Optical mouse hacking, part 1

Arduino driver for the ADNS2610 follows the cut, along with sample implementation and a fairly straightforward Processing app to read the data. The part most people will care about is the first chunk. You should easily be able to adapt it to other chips like the ADNS2051. In porting, pay close attention to the procedure for reading out the framebuffer, as that seems to be the primary difference between chips. The registers are all different but the routines for reading and writing over the serial line are essentially identical, right down to the timing. Credit is due to Martijn Thé, whose serial routines I adapted for this little project.

BTW, here’re the datasheets for the ADNS2610 and ADNS2051.

Bomb’s away:

 Serial driver for ADNS2010, by Conor Peterson (robotrobot@gmail.com)
 Serial I/O routines adapted from Martjin The and Beno?t Rosseau's work.
 Delay timings verified against ADNS2061 datasheet.
 The serial I/O routines are apparently the same across several Avago chips.
 It would be a good idea to reimplement this code in C++. The primary difference
 between, say, the ADNS2610 and the ADNS2051 are the schemes they use to dump the data
 (the ADNS2610 has an 18x18 framebuffer which can't be directly addressed).
 This code assumes SCLK is defined elsewhere to point to the ADNS's serial clock,
 with SDIO pointing to the data pin.

const byte regConfig    = 0x00;
const byte regStatus    = 0x01;
const byte regPixelData = 0x08;
const byte maskNoSleep  = 0x01;
const byte maskPID      = 0xE0;

void mouseInit(void)
  digitalWrite(SCLK, HIGH);
  digitalWrite(SCLK, LOW);
  digitalWrite(SCLK, HIGH);
  writeRegister(regConfig, maskNoSleep); //Force the mouse to be always on.

void dumpDiag(void)
  unsigned int val;

  val = readRegister(regStatus);

  Serial.print("Product ID: ");
  Serial.println( (unsigned int)((val & maskPID) >> 5));

void writeRegister(byte addr, byte data)
  byte i;

  addr |= 0x80; //Setting MSB high indicates a write operation.

  //Write the address
  pinMode (SDIO, OUTPUT);
  for (i = 8; i != 0; i--)
    digitalWrite (SCLK, LOW);
    digitalWrite (SDIO, addr & (1 << (i-1) ));
    digitalWrite (SCLK, HIGH);

  //Write the data    
  for (i = 8; i != 0; i--)
    digitalWrite (SCLK, LOW);
    digitalWrite (SDIO, data & (1 << (i-1) ));
    digitalWrite (SCLK, HIGH);

byte readRegister(byte addr)
  byte i;
  byte r = 0;

  //Write the address
  pinMode (SDIO, OUTPUT);
  for (i = 8; i != 0; i--)
    digitalWrite (SCLK, LOW);
    digitalWrite (SDIO, addr & (1 << (i-1) ));
    digitalWrite (SCLK, HIGH);

  pinMode (SDIO, INPUT);  //Switch the dataline from output to input
  delayMicroseconds(110);  //Wait (per the datasheet, the chip needs a minimum of 100 µsec to prepare the data)

  //Clock the data back in
  for (i = 8; i != 0; i--)
    digitalWrite (SCLK, LOW);
    digitalWrite (SCLK, HIGH);
    r |= (digitalRead (SDIO) << (i-1) );

  delayMicroseconds(110);  //Tailing delay guarantees >100 µsec before next transaction

  return r;

//ADNS2610 dumps a 324-byte array, so this function assumes arr points to a buffer of at least 324 bytes.
void readFrame(byte *arr)
  byte *pos;
  byte *uBound;
  unsigned long timeout;
  byte val;

  //Ask for a frame dump
  writeRegister(regPixelData, 0x2A);

  val = 0;
  pos = arr;
  uBound = arr + 325;

  timeout = millis() + 1000;

  //There are three terminating conditions from the following loop:
  //1. Receive the start-of-field indicator after reading in some data (Success!)
  //2. Pos overflows the upper bound of the array (Bad! Might happen if we miss the start-of-field marker for some reason.)
  //3. The loop runs for more than one second (Really bad! We're not talking to the chip properly.)
  while( millis() < timeout && pos < uBound)
    val = readRegister(regPixelData);

    //Only bother with the next bit if the pixel data is valid.
    if( !(val & 64) )

    //If we encounter a start-of-field indicator, and the cursor isn't at the first pixel,
    //then stop. ('Cause the last pixel was the end of the frame.)
    if( ( val & 128 ) 
      &&  ( pos != arr) )

    *pos = val & 63;


Sample implementation for Arduino. There are almost certainly better ways to do this; for instance, I’ve left in some debugging infrastructure that clutters things up some.

