Lecture 1.2: IoT Devices

Loading...

Del curso dictado por University of California, Irvine

Introduction to the Internet of Things and Embedded Systems

3867 calificaciones

Explore Related Videos

At Coursera, you will find the best lectures in the world. Here are some of our personalized recommendations for you

University of California, Irvine

Introduction to the Internet of Things and Embedded Systems

3867 calificaciones

Curso 1 de 6 en SpecializationAn Introduction to Programming the Internet of Things (IOT)

The explosive growth of the “Internet of Things” is changing our world and the rapid drop in price for typical IoT components is allowing people to innovate new designs and products at home. In this first class in the specialization you will learn the importance of IoT in society, the current components of typical IoT devices and trends for the future. IoT design considerations, constraints and interfacing between the physical world and your device will also be covered. You will also learn how to make design trade-offs between hardware and software. We'll also cover key components of networking to ensure that students understand how to connect their device to the Internet. Please note that this course does not include discussion forums. Upon completing this course, you will be able to: 1. Define the term “Internet of Things” 2. State the technological trends which have led to IoT 3. Describe the impact of IoT on society 4. Define what an embedded system is in terms of its interface 5. Enumerate and describe the components of an embedded system 6. Describe the interactions of embedded systems with the physical world 7. Name the core hardware components most commonly used in IoT devices 8. Describe the interaction between software and hardware in an IoT device 9. Describe the role of an operating system to support software in an IoT device 10. Explain the use of networking and basic networking hardware 11. Describe the structure of the Internet 12. Describe the meaning of a “network protocol” 13. Explain MANETs and their relation to IoT

De la lección

What Is the Internet of Things (IoT)?

The Internet of Things (IoT) is a popular buzzword right now, but unlike many fads which have come and gone, the Internet of Things describes an important trend which is having lasting effects on society at large. The term itself, “Internet of Things”, is used to mean a variety of ideas, depending on the motivation and background of the speaker. This course will start by providing a definition of the term. We will talk about how various trends have enabled the Internet of Things, and how it changes the way design is performed. We will also discuss some of the ramifications that IoT is having on society today.

Lecture 1.1: IoT Example: The Refrigerator10:09

Lecture 1.2: IoT Devices9:16

Lecture 1.3: IoT Devices vs. Computers6:47

Conoce a los instructores

Ian Harris
Professor
Department of Computer Science

[MUSIC]

This lecture will give some more examples of the Internet of things devices.

Just to give you a sort of a better more concrete idea of what these devices

are and how they differ or how they're distinct from traditional computers.

So we'll run through a few more examples and

get a little more detail about their behaviors.

So take a car, a car is an IoT device, I will claim.

Okay, the reason I call it this is,

because if you look at a car, Ii's a thing, clearly.

You look at a car, an old car, there's an old car, a 50s car maybe.

So old cars had a certain interface, right?

You drive, you have a steering wheel, gas pedal, brakes, and so on, the radio,

sort of a simple, straightforward interface.

What I would consider to be simple.

Now that interface, it was basically implemented with electrical and

mechanical controls, but there was no computational intelligence in there.

Early cars, they didn't have computers in there, processors doing anything.

There was electricity, there's mechanical stuff, but that was it.

So that was an original device, it's not IoT, from the 50's.

But nowadays cars have lots of computational intelligence.

Let's take a look at this.

So, 21st century car.

So what is that?

Looks like a Prius I think.

This car, its got lots of chips in it, so lots of processors.

That car might have over 50 processors in it doing different tasks.

For instance its got an anti-lock braking system they all do these days and

the anti-lock breaking system,

it'll have its own processor dedicated just to anti-lock braking.

And so, its got that.

Its got fuel injection, right?

Fuel injection system, its gonna have another processor dedicated to that.

So every sub system has its own processor.

And it's also got a stereo, say.

Stereo system's got to have it's own processor, but

every subsystem inside the car has it's own processor.

But the thing about this car that you notice about this device,

is that even though it has this computational intelligence,

it has the same basic interface as that 50s car.

So you drive this car pretty much the same way.

Now the 50s car, it probably had manual transmission, I'm gonna guess,

because it's the 50s.

So this will have automatic transmission.

But besides that, it has the same interface, the same steering wheel,

gas pedal, brake.

So you could train somebody to drive on the 50s car and they could drive this new

car, even though this new car is enhanced with all this computational intelligence.

So, that's the thing about IoT devices, they have a very simple interface.

They want to be easy to use, they want to give you the benefit of this computational

intelligence, so now you have anti-lock breaking for instance.

And anti-lock breaking in case you don't know,

anti-lock breaking, it prevents the tires from locking, so

you don't want the tires to skid compared to the road, right?

They should always stay in good contact with the road.

But if you brake hard, if you"re moving fast,

you brake hard, the car will skid and the tires will not move but the car will move.

So anti-lock braking tries to prevent that.

Now, before anti-lock braking,

what you used to do, I remember when I learned how to drive on snow.

You skid a lot, right?

So what you do, is when you do a hard break, you'll pump the breaks, right?

Manually pump the breaks.

And you'd have to remember this,

you'd have to be pretty consciously aware enough to remember to do this.

