AS ICT. Have an understanding of how organizations use ICT. Be able to describe a number of uses, giving the hardware and software requirements.

AS ICT

Have an understanding of how organizations use ICT.

Be able to describe a number of uses, giving the hardware and software requirements.

Be able to describe the applications that these uses can be put to.

Uses microprocessors or computers to control certain physical conditions, either Keeping them the

same over a period of time or

Varying them according to predefined values/lengths of time

Maintaining constant physical conditions: Air conditioning systems Central heating systems Refrigeration Medical applications: Intensive care Car Manufacture plants Process Control

Physical conditions (variables) that are controlled by computer/microprocessors include: Temperature Pressure Humidity Light Moisture etc

Numeric KeypadPush buttons/switchesTemperature sensorMoisture sensorPressure sensorLight sensorContact Switch

ADCDACTimerAlgorithms to

compare data from sensors to predefined values or ranges

RobotFansHeatersBoilersBuzzer/alarmLightsLED display

Sensors are needed to monitor temperature (continuously)

Microprocessor compares the temperature with a preset value/range

Depending on result microprocessor causes the fan motor to speed up or slow down

Fan motor switched on or off

Inputs Processes Outputs

Buttons/touchscreen

Sensors monitor temperature continuously

LED display

Contact switch Analogue data from sensors converted to digital using ADC

Fan

Temperature sensor

Temperature compared to preset range/value

Buzzer

Pressure sensor Signal sent to actuator to switch fan on or off

Output directly affects the input

No human intervention is necessary

Good for situations where control is required 24/7, or in a dangerous/difficult environment

Sensors continuously monitor temperature

Microprocessor compares the temperature with a preset value/range

Depending on result microprocessor causes the fan motor to speed up or slow down

Fan motor switched on or off

Inputs Processes Outputs

Contact switch (door)

Sensors monitor temperature continuously

LED display

Pressure sensor (door)

Analogue data from temperature sensor converted

to digital by ADC

Compressor

Number pad or dial Temperature compared to preset range/value input by

user

Buzzer

Temperature sensor

Signal sent to actuator to switch compressor on if temp

is too high

Signal sent to actuator to switch compressor off if temp

is OK

Sensors are needed to monitor temperature (continuously)

Microprocessor compares the temperature with a preset value/range

Microprocessor controls two actuators one opens gas valves in the boiler the other switches the pump on

Inputs Processes Outputs

Touch screen Sensors monitor temperature continuously

LED display

Number pad or dialAnalogue data from

temperature sensor converted to digital by ADC

Radiators

Temperature sensor

Temperature compared to preset range/value input by

user

Signal sent to actuators to switch pump on & open valves

if temp is too low

Signal sent to actuator to switch pump off/close valves if

temp is OK

BoilerHot water cylinderPumpRadiatorsTemperature sensors

CompressorsHeatersCondensersPumpsFansTemperature sensorsMoisture sensorsPressure sensorsLight sensors

Control software