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Pressy - any good for the Raspberry Pi?

Posted: Sat Aug 31, 2013 12:02 pm
by milhouse
Pressy is a Kickstarter project and is basically a button which fits in a headphone socket and, with suitable software, allows the user to initiate tasks with single or double short or long clicks.

Just thinking aloud, could this be useful when used with the Raspberry Pi? Does the Pi headphone socket have all the necessary contacts? It would work with all cases, which would be quite handy.

Could it be a reset switch? Take a photo with the camera? An Off (mostly off) switch? Stop/start some application? Turn on/off WiFi?

What other functionality is the headphone socket capable of?

Re: Pressy - any good for the Raspberry Pi?

Posted: Sat Aug 31, 2013 12:40 pm
by mahjongg
the PI's analog audio output isn't a "headset output", for the simple reason alone that it hasn't the drive capability to drive a headset directly! It is also wholly incompatible with the "headset output" as standardized on PC sound systems, it has no insertion detection (the feature that is used by pressy).
Also, with an abundance of GPIO pins why would anybody have any use for such a contraption as pressy (except for the fact that to use it you don't have to open the case, but you could simply wire up your own 3.5mm jack + a 2k2 pull-up to 3v3 if you want to duplicate the functionality of pressy).

so the simple answer is no, its no good for the Raspberry PI.

Re: Pressy - any good for the Raspberry Pi?

Posted: Sat Aug 31, 2013 12:48 pm
by milhouse
mahjongg wrote:Also, with an abundance of GPIO pins why would anybody have any use for such a contraption as pressy (except for the fact that to use it you don't have to open the case, but you could simply wire up your own 3.5mm jack + a 2k2 pull-up to 3v3 if you want to duplicate the functionality of pressy).
Why? Cases, mainly. To fit a button or switch securely you've got to drill a hole somewhere, and then wire up the GPIO pins, which is just more hassle and ultimately less attractive than something as simple as the Pressy.

The simplicity and potential universality of the Pressy was its obvious appeal, although it doesn't really surprise me the Pi headphone socket lacks the necessary contacts.
mahjongg wrote:so the simple answer is no, its no good for the Raspberry PI.
OK thanks.