Re: Monitor three or more footswitches over RS-232

Thanks for your suggestions.
I like the suggestion of hacking a serial mouse - at least for a
one-off solution. But once I've got a workable solution, I need to make
a few of these.
So I need a cheap solution that is easily reproducible.

Wiring the switches directly to the control lines is an idea, but
implies that my software on the PDA will have to poll the interface to
determine if a switch is shut. This would be disastrous for battery
life so is not possible.

Which leaves a UART. I haven't worked with these before - can this be
done for a few $$s, and would I need some kind of RS232 interface chip
between the UART and the 9-pin socket?

.