Good day everyone . I'm here to ask some assistance. I am trying to build a joystick mouse and keyboard using arduino that will act as a ps/2 device for both. I am using the ps2dev library. I modify a code that I've seen online then I make the mouse work but I want to know how to adjust the cursor speed. Here's my code(this code works on me), If I want to adjust the cursor speed what should I change in this code?
Thanks in advance. 
#include "ps2dev.h"
PS2dev mouse(3,2); // 2 data 3clock
char buttons[3] = {0,0,0};
int delta_x = 0;
int delta_y = 0;
//we start off not enabled
int enabled =0;
//ack a host command
int buttonState = 0; // variable for reading the pushbutton status
int range = 12; // output range of X or Y movement
int responseDelay = 5; // response delay of the mouse, in ms
int threshold = range/4; // resting threshold
int center = range/2; // resting position value
const byte leftClick = 8; //assign the pins for the buttons
const byte rightClick = 9;
int delayTime = 8 ; //so the serial output is more readable
void ack() {
while(mouse.write(0xFA));
}
void write_packet() {
char overflowx =0;
char overflowy =0;
char data[3];
int x,y;
if (delta_x > 255) {
overflowx =1;
x=255;
}
if (delta_x < -255) {
overflowx = 1;
x=-255;
}
if (delta_y > 255) {
overflowy =1;
y=255;
}
if (delta_y < -255) {
overflowy = 1;
y=-255;
}
data[0] = ((overflowy & 1) << 7) |
( (overflowx & 1) << 6) |
( (((delta_y &0x100)>>8) & 1) << 5) |
( ( ((delta_x &0x100)>>8)& 1) << 4) |
( ( 1) << 3) |
( ( buttons[1] & 1) << 2) |
( ( buttons[2] & 1) << 1) |
( ( buttons[0] & 1) << 0) ;
data[1] = delta_x & 0xff;
data[2] = delta_y & 0xff;
mouse.write(data[0]);
mouse.write(data[1]);
mouse.write(data[2]);
delta_x = 0;
delta_y = 0;
}
int mousecommand(int command) {
unsigned char val;
//This implements enough mouse commands to get by, most of them are
//just acked without really doing anything
switch (command) {
case 0xFF: //reset
ack();
//the while loop lets us wait for the host to be ready
while(mouse.write(0xAA)!=0);
while(mouse.write(0x00)!=0);
break;
case 0xFE: //resend
ack();
break;
case 0xF6: //set defaults
//enter stream mode
ack();
break;
case 0xF5: //disable data reporting
//FM
ack();
break;
case 0xF4: //enable data reporting
//FM
enabled = 1;
ack();
break;
case 0xF3: //set sample rate
ack();
mouse.read(&val); // for now drop the new rate on the floor
// Serial.println(val,HEX);
ack();
break;
case 0xF2: //get device id
ack();
mouse.write(00);
break;
case 0xF0: //set remote mode
ack();
break;
case 0xEE: //set wrap mode
ack();
break;
case 0xEC: //reset wrap mode
ack();
break;
case 0xEB: //read data
ack();
write_packet();
break;
case 0xEA: //set stream mode
ack();
break;
case 0xE9: //status request
ack();
// send_status();
break;
case 0xE8: //set resolution
ack();
mouse.read(&val);
// Serial.println(val,HEX);
ack();
break;
case 0xE7: //set scaling 2:1
ack();
break;
case 0xE6: //set scaling 1:1
ack();
break;
}
}
int xcenter ;
int ycenter;
int xsum = 0;
int ysum = 0;
void setup(){
unsigned char val;
// send the mouse start up
while(mouse.write(0xAA)!=0);
//while(mouse.write(0x00)!=0);
delay(10);
pinMode(leftClick, INPUT); //set button pins to input
pinMode(rightClick, INPUT);
}
void loop(){
int xReading = readAxis(A0);
int yReading = readAxis(A1);
unsigned char c;
if( (digitalRead(3)==LOW) || (digitalRead(2) == LOW)) {
while(mouse.read(&c)) ;
mousecommand(c);
}
else //if (enabled)
{
delta_x = xReading;
delta_y = yReading;
write_packet() ;
}
buttonState = digitalRead(rightClick);
// check if the pushbutton is pressed.
// if it is, the buttonState is HIGH:
if (buttonState == HIGH) {
// turn LED on:
buttons[0] = 1;
delta_x = xReading;
delta_y = yReading;
write_packet() ;
}
else {
buttons[0] = 0;
write_packet() ;
}
delay(delayTime);
}
int readAxis(int thisAxis) {
// read the analog input:
int reading = analogRead(thisAxis);
// map the reading from the analog input range to the output range:
reading = map(reading, 0, 1023, 0, range);
// if the output reading is outside from the
// rest position threshold, use it:
int distance = reading - center;
if (abs(distance) < threshold) {
distance = 0;
}
// return the distance for this axis:
return distance;
}