This is my homemade Ball & Plate system. System consist of 2 digital servo motors (HS-422 ECO), microcontroller Arduino UNO, and 4 wire resistive touchscreen (7"). There are two PID controllers working separately for each axis. This system can move any ( heavier ) round element to any point of the surface to an accuracy of ± 2 mm .
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Step 1: Parts
Here is a short video that shows the parts of my real physical model
Step 2: Electronic Parts
1x Arduino UNO
1x Resistive touchscreen
1x Real time module DS1307
1x Wii nunchuck kit
1x IR remote kit
Step 3: Mechanical Design
The model was built from aluminum base and lego blocks . In the middle is Cardan Joint on two shafts. The plate of lego blocks is connected to servo motors wit "Ball & Socket" mechanical joints.