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After some delays in sourcing components and setting up a good test procedure, we now have the PhoneDrone Android/RC interface board in production and available for purchase ($99). 

If you've been wanting to experiment with connecting Android phones or tablets to the world of RC vehicles, this is the board for you. It's the only Android ADK board on the market designed to work with RC equipment, and it can interface with APM (1 or 2) via serial, too.

From the product listing: 

"The board has 8 channels of RC in and out, with PWM-to-PPM conversion and multiplexing between RC and Android control. You just plug the Android's phone USB connector into the board and you have two-way communications with RC gear and any other board, such as APM.

 That means that you can switch between RC control and Android control or mix the two. An example would be "fly/drive by wire". You steer your vehicle via RC, but an Android phone does the actual control using its onboard IMU. On a car, that would allow every turn to be a high-speed controlled drift, for instance (we may show something like that at Maker Faire).

Or, with a UAV, you might have the Android phone doing high-level image processing and object tracking, sending mission commands to an autopilot board such as APM. You might also want to use the phone's long-distance wireless instead of an Xbee for two-way telemetry.

 This can either replace APM if you've got equivalent code running on Android, or compliment it with the Android device doing image processing or long-distance wireless comms.

SPECIFICATIONS:

• 8 Input&output PWMs
• Native USB host master (MAX3421)
• Native USB slave (Atmega32-au)
• Arduino Compatible
• Atmega2560 as main controller
• Atmega32-u2 as FTDI substitute and PPM encoder
• Three spare serial ports to communicate with other boards (including APM)
• Build-in 5V-2A switched power regulator (input range 6V - 36V)
• Build-in 3.3V LDO power regulator 
• Android TM compatible... 
• All Atmega2560 pins exposed.
• High quality PCB is ROHS/lead free, Gold immersed. 
• Dimensions: 4" x 1.6"...