1. MOTORS

2.  Need a Motor That is Capable of Moving the Mirrors to a Fairly Precise Angle

3.  DC Motor  Servo Motor (DC)  Stepper  AC Motor

4. Price Range  $1.50 Thru -- Ease of Interface  Need an Encoder or Potentiometer to Ensure Correct Angle  An H-Bridge is Needed to Run This

5. Price Range  $10 Thru -- Performance  Low Torque = Low Current = Efficient  Fairly Precise Angle Choice Ease of Interface  Do Not Need an Encoder or Potentiometer to Ensure Correct Angle. Pulse Width Determines Angle (All Inclusive)  Need PWM

6. Price Range  $20 Thru -- Performance  Very Precise Angles, Must be Monitored Externally (Unless Intelligent Stepper Used)  Very Low Torque Ease of Interface  Similar to Servo, If Encoder or Potentiometer Used  Requires Building or Buying a Motor Driver That “Knows” What Angle It Is At

7. Price Range  $20 Thru -- Performance  Usually Large and Heavy  Last A Very Long Time  Generally Made For One Speed Ease of Interface  Encoder or Potentiometer Required  Requires Building or Buying a Variable Frequency Controller (Not as common)

8.  Torque  Precision  Ease of Controlling  Price/Performance

9. MotorTorque.5 Precision 1.0 Controlling 2.0 Price 2.0 Overall Rating Stepper152.5 2.9 DC5542.53.7 Servo54.552.03.8 AC5532.03.2 1-5 RatingsEach Property Weighting is Listed Below it

10. Motor Choice DC Servo Motor Reasons  Simplicity (Already a “Smart” Device)  More Than Enough Torque  Small Sized and Only Three Wires (Saves Space)  Initially More Expensive But Do Not Need Additional Sensors