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 Keypad  Push buttons/switches  Temperature sensor  Moisture sensor  Pressure sensor  Light sensor  Contact Switch

 ADC  DAC  Timer  Algorithms to compare data from sensors to predefined values or ranges

 Robot  Fans  Heaters  Boilers  Buzzer/alarm  Lights  LED 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

InputsProcessesOutputs Buttons/touchscreenSensors monitor temperature continuously LED display Contact switchAnalogue data from sensors converted to digital using ADC Fan Temperature sensorTemperature compared to preset range/value Buzzer Pressure sensorSignal 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

InputsProcessesOutputs 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 dialTemperature compared to preset range/value input by user Buzzer Temperature sensorSignal 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

InputsProcessesOutputs Touch screenSensors monitor temperature continuously LED display Number pad or dial Analogue 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

 Boiler  Hot water cylinder  Pump  Radiators  Temperature sensors

Control systems require:  Compressors  Heaters  Condensers  Pumps  Fans  Temperature sensors  Moisture sensors  Pressure sensors  Light sensors

 Control software