USB Controller

[LeoB]

Hello all,
I'm an happy user of the LIME boards and I usually connect some switches directly to the GPIOS controlling some software actions with physical buttons connected to the board.

Now I would like to create a separate board with the switches in order to separate the board with the software and the controller board and if possible I would like to connect the two boards via usb.
Could you please guide me on the best solution to achieve this goal?

Thank you!

[LubOlimex]

There is some more software effort if you decide to connect the two boards over USB. Consider creating your board of peripherals with well-supported USB chip (or placing a popular converter).

Instead of USB consider using I2C or SPI. For reference check how we design our extension boards, like MOD-IO - it has AVR chip with firmware and connects to other boards via I2C: https://www.olimex.com/Products/Modules/IO/MOD-IO/open-source-hardware

[LeoB]

Thanks a lot for your reply!
I was thinking to USB because it will be really great if I can connect the board with the switches to a PC or the lime board but googling I'm not finding anything useful to understand how can I create this kind of interface.
Do you have a guide or an idea?

Thanks again!