Y10 CH 5 REVISION LESSON

​Input & Output devices

Multiple Select

Select which devices that you think are input devices?

• Inkjet Printer

• Touchscreens

• Sensors

• Loudspeakers

• Quick Response (QR) code readers

Multiple Select

Select which devices that you think are output devices?

• Inkjet Printer

• Touchscreens

• Sensors

• Loudspeakers

• Quick Response (QR) code readers

» print head - nozzles that spray droplets of ink onto the paper to form characters

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» ink cartridge or cartridges

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» a stepper motor and belt

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» a paper feed

INKJET PRINTER​

INKJET PRINTER​

» use dry powder ink

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» make use of the properties of static electricity to produce the text and images

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» print the whole page in one go

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» use 4 toner cartridges – blue, cyan, magenta and black

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» printing method is similar but coloured dots are used to build up the text and images

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LASER PRINTER​

LASER PRINTER​

APPLICATION OF INKJET PRINTER AND LASER PRINTER​

Multiple Choice

Laser Printers produce high quality printouts and are very fast when making multiple copies of a document

• True

• False

2D AND 3D CUTTERS

Both work similar ways but the main difference is 3D recognize object in x-y-z axis and not just x-y.

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Laser cutter can cut the following materials:

• glass

• crystal

• metal

• polymer

• wood​

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Multiple Choice

Which statement is FALSE about 2D and 3D cutters? Select one (1) only

• 3D cutter recognize an object in x-y direction

• 3D cutter can cut crystal

• 3D cutter can cut polymer

• 3D cutter recognize an object in x-y-z direction

• 2D and 3D cutter works in a similar way

ACTUATORS​

• When a computer is used to control devices, such as a conveyer belt or a valve, it is usually necessary to use an actuator to, for example, start/stop the conveyer belt or open/close the valve

• An actuator is a mechanical or electromechanical device such as a relay, solenoid or motor

ACTUATOR

MICROPHONE, SPEAKER, HEADPHONE/EARPHONE

SENSORS​

• Sensors are input devices which read or measure physical properties from their surroundings

• However, computers cannot make any sense of these physical quantities so the data needs to be converted into a digital format. This is usually achieved by an analogue to digital converter (ADC)

• When the computer is used to control devices, such as a motor or a valve, it is necessary to use a digital to analogue converter (DAC) since these devices need analogue data to operate in many cases.

• Actuators are used in such control applications.​

MONITORING & CONTROL APPLICATION

Multiple Choice

Sensors send converted signals (when necessary) to digital using (Digital to Analogue converter (DAC)

• True

• False

Multiple Choice

If new data is outside acceptable range, a warning message is sent to a screen or an alarm is activated. Is this Monitoring or Control application?

• Monitoring

• Control

Multiple Choice

If the new data is outside the acceptable range, the computer/microprocessor sends signals to control valve, motors, etc. Is this Monitoring or Control application?

• Monitoring

• Control

LED VS LCD MONITOR SCREEN

Poll

Videos help me understand the concept better

• True

• False

Poll

Do you think the videos that I showed you today are helpful in your understanding?

• Yes

• No

​End of Slides