Lesson video

Hi everyone, my name is Mrs. Jenkins.

I can't wait to learn with you today.

Welcome to today's lesson taken from the unit "Computer networks." Today's lesson is called "Designing a digital device." By the end of today's lesson, you will be able to design a digital device.

Before we begin our lesson, we're going to look at some keywords that will feature throughout the lesson.

It's really important that we understand what they mean before we get started.

The words are digital device, input, process, and output.

A digital device is an object that uses computer technology to work.

It stores or processes information.

So that's a digital device.

Input is data that is sent to a programme to be processed.

So that was input.

Process is a programme or part of a programme which is running on a computer.

So that is process.

Output is the result of data processed by the computer.

That was output.

So those words are digital device, input, process, and output.

Keep an eye out for them throughout the lesson.

They will be in bold on the slides.

Today's lesson, "Designing a digital device," has two learning cycles.

"Identify input and output devices" and "Design a digital device." We're going to start with "Identify input and output devices." Digital devices must have an input, process, and output.

For example, to write on screen.

For the input, you press a button on the keyboard.

For the process, a programme is run on a computer, which sets what happens when a key is pressed.

And then the output, you see the letter that matches the button that you pressed on the screen.

Jun asks us, "What is an input?" Sofia's got a great answer.

"An input is something that goes into a device.

It instructs the device what to do." Ah, Jun has now asked, "What is an output?" And Sofia explains, "An output is something that comes out of a device.

It shows you what the device is doing." Do you recognise any of these input devices? We have a keyboard, a mouse, a webcam, a microphone, and a pedestrian crossing.

Input devices can be used to cause a process to happen.

For example, a keyboard press, a mouse click, or a button press.

Do you recognise any of these output devices? A printer, a green crossing light, speakers, and a computer screen.

An output device delivers the results of an input and process, including showing text or images on screens or playing music through speakers.

True or false? A speaker is an input device.

Have a go.

How did you get on? I asked you, true or false? A speaker is an input device.

The answer is false, a speaker is an output device.

We hear the sound coming through the output.

Jun's got a really good question.

"Are devices only input or output?" And Sofia explains, "No, some devices can be both input and output devices.

A touchscreen is a great example.

You touch it for an input and it shows you something for an output." Thank you, Sofia.

We have some examples here of some input devices, output devices, and some that are both.

For the input devices, we have a keyboard, a webcam, and a mouse.

For the output devices, we have a pedestrian crossing signal, we have speakers and a computer screen.

For some that are both, we have a touchscreen phone, a multifunction printer, and the pedestrian crossing button that we have to press the button but it also processes the instruction and shows us the wait symbol.

Jun asks us, "Why is the printer in the middle of the Venn diagram?" Good question, Jun.

Some printers are multifunction devices, which include a photocopier, scanner, and printer.

Multifunction printers have inputs such as touchscreen, photocopier and scanner.

There are also outputs such as printing.

Let's have a little check.

Which object is both an input and an output device? A, a mouse; B, a touchscreen; or C, speaker; or D, a cable.

Have a go.

How did you get on? I asked you, which object is both an input and an output device? A mouse, a touchscreen, speaker, or a cable? The answer is touchscreen.

Great job, everyone.

For Task A, I would like you to fill in the blanks on the table to complete the input and output devices.

So we have an example on the first row with button being the input, the doorbell being the digital device, and the output is the sound.

So when you press the button, the doorbell will make a sound so you know someone is at your front door.

So we've got a few blanks.

We have a touchscreen and a tablet, but we have no output.

Then we have no input, we have a pedestrian crossing controller and the green light shows.

For the last one, we have a controller and a toy car, but we have no output shown.

Have a go.

How did you get on? I asked you to fill in the blanks on the table to complete the input and output devices.

I gave you an example that if a button is pressed on the doorbell, a sound will play.

Let's have a look at the answers.

Okay, for the touchscreen, if we touch screen on a tablet, the screen or the speakers will make a sound or display a picture.

For the pedestrian crossing controller, the output was the green light shows, so the input was a button.

For the final one, we had the controller for the toy car.

That gives the motor to make the wheels move.

Great job, everyone.

We're going to move on to the second learning cycle now, "Design a digital device." How do digital devices work? We have an input, a process, and an output.

True or false? All digital devices need an input.

Have a go.

How did you get on? I asked you, true or false? All digital devices need an input.

The answer is true, they do need an input in order for them to work.

So to go back to our question, how do digital devices work? We have the input, which is how the device gets information.

We then have the process, which is what the device does with the information.

And then we have the output, and that is what the device does next, so often that might be speakers or an image showing.

If we had a smart doorbell, when you press the doorbell, it is the input.

The process is it sends a message to the app.

And then the output is your phone shows a video.

Okay, so that was for a smart doorbell.

What is the output in this example? You tap a screen, the device adds up the score, it plays a sound.

Is it A, tapping the screen; B, adding up your score; or C, playing a sound? Have a go.

How did you get on? I asked you, what is the output in this example? You tap a screen, the device adds up the score, and it plays a sound.

Was it A, tapping the screen; B, adding up your score; or C, playing a sound? The answer was C, playing a sound.

You are going to design your own digital device.

Some things to think about.

What is it for? A tool, a toy, something helpful? What will the input be? What is the process? And what will the output be? Here are some ideas that might help you.

A robot pet.

A talking lunchbox.

A helpful homework buddy.

A mood changing light.

What would yours do? For Task B, I would like you to draw your device and label its input, so what controls your device? Its process, what does your device do? And its output, what does it show or do? And explain how your device works in a sentence.

Have a go.

How did you get on? I asked you to design a digital device and I asked you to draw your device and label its input, so what controls it? Its process, what does it do? Its output, what does it show or do? And explain how your device works in a sentence.

Okay, I'd like you to share your designs with your class and discuss what inputs and outputs your device has.

Everyone's ideas will be different, so your answer may be different.

My design was a teddy bear.

For the input, you press the tummy or the hand.

For the output, the nose lights up and the teddy makes a noise.

The process, the controller checks what was pressed and decides which action to take.

Great job, everyone.

You have worked so hard in today's lesson.

Let's summarise what we have learned today.

Digital devices must have an input, process, and output.

Digital devices work by having an input, which is the control.

It is how the device receives its information.

The process is what the device does with the information.

The output is what the device does after the input and process.

You have worked so hard today, everyone, well done.

I hope to learn with you again soon.