[Frank Herrmann] had an interesting idea to turn a geared DC motor into a servo motor assembly ... up to the motion controller upstream. The Arduino source for this can be found on the project ...

a beginner-friendly collection of electronics projects using the low-cost Arduino board. Servos are small motors that can precisely angle their arms to positions between 0 and 180 degrees.

This solar tracker system uses the Arduino UNO board, a servomotor, 2 LDRs and 2 resistors to rotate the solar panel towards the Sun or a source of light. Here https ...

My CNC is built from 2 DC servo motors for X ... because this voltage level is compatible with L293D Motor Arduino Shield. If you want to use a 24VDC power supply, the motor control module ...