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Cactus High School - RPM 498
Electronics 101
Feedback
Open loop control
Desired value is input
Actual output is NOT measured
Variations in load may cause undesired output
Closed loop control
Desired value is input
Actual output is compared to the desired value
A new control value is output to compensate for the variation
Feedback example - Limit switches in robot arm
Without feedback
Arm breakage
Motor burnout
Drive system breakage
With feedback
No over drive damage
LEDs on OI indicate maximum movement
Residual damage could have been worse without feedback
Our tape guide pulled away from its mount.
The threaded holes in mount stripped out.
E-8