#define SDIO 3
#define SCLK 2

#define DLEDG 9
#define DLEDR 10
#define DLEDY 11
#define DLEDPERF 13

#define FRAMELENGTH 324
byte frame[FRAMELENGTH];

byte flop;

void setup()
  pinMode(SCLK, OUTPUT);
  pinMode(SDIO, OUTPUT); 

  pinMode(DLEDY, OUTPUT);
  pinMode(DLEDR, OUTPUT);
  pinMode(DLEDG, OUTPUT);

  flash(DLEDY, 1);
  flash(DLEDR, 1);
  flash(DLEDG, 1);
  flash(DLEDPERF, 1);

  flop = false;

  Serial.println("Serial established.");


void loop()
  unsigned int s;
  int input;  


  if( Serial.available() )
    input = Serial.read();
    switch( input )
    case 'f':
      Serial.println("Frame capture.");
    case 'd':
      for( input = 0; input < FRAMELENGTH; input++ )  //Reusing 'input' here
        Serial.print( (byte) frame[input] );
      Serial.print( (byte)127 );

void flash(byte pin, byte nTimes)
  while( nTimes-- )
    digitalWrite(pin, HIGH);
    digitalWrite(pin, LOW);

void flipLED(void)
  flop = !flop;
  digitalWrite(DLEDY, flop ? HIGH : LOW);

And the corresponding visualizer, written for Processing. Again, slightly idiosyncratic, it would benefit from another draft. But this should be good enough to get anybody started.

import processing.serial.*;

final int rate = 38400;
final int off_x = 75;
final int off_y = 70;
final int sz = 22;
final int frameX = 18;
final int frameY = 18;
final int frameLen = frameX * frameY;

Serial port;
int[] frame;
int serialCounter;

int nextFrameTime;
int framePeriod = 300;

void setup()
  size( 550, 550 ); 


  frame = new int[frameLen];


  nextFrameTime = millis();

void draw()

  if( millis() >= nextFrameTime )


    for( int i = 0; i < frameLen; i++ )
      fill( map(frame[i], 0, 63, 0, 255) );
      rect(off_x + (i % frameX * sz),
      off_y  + (i / frameY * sz),
      sz, sz);
    nextFrameTime = millis() + framePeriod;

void keyPressed()
  if( key == 'f' )

  if( key  == ' ' )

void initSerial()
  String portName = Serial.list()[0];
  port = new Serial(this, portName, rate);
  println("Using " + portName + " as serial device.");

void requestFrame()

  serialCounter = frameLen;

void serialHandler()
  int incoming;
  while( port.available() != 0 )
    incoming = port.read();
    //print(incoming + " ");
    if( serialCounter > 0 )
      if( incoming == 127 )
        serialCounter = 0;
        frame[serialCounter - 1] = incoming;
    • Thomas
    • February 20th, 2011

    Hi~ The work that shown here is great. I would like to know can I do that for newer adns sensor, such as adns9500, and not in arduino?

    • Good question. Consulting the data sheet, it looks like the ADNS9500 uses a three-wire serial interface, and does indeed support some kind of frame capture. (See page 19, http://www.avagotech.com/docs/AV02-1726EN)

      The “driver” presented above would probably need to be heavily modified or rewritten to work with the newer mouse.

      Also, I doubt you’d be able to pull 11,000 FPS out of the ADNS chip. At least for the ones I was playing with, the frame capture feature was clearly meant for debugging and prototyping and could do only a few frames per second, as you can see near the end of the video.

      And as far as getting away from arduino — yes, if you wanted to do the same thing with any other microcontroller, of course it would work. Many AVRs have native support for three wire serial; the atmegas, and some of the attinys too. (Look for TWI or USI in the datasheets). You’d get much better performance writing the code directly for the AVR in C, skipping the arduino interface. But the nice thing about arduino is being able to dump the frame data via USB with a minimum of fuss…

      Good luck!

      • sandeep
      • November 2nd, 2012

      Hello thomas

      Could you please tell me which board/controller you hav used to get the image from adns9500..

