Raspberry Pi and Arduino are wonderful platforms to use to build robots and connected electronics and learn some coding in the process. The Drinkmotizer is a drink mixing robot powered by a Raspberry Pi. It uses a stepper motor to drive the table via a drive belt. An Arduino is used to receive the recipe from the Pi unit and control the movement.
More gadgets like this: here
Drinkmotizer -- the DIY drink mixing robot platform with Raspberry Pi and Arduino
Drinkmotizer 2 - Cinco de Mayo 2014 and St. Patrick's Day 2014
The developers used a Centipede shield to expand the I/O of the Arduino Uno. The entire project costs a bit over $1300 to complete but you may be able to find the parts for cheaper prices.
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