We used "Bluetooth Terminal" Android App from NEXT PROTOTYPES. Commands were sent to the Arduino using a Bluetooth connection. For making it easy to control the slider we defined four buttons "Forward", "Backward", "Speed" and "Distance". Functions of these buttons are as following:1. "Forward" move slider forward2. "Backward" move slider backward3. "Speed" adjusting slider motion speed (between 0.3 mm/s up to 37 mm/s)4. "Distance" adjusting slider motion distance (9 to 81 cm)Buttons "Forward", "Backward", "Speed" and "Distance" are defined in 'Button Preferences' section in setting of the app, they will send 'F', 'B', 'S' and 'D' to the Arduino respectively. For adjusting speed and distance you should just send a number between 1 to 9 from app.