  1. Well, you are such a nice guy and reply me with that detail. Thanks a lot!
    Actually, I am doing a final year project which my supervisor as me to make the adns9500 and arduino together. I think I’d better to work on a better microcontroller!

    • Ritesh
    • April 11th, 2011

    what differences and modification do i have to do to interface the c2165 optical sensor with this program??
    I tried a program to read the X ,Y coordinates of the mouse, the library(in arduino) was for adns 2610. I coonected the Data pin 4 to where the SDIO was to be connected and the clock pin 5 to where the SCLK was to be connected in the arduino…. but i ended up getting some rubbish values that made no sense!! any suggestions?

    P.S. … i dint solder the wires to the C2165 pins rather i used the USB cables that were already soldered to these pins(Vcc,Gnd,Data and Clock) . Does that make any difference?

    BTW great post!!

    • Hey, sorry it took me so long to get around to this.

      Man, I don’t know anything about the C2165 optical sensor. Even if the pinout were exactly the same as the ADNS2610, you’d probably have to adapt my program so that the arduino communicates properly with it, since the procedure for dumping a frame is almost assuredly different. What you might do is look in the 2165’s datasheet for how the serial communications work and use my code as a template. The overall project is fairly modular so you should be able to reuse at least some of my work.

    • Arthur
    • December 17th, 2011

    Which arduino hardware did you use for this? I was hoping to run this application such that I may attach another lens to get it to operate at a distance of 3 inches. If you could let me know which model you used that would be great. Thanks.

    • Hey,

      I used an Arduino Duemilanove. It should be compatible with pretty much any Arduino though, are you having problems?

    • Arthur
    • December 17th, 2011

    No problems yet, I just wanted to make sure I get the correct one before I ordered it, I was going to order the Arduino Uno.

    • Arthur
    • December 17th, 2011

    is there anything I need to make the Arduino work besides the software online? I noticed they sell a starter kit and was wondering if there is anything in there I may need or is it ready to go?

    • For this project you just need some wires and a little skill with the soldering iron. I like 22 gauge solid core hookup wire. The kit’s useful if you want to dink around with other projects … comes with buttons, pots, a couple of sensors, LEDs and resistors, a USB cable, a tiny breadboard, and some deluxe jumper wires. More useful, I think, would be a bare-bones Arduino Uno plus a Jameco grab bag of grab bags: look up “GB197” at Jameco.com.

      One last thing, the code I posted is pretty specific to the ADNS2610 optical sensor. Sometimes people are surprised it doesn’t work with whatever random mouse they have sitting on the junkpile.

      Good luck with the lens part, I hope you report back!

    • Arthur
    • December 21st, 2011

    I tried to copy and paste the code into a new sketch and I got a number of errors. Do I need to save it as .cpp or .h because right now I have it saved as .ino. Also, do I need to create a library or what? I get undeclared scope for the most part and error: expected constructor, destructor, or type conversion before ‘int’. Please let me know what I may do to justify the errors. I have only tried to verify and I get these problems. Thanks.

    • Hi Arthur,

      So the code on this blog is in three blocks. The first two are to be pasted into an Arduino sketch, the third is actually for Processing (http://www.processing.org).

      Due to the way I presented the code on the blog, the Arduino code blocks are switched: you actually want to copy and paste the second block of code (the one that starts with all the #defines) into a blank sketch, then add the code in the first block (the one that starts with the comment block and the const byte lines.) The sketch should compile to 4094 bytes.

      You don’t have to make a library or save it under any other file name or extension. (Although, I like to put the ADNS2610 driver in its own tab, to keep things neat.)

      The third block of code isn’t in C/C++ at all, it’s actually Java, and is meant to be pasted into a blank Processing sketch. Arduino will naturally choke on this code if you mistakenly paste it in.

      Happy solstice!

    • Ritchie
    • January 3rd, 2012

    Is it possible to do this with only the ADNS 2610 and no other elements with the exception of the LED? Also, what mouse did you use I would like to see this work before I start to make modifications. Thanks

    • Hi Ritchie,

      Yes. All the other electronics inside the mouse are superfluous. In the video, the mouse shares its power supply with the Arduino and the data is sent over our own wires, effectively bypassing all the other junk on the board. You do, however, need to use the lens and obviously the LED.*

      I don’t recall the precise model of mouse that I used, but it was a black Logitech USB model with a scrollwheel, circa early/mid 2000s, the kind you might find in bulk in the back of some IT department’s storage room.

