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Input-Output-Process Input-Output-Process DemoDemo

Automatic Streetlight SystemAutomatic Streetlight System

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Preset Value:Dark light level programmed in.

Processor

Input

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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.

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Light On

Night timeNight time

Output

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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.

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Light Off

Output

The process is continuous and so repeats.

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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