Ambient Feedback Control System Jonathan Uht

 Description of Ambient Feedback Control System  Block Diagram of Ambient Feedback Control System  Hardware Design  Software Design  Testing Methods  Further Work  Q/A

 Control a motor using feedback from ambient light levels sensed by the CdS photocell  If the ambient light level is higher than desired level, then decrease the speed of the motor  If the ambient light level is lower than desired level, then increase the speed of the motor  Simple feedback and Proportional Feedback will be demonstrated.

 Determine Switch Press ◦ Assign Commanded Light Level ◦ Light up the LED corresponding to switch ◦ Light LED on breadboard to commanded level of light  Measure Actual Ambient Light Level ◦ A/D Converter ◦ Determine Error ◦ Display Commanded Level, Actual Level, Error, and OCR2 values ◦ Use Error to set OCR2 to change speed of motor  If actual > commanded => decrease speed  If actual increase speed  If actual maximum shut off motor  Measure Speed of Motor ◦ Use NTE3100 to measure actual speed of Motor  Use timer interrupt  Use input capture ◦ Display Speed to Terminal

 The methods of feedback will be simple and proportional  Verify that the speed of the motor changes proportionally to the error in light levels  Verify that if the light level exceeds the boundaries, the motor shuts off  Verify the LED emits the correct level of light from the appropriate switch

 Experimenting with multiple types of feedback ◦ Proportional (Will be implemented) ◦ Integral (Time dependent) ◦ Differential (Time dependent)