1. Input-Output-Process Demo
Burglar Alarm System
19/02/2019

2. Possible Sensors Light Sensors Sound Sensors Motion Sensors
Temperature Sensors
and many more ….
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3. The average temperature of a human programmed into the processor.
Input
Processor
Preset Value:
The average temperature of a human programmed into the processor.
19/02/2019

4. Input Measurement Processor
The monitoring of physical variables without the microprocessor taking action.
Temperature readings
Temperature Sensor
Processor
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5. Compares current temperature with preset value
Processing
Processor
Compares current temperature with preset value
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6. If current temperature > preset value
When a microprocessor takes action depending on sensor readings.
Processing Control
Signal
Alarm On
Processor
If current temperature > preset value
Burglar detected
Call Police
Signal
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7. Output
Alarm On
Call Police
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8. The process is continuous and so repeats.
Output
Processor
If current temperature < preset value
Do nothing
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The process is continuous and so repeats.

9. Notes: Input: Processing: Output:
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.
19/02/2019