Speed control of single phase shaded pole induction motor
&gt; NOTE: No microcontrollers may be used
Define &quot;microcontroller&quot;? If you were to get a small SSR that provided phase angle firing from an analog input signal, is the IC inside of the SSR that controls the firing angle going to be considered a &quot;microcontroller&quot;? Because that would be the simplest way to do this. Analog signal to SSR controls the phase angle firing of the SSR to control the output voltage, SSR is then controlling the torque (and thus speed) of the SP motor. Note that I am being specific about phase angle control, because not all SSRs do this, you have to specifically look for that feature when using it for a motor.
And ignore the comment about not being able to change speed on an AC motor with voltage only, that is true for most AC induction motors, but not ALL types and Shaded Pole motors ARE one of the types that can be controlled this way.