      I’ve redone the same hack with other ADNS sensors but the method for reading/writing the framebuffer usually varies from chip to chip. My advice is to crack open several mice, google the sensor and obtain a datasheet, and get to work on whichever sensor looks easiest.

      I also want to say here that, generally, the frame dump functionality in optical mice is intended to be used by engineers who are debugging their designs (testing for focus clarity, etc.). The update rate is so slow that you have almost no hope of doing any useful realtime analysis. For those of you out there who are after position data — maybe you’re building a robot? — you’re much better off just asking the sensor for the mouse dX/dY directly. :)

      Good luck,


      * PS: I lied. There’s one very interesting use for these chips even sans LED and lens: low-budget optical interferometry. More information: http://en.wikipedia.org/wiki/Interferometry

    • Arthur
    • January 4th, 2012

    What pins did you use for this? I tried PWM ~3 and 2 and I did not get a result. However, I tried connecting the 2610 directly with no other elements connected. Will this affect it? Also, what are the led’s for? Are you using them as a test? Thanks


    • Arthur
    • January 4th, 2012

    Sorry I see where you defined the pins. But if you could let me know about my other questions in the previous post that would be great. Thanks.

    • Hi Arthur,

      The LEDs are just there to help debug the program. You can safely leave them disconnected. Actually, sometimes I don’t even bother hooking up the LEDs in my designs; I’ll just watch the pin with an oscilloscope if I care to peek.

      You almost certainly do not need the other elements on the mouse’s circuit board, with the exception of the mouse’s red LED. You really do need to leave that one connected.

      One other thing — at circa 2:38 in the original video, the gnd/+5v label is WRONG. I just checked the ADNS2610 data sheet. Pin 6 is GND, pin 7 is +5v. So, alter your connections accordingly. I’ve annotated the video so that this is clear.


    • Arthur
    • January 7th, 2012

    I ran everything, and hooked up all the components and I get a black screen on the processing application. Is this normal? Should I at the very least get some kind of motion detected? I shined the LED directly onto the lens and there is no motion of any kind. Any suggestions?

      • Arthur
      • January 12th, 2012

      Under the processing app I get

      Warning: RXTX Version Mismatch
      Jar version = RXTX 2.2pre1
      native lib version = RXTX-2.2pre2

      Is this why the processing is showing a blank screen? How do you suppose I can handle this issue?

        • Arthur
        • January 15th, 2012

        OK, so I googled this issue and some other people had the same problem in which case I went to the following website


        It gives a step by step in how to fix the warning. it did fix the warning in the sense that I have all the correct libraries.
        After which I get

        Stable Library

        Native lib Version = RXTX-2.1-7
        Java lib Version = RXTX-2.1-7
        Usin COM3 as a serial device.

        I cannot see the bottom of your processing sketch, but can you tell me what it says. I am using COM7 as my arduino port, any suggestions on how to rectify this?

        It did not however help me to display an image. I get a blank screen with a little white box in the bottom corner. If there is anything you can think of that might fix this please let me know. I am sorry for posting so much on your sight, I could really use the help though.

    • Charles
    • January 18th, 2012

    Hi conor,

    Regarding the serial communication between arduino and processing, did you use the serial monitor to key in the ‘f’ or other characters, or u are pressing those key on the processing’s side … cause i’m facing serial port in use problem when trying to get the serial monitor and processing gui being active together …

    • Hi Charles,

      Once the arduino firmware is uploaded, you don’t need the arduino software (or its serial console) open anymore. This should free up the serial port for Processing.

      The commands CAN be typed in from the Arduino serial console for purposes of debugging if you wish.

      Also, for what it’s worth, some other people are having problems getting the Processing sketch to run in the first place; apparently the serial library is broken in Processing 1.5.1. If that is also an issue for you, I recommend rolling back to 1.2.1, still available on the project’s google code site: https://code.google.com/p/processing/downloads/list

      Good luck!


        • Charles
        • January 19th, 2012

        Hi conor,

        Thanks for the reply.

        My problem is kinda opposite from the others. My Processing sketch just keep running on its on, those pixel is moving even though the mouse is not being moved. Did you encounter this problem before ?

        Thanks again !

