System Components

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Internet of Things Capstone V2: Build a Mobile Surveillance System

加州大学圣地亚哥分校

课程 6（共 6 门，物联网专项课程）

In the Capstone project for the Internet of Things specialization, you will design and build your own system that uses at least 2 sensors, at least 1 communication protocol and at least 1 actuator. You will have a chance to revisit and apply what you have learned in our courses to achieve a robust, practical and/or fun-filled project. We absolutely encourage you to design whatever you can think up! This is your chance to be creative or to explore an idea that you have had. But if you don’t have your own idea, we provide the description of a surveillance system, for you to build. We will participate in the Capstone with you by building a surveillance system that features an off-grid solar powered workstation that will serve as a hub to multiple surveillance sensors. You will be able to demonstrate the knowledge and skills you have gained in this course through delivery of industry-appropriate documents such as System Design documents and Unit Test reports. Additionally, you will be asked to describe and show case your project as a short video presentation – appropriate for demonstrating your knowledge and technical communication skills. Learning Goals: After completing this Capstone, you will be able to: 1. Design systems using mobile platforms. You will gain experience in documenting and presenting designs. 2. Develop systems that interface multiple sensors and actuators to the DragonBoard™ 410c system and develop the necessary software to create a fully functional system. 3. Specify unit tests and system tests, run tests and prepare Test Reports as are commonly done by those working in this industry. 4. Gain experience (and feedback!) in making technical presentations.

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从本节课中

Capstone, Part 1 - Getting ready

This section will go over the approach our team took while setting up the Capstone project. Here you will see some diagrams, as well as the system components which were used to build our entire systems. We offer recommendations, highlights and examples as to how you can reduce or expand on the project we provide as a template.

Introduction to Part 12:24

System Components10:31

More examples9:06

A look back at Part 12:22

教学方

Ganz Chockalingam
Principal Engineer
Harinath Garudadri
Associate Research Scientist

脚本

Welcome back.

It's time now to talk to you about the components that we will be using for

this particular system we plan on building in part two or later on in this course.

Here we go. Now I just want to remind you that

these components that we're going to show you,

we're just showing you kind of an over all characteristic of the components.

You will be able to find links to all of these stuff

that they we're going to show you later on after the videos.

But please remember that you can always go out and search for

components or devices with these similar characteristics.

Now you might not find that exact solar panel is available to you,

maybe a better version is available for you and even cheaper, you never know.

By the time you're building your system you just never know.

Also if you want to build something more powerful, do that too.

So here we go, let's dive in here.

Now you can see here,

we're going to kind of follow the path that we did in the chart earlier right?

So we started with the solar panels.

Here's the solar panels that we chose to use.

In general we were restricted not only by what

we wanted to power the load of our system but also size, right?

We wanted to make our system portable enough to roll around.

And we'll talk about the case we use later but

these panels were chosen because we wanted them to fit on the case and

we also wanted them to fit in our case for transporting reasons.

Now these panels, Eco-Worthy Solar Panels,

you can see some other characteristics there, Power 10 Watts,

open circuit voltage, that's what the OC stands for, 20.6 Volts.

Short circuit current which is 0.69.

Now, if we wanted to for example, put two of these panels in parallel, right.

Well we would be adding two of the currents, right.

So then if we put one alone then we would

have 0.69 amps provided to our charge controller which comes next.

But if we put 2 in parallel you could see there ISC Total, so

I short circuit total would be 1.38 Amps.

You would add them because they're in parallel.

Same can be said if we added the voltage in series,

so we put two of these panels in series, then open circuit

voltage would add and we would end up with 21 or 41.2.

So, 41.2 Volts, open circuit voltage.

All the rules have circuit analysis supply to this as well.

Now, we wanted to pair this or at least stay within the boundary of our

Charge Controller, the brain of the system.

And, the panels feeding to the Charge Controller and

look what the Charge Controller is capable of.

So, Charge Controller is capable of

a open circuit voltage of a max of 40 volts, right?

So that being said, we almost couldn't put these two panels and pair in series.

Sorry.

because if we put them in series we'll be pushing that threshold very close.

Now, the charge controller is capable of 30 amps short circuit.

So, we are way under the limit on the short circuit current.

That means that if we wanted to, we could put a bunch more of these

panels in parallel and beef up that amperage.

All right. Cool.

So that's kind of some of the characteristics of this charge controller.

We wanted it mainly because it had the built in display.

You can find I think one was like $32 or something around there.

You can find a lot cheaper charge controllers with

right around the same characteristics for $10, $9.

