few questions about USB device

[Kz9]

Hello everyone,

I want to desgin a device that communicates with the computer via the USB port. more like a "hello world" project.

I know I need a microcontroller; but is it any microcontroller that just need some code written to it, or it must has a USB interface?

And about the D+ and D- data wires in the USB, which one carries data to the device and which to the computer?

Thanks in advance.
Kz9

 

[srizbf]

you must have an usb interface for the microcntroller.

some controllers have them built-in and some requires externally to be connected.

the D+ and D- lines are data lines .
they carry the data , whether its from or to the PC.


srizbf
5thjune2010

 

[Kz9]

thanks, srizbf.

can you please recommend a microcontroller that has the usb feature.

Kz9

 

[numa]

Many Microchip PIC devices has built in USB peripheral. One PIC micro controller that I used recently is PIC18F14K50. This is a low cost controller that supports USB. You can download Microchip USB stack and sample firmware for free from https://www.microchip.com/usb. It took less than 30 minutes for me to get my "Hello world" application up running.

 

[georgz]

You can see the specs of every microcontroller at the manufacturer site, just read the datasheets! One pic i used few days ago was 18F2550.

 

[Kz9]

thanks for the replies