Connect AVR to a USB device

[Deth20]

Hi!

Does anyone know if it's possible to establish a communication between a AVR and a USB-device. For example a keyboard and a atmega8 with lcd?
Or what I want to do: Connect a usb-bluetooth-module and a AVR.


Any protips?

[adafruit]

pretty much impossible, you would need a usb host chip for such a thing

[Hazard]

There are a few AVR that can host USB devices.
Check this one http://www.atmel.com/dyn/products/produ ... rt_id=3876

[mtbf0]

ftdi makes a usb host controller that can talk to an avr via spi or uart. of course, these things are programmable so you may not need the avr.

[adafruit]

im pretty sure the at90's are usb clients not hosts
the ftdi chips, in theory, could do it...but they're still very new and aparently buggy. theres a low cost devboard pluggy available tho

[mtbf0]

im pretty sure the at90's are usb clients not hosts

the at90usb1287 and at90usb647 will do client host and otg.

[mattkenny]

establish a communication between a AVR and a USB-device. For example a keyboard and a atmega8 with lcd?

If you put the little USB->PS/2 connector on the end of the keyboard, you should be able to decode the PS/2 signals from the keyboard. I haven't done it myself, but I know people have without much difficulty (and there are libraries for it too). That removes the whole ugly USB-Host problem.

Or what I want to do: Connect a usb-bluetooth-module and a AVR.

If you want bluetooth connectivity from an AVR, check out these from sparkfun: http://www.sparkfun.com/commerce/categories.php?c=115 (is it ok to post this link?)

Depending on what module you use, you should be able to get a bluetooth connection to your PC (as a virtual comm-port), or with 2 modules you can get a bluetooth connection between two circuits (both using serial comms over bluetooth). Again, never used 'em, but always wanted to (never had a need unfortunately).