Linear Motion Bearing LM12UU (12mm Dia) mks and a hall-effect sensor

and a hall-effect sensor

Depending on how you interpret the data

Speed control PWM frequency up to 10KHz

LSM303DLHC sensor IC datasheet

eliminating the need for an external power supply

Linear Motion Bearing LM12UU (12mm Dia) mks and a hall-effect sensorLinear bearings are used for linear motion. They can be used to build low cost and simple linear guiding systems for a wide variety of applications such as CNC and 3d printers. This linear ball bearing slides along an 12mm linear shaft. Specifications 30mm long x 21mm outer diameter x 12mm inner diameter Dynamic load rating C(N): 510 N Static load rating Co(N): 784 N 4 Ball races inside 2 grooves with 20 mm outer diameter