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Advice Request: Linux Control Of Digital IO

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Simple problem - I need to control a digital IO from Linux - preferably using an USB interface.

I was going to use a MSP430 Launch pad, but the CDC serial support with Linux is not reliable. I am planning on using a TI RF2500 with the built-in application UART next but it is a little pricey ~$50.00.

The goal is to control a digital relay which will in turn be used to power cycle an unreliable piece of low-voltage equipment.

I need nothing more than to be able to assert an IO, wait for a bit, and then send a character back to the host application.

I'd appreciate any pointers to low-cost, readily available solutions. I'm in Canada, so things I can get from Digikey would get preference.

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