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SparkFun engineers do play with what they sell. Ryan an engineer at SparkFun made use of PSP touch screen and AVR ATMega168 to construct this USB Touchscreen mouse.
The PSP touchscreen is a 4 wire analog resistive touchscreen. This means by touching the screen at one point, a resistance between each edge is formed for both the x and y axises.By applying a voltage across each axis, a changing resistance results in a changing voltage. Thus a simple ADC on a microcontroller can be used to find x and y positions. You can get more information on How USB screen works in this document here.
The ATMega168 is loaded with open source V-USB stack which turns any AVR into a USB device along with that HID profile enables it to work as a USB mouse. The only requirement is that the D+ pin needs to be connected to the INT0 pin.
Nisar Bhai P Uyemera ki zarrorat hai link hai to bhejiye
Anonymous | 05 Sep : 08:46
any suggestion abt the lcd in 4 bit mode written bottom can be mailed to suji.90@gmail.com
lcd in 4 bit mode | 05 Sep : 08:44
i have only 4 bits of p2 available,the upper nibble is already in use.so,how should i write #define lcd_data ------ i can't write like 1/2(p2) or #define lcd_port P2.because this may disturb the application running on p2.4,p2.5,p2.6,p2.7 please anyone give me a suggestion
Anonymous | 05 Sep : 06:47
hi..i want to know whether active and passive rfid have same protocols or what?
Hi everyone. I am doing project interfacing keypad with microcontroler
i am trying with 3x4 matrix keyboard &16*2 lcd. I googled two days gone through many codes but unable to make it. Even gone through tutorial on this ite also, http://www.8051projects.net/keypad-interfacing/8051-programming.php Still i din get proper complete program. I knew its not nice to ask complete code from others. Since i am getting confused to catch the concept, can somebody give me basic assembly code to If u upload the schematic of the code will help me better to mingle with proteus, If does not have i will make it. After all i just need basic code & full information of project.. If u really want myself to design, please guide me some procedures or tips. Because for the past two days i am trying hard but end up with somewhere else.
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