Here is a kit that lets you use your Android smartphone as a multi-purpose shield for Arduino. 1Sheeld can be used as input or output device, allowing you to control your RC car and do a whole lot more. You get over 40 Arduino shields on your device.
The gadget is compatible with Arduino UNO, MEGA, and Due. It has a range of 30 feet. These videos show what you can do with it.
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