);
			XGetInputFocus(display, &winFocus, &revert);
			xdo_keysequence_up(myXdo, winFocus, "A",  12000);
			xdo_keysequence_down(myXdo, winFocus, "A",  12000);
		}
	}
 
	printf("exiting...\n");
	XCloseDisplay(display);
	xdo_free(myXdo);	
	close_serial(fd);
	return 0;
}
 
int open_serial(char *port)
{
	int fd = open(port, O_RDWR | O_NOCTTY | O_NDELAY);
	if(fd == -1)
	{
		printf("Could not open %s\n", port);
		return 0;
	}
	fcntl(fd, F_SETFL, 0);
	printf("Port %s has been sucessfully opened and %d is the file description\n", port, fd);
	return fd;
}
 
void close_serial(int fd)
{
	close(fd);
}