I have a group project where I have to control the speed of a single-phase shaded pole induction motor. My plan was to use a Triac-based circuit however, all Triac circuits I have seen use a potentiometer to control the speed of the motor. In this project, the motor's speed is dependent on an external analog signal received from another unit. The 3 signals can either be high, medium, or low. How can that external analog signal be received and used to drive the motor at the specific high, medium, or low?
NOTE: No microcontrollers may be used
NOTE: No microcontrollers may be used