In SX Microcontrollers, SX/B Compiler and SX-Key Tool, maxwin wrote:

Dave,

On the google/parallax site/etc... travels, I have come across many examples of projects using a usb interface to the SX, instead/as well as rs232. For example:
http://www.parallax.com/Portals/0/Downloads/docs/prod/boards/BOE_USB_D_Schematic.pdf

It would seem no problem.

The MAX7300 chip you mention looks like it should be useful for something in the future, so I am glad you mentioned it here  :smile: 

Although if I am reading the datasheet correctly, it will only source 4.5ma / sink 10ma per IO. And you may also need to consider the maximum total capabilities, which may be less than the 28 IO's X 10ma; it might be an issue if you need to switch all relays on at once. Anyhow, you might struggle to find a relay (perhaps a reed relay might) that you can directly connect, so you might need an additional bank of uln2803a's or such.

Goodluck.

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