I would like to investigate the possibility of using an Arduino device to develop a cable which uses the headphone jack of an android device as an input, converts to digital and outputs to the device again via usb link.
Is Arduino the right way to go about this? If so any pointers to similar projects would be of great help.
I am currently developing android apps and have previously worked as a embedded engineer, however I feel I am a bit out of the loop on android accessory dev.
thanks for any help, it will be greatly appreciated.
The triggertrap shutter release (http://www.triggertrap.com) uses the phone jack for their Android and IOS products. They discovered that they had to re-engineer the dongle that sits in the 3.5mm jack and connects to the camera specific 2.5mm cable because phones sold in the European union had limits on the amount of current that can go out of the headphone jack. They also discovered that there is a delay between the app sending out the sound and it coming out of the headphone jack that was affecting using it for high speed photography (like lightning). I don't recall the details, but if you go back in their blog, it should give more details (or ask the developers).