In this 7 minute video we explore “The mysteries of Apple device charging“. Usually device makers need to sign a confidentially agreement with Apple who want to say “works with iPhone / iPod” and never talk about how the insides work. If you don’t put these secret resistors on the data lines to you get the dreaded “CHARGING IS NOT SUPPORTED WITH THIS ACCESSORY”. We demonstrate how anyone can do this and make their own chargers that work with iPhone 4, 3Gs, etc. Video above, HD and (m4v).
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.
Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !
What stops Griffin (or some other gigantic producer of iPhone/iPod accessories) from just reverse engineering this stuff and not paying Apple for the right to sell chargers?
What prevents Apple from suing you for selling a minty boost plus after you reverse engineered what’s going on inside?
I don’t think what you’ve done is wrong, but why does Griffin pay Apple if it’s so easy to get it working?
I just caught this video alongside my morning coffee.
Great article, very interesting and a good example of rudimentary reverse engineering principles.
Made me wonder about my own phone, an HTC HD2. I think that I will be trying it out over the next few days. I am guessing that a more common arrangement for chargers will be to add voltages to the D lines for a mains or car charger and leave them off for a USB charge.
Only one way to find out….
Very interesting. I think other devices have their own secret resistor values as well; my Samsung phone complains when attaching it to the iPod charger wall-wart (fortunately, it still charges).
Your USB squid cable looks wonderful, but I wish it included a mini-USB to micro-USB adapter. Most all modern phones use micro-USB for charging (Apple being the exception).
@john – apple can sue anyone for anything if they wanted, but reverse engineering how something works is usually not one of them.
Thanks for the info! I followed this advice and changed one of the resistors on my MintyBuck circuit to limit its output current to 500ma also, since that’s as much as my little LM2674 “simple switcher” regulator is rated for.