Thanks! All the solutions out there seemed very pricey for what seems like really simple hardware and fairly simple software. So decided to give it a shot. Turned out pretty well and in testing so far seems reliable and useful.
I only hope others find it useful and build one as well. The hardware itself, once all the parts are on hand, takes only an hour or so. Software took longer, but now everyone has that with 0 time investment. All parts cost me ~$150.