Latest in Apple

Image credit:

iPhone headset socket hijacked to power DIY peripherals (video)

Sean Hollister
01.17.11
86 Shares
Share
Tweet
Share
Save

Sponsored Links

Apple's proprietary dock connector may keep would-be peripheral manufacturers at bay, but if you want to build your own iOS companion devices, there's another way. You might have noticed that the Square credit card reader uses Apple's 3.5mm headset jack to transmit power and data at once, and gadgeteers at the University of Michigan are busy open-sourcing the same technique for all the DIY contraptions you can dream of. Project HiJack has already figured out how to pull 7.4 milliwatts out of a 22kHz audio tone, and built a series of prototype boards (including working EKG, temperature, humidity and motion sensors) that transmit data to and from an iOS app at up to 8.82 kbaud -- using just $2.34 worth of electronic components. See the basic principles at work in the video above, and -- as soon as the team updates Google Code -- find out how to build your own at the links below.

All products recommended by Engadget are selected by our editorial team, independent of our parent company. Some of our stories include affiliate links. If you buy something through one of these links, we may earn an affiliate commission.
Share
86 Shares
Share
Tweet
Share
Save

Popular on Engadget

Engadget's Guide to Privacy

Engadget's Guide to Privacy

View
Disney+ public pre-orders are open, but without deep bundle discounts

Disney+ public pre-orders are open, but without deep bundle discounts

View
Facebook's Libra currency will get half its backing from the US dollar

Facebook's Libra currency will get half its backing from the US dollar

View
AMD delays 16-core Ryzen 9 CPU to November

AMD delays 16-core Ryzen 9 CPU to November

View
Erica's modular synth helps you make music with preset cards

Erica's modular synth helps you make music with preset cards

View

From around the web

Page 1Page 1ear iconeye iconFill 23text filevr