24-port GPIO on a PCI card


So you’ve got a project running on an x86 board and you’d like some GPIO pins. Whether you want to read a few buttons, light up a few LEDs, put an accelerometer in your computer or whatever, you’ve got a problem. Luckily there’s an easy way to get 24 GPIO pins on an x86 board using a PCI card for just a few bucks.

The key component of the build is a PCI TV Tuner card made by Hauppague under the WinTV brand. If you’ve got one of these cards with either a Brooktree bt848, bt849, bt878 or bt879 video capture chip, having 24 GPIO pins is just a spool of magnet wire, a soldering iron, and a steady hand away.

It’s a great build if you’d like some GPIO action without going through the usual parallel port mess, and especially useful since these WinTV capture cards can be had from the usual Internet suppliers for just a few bucks. You’ll need a driver, of course, but the relevant Linux kernel driver – bt8xxgpio – should be included any reasonably modern distro.

Special thanks to [Dex Hamilton] for notifying us of this build.


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