Input and output
For the system to work there is an input and an output. The process is taking the input and doing something with it - modifying it in some way - and producing an output.
In a computer system the processing will be done by a microprocessor of some kind.
Feedback is the output fed back to the input. The cruise control flowchart is an example of negative feedback because the speed is always kept at the same value. Positive feedback would push the speed away from the desired value.
Examples of inputs
- keyboard
- mouse
- microphone
- scanner
- camera
- pressure sensor
- temperature sensor
- magnetic sensor
- moisture sensor
- light sensor
Examples of outputs
- printers
- speakers
- motors
- monitors
- heaters
- electromagnets
- bulbs/LEDs
For another example of feedback view the computer-controlled greenhouse in the computer control revision bite.
Now try a Test Bite
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