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04/18/2304/18/23
Input-Output-Process Input-Output-Process DemoDemo
Automatic Streetlight SystemAutomatic Streetlight System
04/18/2304/18/23
ProcessorLight Sensor
Input Measurement
Light readingsLight readings
The monitoring of physical variables The monitoring of physical variables without the microprocessor taking without the microprocessor taking action.action.
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Processor
Compares current light level with Compares current light level with preset valuepreset value
Processing
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Processor
If current light level < preset valueIf current light level < preset value
Light OnSignalSignal
Night timeNight time
Processing Control When a microprocessor takes action When a microprocessor takes action depending on sensor readings.depending on sensor readings.
04/18/2304/18/23
Processor
If current light level > preset valueIf current light level > preset value
Light OffSignalSignal
DaytimeDaytime
Processing Control When a microprocessor takes action When a microprocessor takes action depending on sensor readings.depending on sensor readings.
Notes:Notes:Input:Input:
User sets the desired preset value.User sets the desired preset value. Sensors sending readings.Sensors sending readings.
Processing:Processing: Microprocessor comparing the preset value with the current Microprocessor comparing the preset value with the current
sensor readings.sensor readings. If higher / lower then microprocessor decides to switch a device If higher / lower then microprocessor decides to switch a device
on / off.on / off.
Output:Output: Devices actually being switched on or off.Devices actually being switched on or off.
Sensors Sensors do notdo not compare or decide to switch anything on compare or decide to switch anything on or off, they only send current readings.or off, they only send current readings.
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