App note: NXP Smartphone Quick-Jack Solution

Posted on Sunday, June 22nd, 2014 in app notes by DP


An interesting app note (PDF) from NXP where you can interface your mobile phone with a microcontroller via the audio 3.5mm jack.

Inspired by the University of Michigan’s Project HiJack, the NXP Smartphone Quick-Jack Solution repurposes the standard 3.5mm stereo audio jack found on most smartphones into a self-powered data channel that makes communication with these smartphones as easy as plugging a headset jack into the audio port.
The Quick-Jack demo board integrates a joystick, temperature sensor, LEDs and an expansion header. The app running on the smartphone is able to interface with these on-board peripherals via the Quick-Jack interface.

This entry was posted on Sunday, June 22nd, 2014 at 5:00 pm and is filed under app notes. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

2 Responses to “App note: NXP Smartphone Quick-Jack Solution”

  1. Cyk says:

    And all of this hassle only because the major smartphone manufacturers are too dumb to agree on a common docking interface…

    • KH says:

      If you look closely at the diagram, it has nothing to do with docking interfaces at all…

      I’m sure smartphone manufacturers are not dumb. Pretty sure they’ve studied their consumer psychology stuff. Turn everything into compatible commodity parts? Just like the PC business, how’s it doing now? Of course not.

Leave a Reply

Notify me of followup comments via e-mail. You can also subscribe without commenting.

Recent Comments

  • readybrek: Anyone got a any recommendations for a budget-priced hot air station?
  • William: lol I'm happy to waste 3c for each program/debug cycle... but probably not the time spent soldering a new device down to a proto board!...
  • Joe Desbonnet: Ya, I can recommend the low melting point solder. I used brand 'ChipQuik' and it's amazingly easy to use.
  • Jerome: I need a new BusPirate for the Fablab ;) Many thanks!
  • Max: Seems like an unexpectedly violent way to remove the chip indeed. A hot air station should of course do the job just fine, but in...