Daniel, Pankaj, Thank you both for your answers. Yes, it seems that we will have to stick to using the USB Host on the Android device.
It seems there are a couple of phones supporting USB Host as well (Samsung Galaxy S2 and HTC Desire HD). Maybe more will come out. If they have Android 4.0 they should. Best regards, Alex On Jan 17, 7:30 am, Pankaj Chawla <[email protected]> wrote: > Hi Alex, > > I am not an expert here but starting 3.1 onwards android devices can act > as USB host. So essentially your device can act as the USB device and > can also get powered from the Android phone/tablet. This though has > implications on battery of your android device but in case your USB > device just needs to be connected for small durations, this would be > a perfect path to follow. > > Cheers > Pankaj > > > > > > > > On Fri, Jan 13, 2012 at 8:45 PM, Alex O. <[email protected]> wrote: > > Hello, > > > Let me rephrase my question. If I understand this correctly, an > > accessory must have its own power source and, moreover, should also > > provide power to the phone (500mA at 5V for charging power). > > > In this case, it seems that the accesories can only be bulky devices > > (such as the Arduino board in ADK) with charging cables and no form > > factor constraints. Or, perhaps, augmentations to extra-battery packs. > > > 1) Is this the scope of the Open Accessory, or am I missing the point? > > 2) Is there any way that, at least, the accessory should provide its > > own power, but not have to power the phone as well? > > > Best regards, > > Alex > > > On Jan 8, 10:27 am, "Alex O." <[email protected]> wrote: > > > Hi all, > > > > We are interested in developing an USB dongle for Android devices. We > > > consider implementing the Open Accessory protocol for the dongle, so > > > it would work with both tablets and phones, without changes in the > > > kernel for the Android device. > > > > However, if I understand this correctly, the dongle would need to have > > > its own power source and provide 500mA at 5V for charging power. Is > > > there any way to make this dongle without its own power source? > > > > Thank you,Alex > > > -- > > You received this message because you are subscribed to the Google > > Groups "Android Developers" group. > > To post to this group, send email to [email protected] > > To unsubscribe from this group, send email to > > [email protected] > > For more options, visit this group at > >http://groups.google.com/group/android-developers?hl=en -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