      • Do the pixels look like actual image data? If you’re getting legit data from the sensor, it should resemble a microscopic view of the surface (albiet at very low resolution.)

        If it’s junk data after all, then you’re probably having issues with serial communication to the mouse sensor. There could be a number of reasons — bad wiring (did you see that the labels in the video were wrong? oops.), blown sensor, etc.

        Also, note that info on some other chips is floating around on the internet, for example, another reader reports that Sparkfun is selling an ADNS2620 breakout board. I glanced at the datasheet, it looks like the driver I wrote for the ADNS2610 needs to be modified if it’s going to be used with other chips. So this may not describe your scenario, but I wanted to get the information out there in case anybody else is having issues.

      • Alexandre
      • April 9th, 2013

      Hi Charles,

      I would like to know if you have found a solution to your proccesing problem because I’m currently facing up to the same problem.

  2. Hey thanks so much for sharing this great project. I’m having a strange problem in which the project works great only under an older version of the arduino IDE. Specifically, it works with OSX version 0021, but not OSX version 1.0. Under 1.0, it gives back bad data that looks like a light gray grid in the processing app. Any thoughts?

    • Good catch, I haven’t tried to run this code in ages. Checking the release notes (http://arduino.cc/en/Main/ReleaseNotes), it looks like there were a bunch of changes made to the serial library for 1.0.

      I don’t have time to re-write the code, but here are my thoughts:
      First, change if( Serial.available() ) to be a ‘while’ loop. Second, omit Serial.flush(). Third, it’s awkward that I’m using Serial.print() lines on data that’s cast to byte; it would make more sense to just use Serial.write() and avoid the casts. When I wrote that code, I don’t think I understood the difference between write and print.

      I don’t see much to change in the processing code, but you might want to verify that the data is being sent correctly. Perhaps put a debug routine in the arduino firmware to spit out a known sequence of characters and see if it lands in Processing correctly.

      Good luck!

      • Interesting. I will try what you suggest and let you know. In the meantime, using the older version of the arduino IDE is working fine for me.

    • Xen
    • March 16th, 2012

    Congratulations conor you’re a bright kid never forget that, there will be persons that will understand also what you already know.

    • GR0B
    • March 25th, 2012

    Have you tried using a lens off a webcam/camera or creating a basic pinhole lens? could yet you open up the uses to more then just scanning a surface.

    • I have done this with the lens from a cheapo ebay security camera. It totally works, though it can be tricky to focus.

    • Youssef
    • April 19th, 2012

    It didn’t work for me, I used pan301 sensor and used the first arduino code but I modified it so it includes an empty loop and setup and declared the sck to pin 4 and sdio to pin 5:
    int SCK = 4;
    int SDIO = 5;
    please send help to:youssefaly@rocketmail.com

    • Armando
    • May 5th, 2012

    Thanks for the video Connor. I had a bit of inspiration watching it! I’m trying to design a linear MoCo camera slider and one of the challenges has been how to get very tight (+ / – .1mm) distance measurements along up to 4m of travel… I’m thinking the guts of an optical mouse really needs to be quite precise and with the right reflective surface it could do the trick!

  3. Velly intarestink. I am trying to read the X & Y registers only. No pictures or anything. It must be simpler than I am making it. Do I have to have any drivers? why can’t I just initialize the mouse chip, enter register addreses and read the registers? I am very learned in electronics but am a new nubie in programming. the last programming I die was on a 6502 in machine language. Could you please point me to a simple routine? All the examples I have found are to do with the “camera” possibilities .

    • Hi Bill,

      You can do exactly that — send the mouse chip some commands, write to the correct registers, and receive data back. Exactly what registers to write to are obviously going to depend on the chip, and you probably have to initialize the mouse first. To be clear, you ARE writing a driver!

      I can’t write a specific routine for you but check out the data sheet for your optical mouse chip. The basic procedure is typically to write an address and then a command, with either a TWI or an I2C protocol. TWI is simple to implement by bit-banging (i.e. on the Arduino, calling digitalWrite() to make the pins high or low). Check out my readRegister() and writeRegister() routines to get started. (It would help if you read them alongside the datasheet for the 2610, for which they were originally written).

      IIRC, optical mice usually store the x/y delta since the last read. Those are the registers you want to access. It’s up to your application to translate those values into an absolute position and to refresh as quickly as possible.

