How to find pinout for Touchpad/Pointing Stick & connect to Arduino - Synaptics 

thanks, this is what I needed T22 - 5V T23 - GND T10 - CLOCK T11 - DATA

thanks a lot, this video give me a BIG help. i have a touchpad that i don't know the model, but with this method i found vcc gnd Data and CLK !

You are absolutely right about the pins, the same for every synaptics device. Just rescued two pads with different modelnumbers (TM214 and TM41P) and works fine! Many thanks, thumbs up for the perfect guide.

Amazing. Now I've just got to figure this out with an unlabeled Elan trackpad

Thanks for this video its really great. Just have a quick question. How can I know if my touchpad needs a 3.3V or 5V?

Thanks dude. So glad I stumbled into link to this video. I've been planning to create fairly small tabletop arcade. I've been thinking to add trackball for ie. ScummVM games, but I think I now might try to implement one old HP trackpoint controller to add mouse functionality in small space. This will 100% go into consideration. Thanks for the vid 👍👍

Thank you so much for this video, very informative, showed me almost everything I would want to know. I found this because I had the exact same part, and was trying to look at it with my newly bought logic analyzer. I put 22 to +5V and 23 to ground, and pulled up 10 and 11 with 6.8K resistors, and tried looking at the data on CLK and DATA. For some reason, it could even be a soldering mistake, although I've checked everything multiple times, both of these signals read the same, and they both look like data packets. Are you sure that 10 is actually CLK? I have seen someone on hackaday saying that you can actually read PS/2 without reading the CLK signal.

Thanksss.... This video is very informative and it helped me a lot....

This was great, useful information. I had a broken Creative Zen Micro with a vertical touchpad by Synaptics, too bad I threw it away. I wonder if the iPod touchwheels have similiar pins. Thanks!

just connect the oscilloscope probe and read the sequence. you can see which one us clk/dat .

FOR FUTURE REF: /* * an arduino sketch to interface with a ps/2 mouse. * Also uses serial protocol to talk back to the host * and report what it finds. */ /* * Pin 5 is the mouse data pin, pin 6 is the clock pin * Feel free to use whatever pins are convenient. */ #define MDATA 5 #define MCLK 6 /* * according to some code I saw, these functions will * correctly set the mouse clock and data pins for * various conditions. */ void gohi(int pin) { pinMode(pin, INPUT); digitalWrite(pin, HIGH); } void golo(int pin) { pinMode(pin, OUTPUT); digitalWrite(pin, LOW); } void mouse_write(char data) { char i; char parity = 1; // Serial.print("Sending "); // Serial.print(data, HEX); // Serial.print(" to mouse "); // Serial.print("RTS"); /* put pins in output mode */ gohi(MDATA); gohi(MCLK); delayMicroseconds(300); golo(MCLK); delayMicroseconds(300); golo(MDATA); delayMicroseconds(10); /* start bit */ gohi(MCLK); /* wait for mouse to take control of clock); */ while (digitalRead(MCLK) == HIGH) ; /* clock is low, and we are clear to send data */ for (i=0; i < 8; i++) { if (data & 0x01) { gohi(MDATA); } else { golo(MDATA); } /* wait for clock cycle */ while (digitalRead(MCLK) == LOW) ; while (digitalRead(MCLK) == HIGH) ; parity = parity ^ (data & 0x01); data = data >> 1; } /* parity */ if (parity) { gohi(MDATA); } else { golo(MDATA); } while (digitalRead(MCLK) == LOW) ; while (digitalRead(MCLK) == HIGH) ; /* stop bit */ gohi(MDATA); delayMicroseconds(50); while (digitalRead(MCLK) == HIGH) ; /* wait for mouse to switch modes */ while ((digitalRead(MCLK) == LOW) || (digitalRead(MDATA) == LOW)) ; /* put a hold on the incoming data. */ golo(MCLK); // Serial.print("done. "); } /* * Get a byte of data from the mouse */ char mouse_read(void) { char data = 0x00; int i; char bit = 0x01; // Serial.print("reading byte from mouse "); /* start the clock */ gohi(MCLK); gohi(MDATA); delayMicroseconds(50); while (digitalRead(MCLK) == HIGH) ; delayMicroseconds(5); /* not sure why */ while (digitalRead(MCLK) == LOW) /* eat start bit */ ; for (i=0; i < 8; i++) { while (digitalRead(MCLK) == HIGH) ; if (digitalRead(MDATA) == HIGH) { data = data | bit; } while (digitalRead(MCLK) == LOW) ; bit = bit

Good Normal Speaking video. No stupid music. Guess what? I GAVE A LIKE !

thank you thaank you

Great video, thank you!

keyboard itself is a key matrix, same like for Arduino. So it can be added to arduino as well.

Very helpful video. Thanks.

I've got a laptop that has touch pad and pointer stick not working from the very start at windows 7 and 10 install. It's enabled with fn key, So I'm expecting it's not an actual fault with those devices but fault with motherboard. Where does the data go to? Is it the super io chip? Southbridge? Cpu? Perhaps a broken track leading there? What do you think? A USB mouse works. Surely a broken track leading to other motherboard circuitry right? Z30 toshiba.

can you please help me..... from where can i get the whole code used here

Very useful, thanks.

Great tutorial! I have a Synaptics PS/2 touchpad from a Samsung QX411 laptop. I found schematics that show that the chip to be working on 3.3v. As you said T22 seems to be power, but there is also T16 which has 14.7ohm resistance with T22. Do you have an idea what it could be for? Maybe one is for 5v and the other for 3.3v? Thanks a lot!

thank you so much brother... helped a lot.. u earned a like and a sub :-)

My touchpad doesn't seem to have a T22 pin. What other pinss could be used as the T22 pin? I have T23 T11, and T10 on my touchpad, but the only needed pin I'm missing is T22. The other things I have is T21, T9, and T2 pins.

I want to mod a desktop keyboard with this, is there a way to make it work with usb and not ps/2? Or will you need a ps/2 to usb converter, in that case I guess I can grab and old ps/2 cable and connect it to the pc like that. I'll be using an old keyboard from lenovo thinkpad.

I would like to buy one module of this trackpoint but i cant seem to find one the internet. Where did you buy it?

I can't find the ground, cuz theres no metal part exposed

Great

can you please provide your code?

Bro which bord are you usin is it aedieno uno bord

hey! i want to know if i can use raspberry pi instead of arduino/

hello ihave a problem whit it in esp8266

How do you do this without an aurduino?

How can i contact you

Require a better video on the actual installation of the code, libraries and then running it.

make it move