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Analogue to digital converters, sensors, control & monitoring

What is computer control?
Computer control means is using a computer to control the action or movement of an object.
This is often not done by a `computer' such as a desktop PC or laptop, it is often a processor or microchip.…

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Most control systems carry on working continuously, they don't just stop after one decision has been made.
Take the example of the greenhouse system:
1. The sensor takes a reading of 23 degrees and sends it to the computer. The computer processes this and
sends a signal to the heating…

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Computer controlled lighting systems at discos and concerts
Advantages of computer controlled systems:
Can operate 24 hours a day without taking a break.
Can work without holidays or sick days
Will work without any wages.
Will repeat actions over and over and over again
Can process data from sensors very…

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Special software (data logging software) takes the data and analyses it
The results of the analysis are presented as graphs and tables
The results are printed out
Advantages of computer data logging:
Data Logging can be used in remote or dangerous situations
Data logging can be carried out 24 hours…

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READ temperature

IF temperature > 60





3) The temperature of the water in a fish tank is controlled using a computer connected through an
interface box to sensors and a heater.
a) The analogue data collected from the temperature sensor is converted…

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humidity sensors
humidifiers (devices which spray water into the atmosphere to keep the air humid)
motors for the windows
Describe how these components form a control-feedback loop in this closed system. [6]

5) A central heating system is controlled by a microprocessor. This diagram shows part of the program…


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