      Good luck,
      Conor Peterson

    • Hugo
    • September 6th, 2012

    Hello Conor, sorry to be a bother, but as I use the code? Not compiles. How to put the functions in the code. I’m still new at this programming.

      • Hugo
      • September 6th, 2012

      I got, sorry. lol

      showed me this message

      Serial established.
      Product ID: 7

      But the processing does not appear anything. How can I see if I am receiving sensor values​​?
      I destroy this mouse to solder the pins of the sensor, but I have a usb Shielder for arduino, its possible do this experiment but using the usb communication?

      Thank you for attention

        • Hugo
        • September 11th, 2012

        someone? :)

    • Hugo
    • September 12th, 2012

    Ei Conor, i have a mouse with the sensor PAN3511, but i cant make the scanner, i make what you did, but dont work i dont know why. Can you help me? Is important.

    my mail is hugocapucho@gmail.com, if you can help me i send my print screens. thanks a lot

    • Divyanshu
    • September 25th, 2012

    hey, i have a old mouse using chip n1165 , but i cant find its datasheet… how to integrate this one on your project…

  4. Hi Conor,this is Prabhakar from INDIA,your videos looks great …thank u for the good job.
    i try to download your code to my arduino uno. and i tried to capture few letters from newspaper.but i got some pixel in processing window and not the exact content in news paper..
    I also tried using black paper but i didn’t get a black image..
    can u help me?

    my mail id is aprabhakaran.mit@gmail.com

    Thanks a lot..

    • Constantine
    • December 17th, 2012

    Can someone share a code as a file, because a copy/paste from this page misses some symbols (like zeros)
    Thank you

  5. thanks a lot !!

      • Prabhakaran
      • March 4th, 2013

      How can i acquire delta y data from ADNS 2610 sensor
      by modifying the program…
      i refered datasheed and tried modifying code but got no variation …
      can u help me??

    • Yvonne
    • March 29th, 2013

    Hi Conor,

    I love the hack. Have been trying to get it working as i’d love to use the sensor to scan/quantitate bound parasites. managed to track down an A2610 sensor, wired it up, fired up the arduino and Processing, but all i get is a black screen (im on OS X mountain lion). All indications point to the arduino talking to the mouse, but nothing with Processing. I saw a few other people post they had the same issue above. Do you have any suggestions?



    • Hi,

      Indeed, you’re not alone – in the four years since I posted this there have been tons of issues with Processing, the RXTX library and others. Owing to folks’ continual interest I’m putting together a revised version that A) is better written and B) works well with current software – but I’m super waylaid at the moment by my graduate thesis.

      One thing you might want to check though – is there any data coming in from the serial port at all? Try using the arduino console, send it a ‘d’ character to trigger a frame dump. If data is not showing up there then you at least know there’s some kind of hardware problem.

      Good luck…


      • Hey

        Great project, thanks. Your driver was really helpful and saved me a lot of time

        I got this working in arduino 1.5 by changing lines 94 and 95 inside the switch case statement. I changed the Serial.println to Serial.write and removed where you cast the values to bytes.

        so i changed:

        Serial.print( (byte) frame[input] );
        Serial.print( (byte)127 );


        Serial.write( frame[input] );
        Serial.write(127 );

        and it all works now

      • Awesome! Thanks for this update. The serial library has changed some since I wrote this years ago.

  6. Hello,

    I love the post, and I am trying to do the same for some time, I even came across Martin The’s library also. I was giving it a go on a A5020E chip, and trying to read just the deltaX and deltaY values, found from a datasheet and all. The problem was that the values seemed kinda random and didn’t really respond well, so I went ahead and bought another cheap mouse to try my luck. Well for the new one I didn’t find a datasheet, but it looks like it’s pretty much the same kind of serial transmission stuff… What I wanted to do with it is read all (most) of the registers, and print them on a screen, to see what changes and when, maybe two of them will respond directly to the movement of the mouse and then I identify them. Unfortunately I am doing something wrong and the values read from the registers are crap… What do you suggest with this approach?

    Thanks, and keep up the good work!

  7. Hey,

    Your optical mouse project helped me with a a2620 optical mouse chip. The modified code can be found at my blog. I added reading of the X/Y movement registers, but did not have to make many changes to get your code working with the a2620. Thanks for this project, it got me up and running with the a2620 realy quickly.

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