1. Input-Output-Process Demo
Traffic Flow Counting System
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2. Weight of a small car programmed in.
Input
Processor
Preset Value:
Weight of a small car programmed in.
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3. Input Measurement Processor
The monitoring of physical variables without the microprocessor taking action.
Weight readings
Weight Sensor
Processor
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4. Compares detected weight with preset value
Processor
Compares detected weight with preset value
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5. If weight level < preset value
Processor
If weight level < preset value
then it isn’t a car
Do nothing
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6. Processing Control Processor
When a microprocessor takes action depending on sensor readings.
Processing Control
Processor
If weight level > preset value
then it is probably a car.
Increment counter and count another car.
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7. The process is continuous and so repeats.
Output
Increment counter and count another car.
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The process is continuous and so repeats.

8. Notes: Input: Processing: Output:
User sets the desired preset value.
Sensors sending readings.
Processing:
Microprocessor comparing the preset value with the current sensor readings.
If higher / lower then microprocessor decides to switch a device on / off.
Output:
Devices actually being switched on or off.
Sensors do not compare or decide to switch anything on or off, they only send current readings.
15/02/2019