Hi, after a long time I am updating my blog again. I bought few nokia color LCDs and resistive touchpad last month, all are chinese clones and very cheap. Then I thought of doing some thing with the touchpad at first. My previous blogpost was a TV remote based computer mouse. So I decided to make a similar stuff using the touchpad and bluetooth...
I have used a cheap ATtiny13 (8pins) microcontroller which runs at internal 9.6MHz clock. It samples two channel analog voltage from the touchpad. One of the GPIO pin is configured as a software uart TX (bit banging) which will stream the mouse data at a baudrate of 115200 to a PC via bluetooth (HC_05 bluetooth module). Apart from the mouse cursor movement, I have implemented left click, right click and wheels on the same touch screen.
A python script running on the pc will accept the mouse data and it will process the data and apply a smoothing filter to make the cursor movement more efficient. Right now I did the code for linux but will be easily portable by small modification in the python code.
The only demerit is that we cannot do any multi-touch since it is a resistive touchpad.... Also it is not so easy to use with naked finger, instead a stylus is recommended for smooth operation. But any way in the video demo you can see its working fine with my finger........(I am using my fingernail ;-) ).....
The bottom left part of the touchpad is configured as left click, bottom right as right click and 1 thickness from the right is for mouse wheel ...
https://github.com/vinodstanur/resistive_touchpad_as_wireless_mouse
Code:
Python code for PC:
I have used a cheap ATtiny13 (8pins) microcontroller which runs at internal 9.6MHz clock. It samples two channel analog voltage from the touchpad. One of the GPIO pin is configured as a software uart TX (bit banging) which will stream the mouse data at a baudrate of 115200 to a PC via bluetooth (HC_05 bluetooth module). Apart from the mouse cursor movement, I have implemented left click, right click and wheels on the same touch screen.
A python script running on the pc will accept the mouse data and it will process the data and apply a smoothing filter to make the cursor movement more efficient. Right now I did the code for linux but will be easily portable by small modification in the python code.
The only demerit is that we cannot do any multi-touch since it is a resistive touchpad.... Also it is not so easy to use with naked finger, instead a stylus is recommended for smooth operation. But any way in the video demo you can see its working fine with my finger........(I am using my fingernail ;-) ).....
The bottom left part of the touchpad is configured as left click, bottom right as right click and 1 thickness from the right is for mouse wheel ...
Circuit diagram:
Code:
Python code for PC:
Great!!! Thanks for sharing ;-)
ReplyDeleteHi, there. Thinking of creating a touchscreen project. Which touchscreen did you use, and how did you wire it? (they seem to often have tiny ZIF connectors)
ReplyDeleteCefn
http://shrimping.it
Thanks !!! it cool !!!
ReplyDeleteWhere you buy this touchpanel ?
Regards
It cool!!!!
ReplyDeleteLook my project
http://www.youtube.com/watch?feature=player_embedded&v=ATRV4r7DLD8
end post:
http://habrahabr.ru/post/136297/
I want to build devices 'Resistive touch' + 'teensy++' as HID USB Keyboard\Mouse, you can help me this project?
I can't compile the python code under windows , can you give me a compiled version (for windows) or correct the code? The error is on the 27th line.
ReplyDeleteRegards
nice work @ Green Goo... :-)
ReplyDelete@cece99: I think in 27th line there is some TAB problem. Correct it or download the code from my github repo/copy it from the gist embedded above...
Can this be easily converted to Wacom RF digitizer modules?
ReplyDeleteI suspect that a serial output is necessary for this to work. Correct?
Great project.
Thanks
Nitrous
Hello Vinod,
ReplyDeleteGreat work and more than that is its ingeniousness. I had never thought of using a touch panel to control mouse. I have seen your other projects as well, all of them are unique!! I tried the mouse commands on my computer (using python) and all of them works flawless..
Regards,
Debraj
Wow, thanks for sharing all this information , i wanna try to make this device at this moment, thanks a lot man.
ReplyDeletehow to install script in pc
ReplyDeleteand in device
This comment has been removed by the author.
ReplyDeletehello Vinod, i am impressed from your work. i am working on a project based on ATmega32 and touch screen. I am facing some problem in interfacing it. would you please help me? here is my thread
ReplyDeletehttp://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&p=1056287#1056287
Very cool device, interested in seeing more of it.
ReplyDelete- http://custompcstuff.blogspot.com/
Hello, thanks for your projects. But I newbie in AVR..I can't understand how you compile "C" code..Please answer, what program you compile, and can you send the *hex file to me
ReplyDelete