Electronic Design

Set DC-Motor Speed with Light-Controlled Microcontroller Circuit (.PDF Download)

This 8051 microcontroller-based control circuit adjusts the speed of a small permanent-magnet dc motor via photosensors (see the figure). The circuit can find applications in light-tracking systems for adjusting tracking-motor speed depending on the intensity of the incident light. It can also be modified to control more than one motor at the same time...

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