Anti-lock breakings do that for you, right?

Excellent breaking devices, they take care of that for you.

So this is a great benefit to drivers nowadays.

Kids they don't even know about pumping breaks.

They don't learn that because they don't have to,

anti-lock breaking takes care of it.

So the computational intelligence is helping you,

reliving you of burdens that you didn't wanna have to deal with.

But the interface is beautiful.

You don't have to worry, you just hit brake pedal just like you used to.

It just does better.

It just does what you want it to do, does better and

makes everything easier for you.

Now, a typical car like this car that we're looking at right here.

This car, it has computational intelligence, now whether or

not it has networking is a different thing.

Cars now a days, actually these days, cars are having more and more networking.

And you may have heard of this in the news, but cars are networked actually,

so you can, for instance, remote start a car, right?

Start it when you're not near the car, you can start it through the network.

Cars also have, what do they have in there?

Those, I forget the name of the brand, there's OnStar, is one brand name.

But when there's an accident, the car can, through the Internet,

connect with 911 and call and get help, right?

So this type of thing is present in cars.

My car does not have that.

But I'm cheap and I'm a professor, I buy old cars.

So my cars are old but new modern cars have these features built in there [LAUGH]

and they are actually networked.

So that would be a modern car.

The most modern car, that would be an IoT device because it has the computational

intelligence and it's also networked to add extra flexibility.

So, that's one device.

Let's take a look at another.

Let's talk about logistics.

Tracking things okay, logistics.

So say you are Walmart or some big company or your the military, something like that,

and you want to move lots of things between different

places on a certain time scale, right?

You need to get these from this manufacturing place to this sales

place on this schedule.

That's logistics.

And the military is all about logistics, right?

We are waging a war.

We need to get these devices from here to here and

these people from here to here on this time frame.

So you wanna move things.

So say you're Walmart, and

you would have to be able to track these devices that you're moving.

You wanna make sure that they are moving place to place in a certain time frame.

And you want to be able to at any time, be able to say,

where is box number whatever, right?

How many boxes do we have of this type of device at this location at this time?

And you need to be able to track that dynamically, so

you can get count for things like, weather difficulties, right?

Maybe the planes are shut down so

you can't move enough devices from here to here.

So you need to know how many are here so you can reroute things.

So, to do that, one way, a very common way, is to use barcodes.

This helps you because every box, every device, it has a barcode which has some

basic information about what's in the box, right?

And where the box came from, stuff like that, gets stuck on the box.

Now, barcodes are in very common use today.

We use barcodes, if you look at any food item, you go to the supermarket and

you check yourself out, you run the barcode over the scanner.

So barcodes are very useful and they have a certain amount of

information on there and they make it so that you can just scan the device and

find out information about the device, or whatever it is, the box.

And it makes it easy to track.

So this is basically old technology, barcodes have been around for a long time.

Nowadays, you also find RFID tags.

So RFID tags, you can see the antenna, for one, right there.

It's basically an electronic version of a bar code.

And what you're seeing is that sort of spiraling wire,

that's actually the antenna, okay?

A remote antenna.

And what RFID tags allow you to do, why they're an improvement over barcodes is,

the first thing is, they basically have a processor inside there.

So you can have a lot more information about the device than what you

could encode inside a barcode, right?

A ton more information.

And that information can change, right?

Because barcode, once you print that on the box, that will never change, right?

Until you rip off the barcode, put a new barcode on.

But that data can never change.

With an RFID tag, that thing could have flash memory in there if you want to,

that actually reloads, that gets changed and updated over time.

So for instance, if you want to track where a box moved, t he box itself and

it's RFID can store that information over time.

So, as it moves from place to place you can store that and

you can see the whole path that the box took, all right?

So, RFID another benefit of these,

is that you don't have to be right next to them to scan them.

So, if you know anything about a barcode, you have to take a scanner and

put it right up to the barcode in order to scan it, you have to try, right?

You have to, I mean, if you ever scan, like just yesterday I was at Albertson's,

scanning food out.

I have to work to get that scanner directly over my barcode, right?

With RFID tags, there's a range.

So you just have to be within proximity.

You don't have to have any particular orientation.

Just be near it, which is helpful, right?

Then you can just run every box near a scanner, and it'll catch it.

So RFID tags have a lot of advantages over barcodes and they can easily be networked.

So the scanner can be network connected to the Internet so

you can keep constant track of where all your boxes are at some global site.

So Walmart can know where every box is and what manufacturer, what plant it's in.

And they can keep it all centrally because the IoT RFID scanner is

actually connected on the network to its main cloud service.

So, devices can become an IoT device if you put RFID tags and

the computational intelligence on to them.

Thank you.

[MUSIC]

Explora nuestro catálogo

Inscríbete de manera gratuita y obtén recomendaciones personalizadas, actualizaciones y ofertas.

Coursera brinda acceso universal a la mejor educación del mundo, al asociarse con las mejores universidades y organizaciones, para ofrecer cursos en línea.

© 2019 Coursera Inc. Todos los derechos reservados.

Descargar en la App Store

Consíguelo en Google Play