And then you can buy a little separate digital voltage display or

current display, and you can make your system that way as well.

All right. So

next one, next component, we have the battery and the inverter.

Now, on the right side, you see the battery?

This was tricky to choose.

And in fact, we reached a lot of problems because the batteries in general,

you want more amp hours right and you want to still keep it at 12 volts.

So, the amp hours allow you to run the system for a longer period of time.

But the more amp hours, the bigger the battery,

the heavier the dimensions get out of control and you can no longer

use a smaller case anymore especially if you want to store your panels.

You want to keep that in mind when choosing your battery.

You might not need your system to be powered for that long so maybe you could

choose less amp hours, keep your voltage at 12 and choose less amp hours.

The possibilities are endless on your end.

We chose to use this one and we went with just a little bit of a bigger case,

a rolling case that you'll see later.

After the charge controller feeds into the batteries,

you have the inverter that then boosts up your voltage and allows you to use many

of your household items that you might want to take with you with the system.

So, our inverter right there is Smart &Cool Inverter, 12 volts DC

and the output is 110 volts AC.

So there, you can see that

this inverter 350 watts, is capable of

I would say almost anything you would want in your little portable system.

I don't think, unless you want to power a microwave or an air conditioner or

something, you're not going to get that out of this inverter.

Either you're going to system, you're going to need more batteries,

you're going to need so much more stuff.

So you're just keeping to your mobile surveillance dragging board 410C

work station.

I think 350 watts should be enough.

You can probably get 400, maybe 500,

that'll allow you to do a little more stuff.

But then you're going to want to bring a bigger battery so

that you can power the stuff longer.

It's all up to you.

Again, so many variables for you to have fun with.

So now that we've chosen all those main core components where are we

going to put the stuff?

Right here. Well this is what we picked out.

So a DeWalt rolling tool case.

You can see kind of like an example of the size that it is up there.

We stepped up the size we originally wanted to carry it around with us.

But instead decided to make it a rolling case because, again I've told you,

the batteries and the panels, we wanted everything to be stored in there.

[COUGH] Essentially what we're going to do is we're going to mount the panels on top

of the case.

All of the circuitry will be in the bottom end of the case or

the bottom part of the case.

And then you'll have a layer on top for your workstation.

And the open up, the side that opens up, you'll have a monitor

in a way to monitor also the charge of your station.

So you'll have access to your charge controller which is essentially the core

component that you read off, how your system is doing, but

you will also have access to a small screen that the DragonBoard

we'll be using in order for you to kind of work on your DragonBoard, of course.

Sensors and cameras and all of that other cool surveillance stuff.

Well, we're going to try doing as much as possible with that, but

we are also going to leave all the choices that you might be

able to kind of switch this around and make it even cooler up to you.

So we will provide some examples but in the end,

the mobile surveillance system is your own brainchild.

[LAUGH] So go wild,

do what you can with that and I'm pretty sure we'll see a lot of really cool stuff.

Talking a little more about this case,

I just want to make sure that you kind of get an ideas to why we chose this.

The dimensions as you can see up there.

I'm sorry it's in inches.

I know the rest of the world is in the metric system,

but we're still in inches over here.

So conversion, one inch is 2.54 centimeters.

You can kind of do the math there.

We wanted weatherproof.

So as you can see it's water resistance.

It's capable of, in the bottom right, I'm reading the bottom right.

It's water resistant.

It's capable of 88 pounds.

2.2 pounds is 1 kilogram.

So it's capable of holding enough weight for us.

Essentially we can load in our battery, load in all our components.

We can load in maybe a few extra things, the DragonBoard,

the screen and and a tray that we need and

we can just roll it away with no problem at all, nothing is going to break.

It's lockable and

essentially you can see there that it has pretty much everything we need in a case.

We are hoping that you like our choice, and

again feel free to choose anything that you are comfortable with.

Now just a quick little anecdote from us is that while we

were choosing our components make sure you have a tape measure,

make sure you are constantly measuring everything,

because you are going to need to make sure you, before you order anything make sure

your components are going to fit nice and snug and organized inside of your case.

This is a problem because you're also going to to have to take into account

the cables, the connectors, the wiring, the positioning of everything and

make sure measure twice, cut once.

Essentially measure twice, order once, and

you will have the right components that you need.

Most of the time when you are ordering,

there's sheets like this that show you all the dimensions.

So, you should be okay with that.

I would recommend buying the case first,

and then from there building your system as you need it.

So, as you've seen, these are all the components that we will be using,

there will be links provided to you.

I will also be providing to you the link for

a particular five inch monitor that we will be using in the system.

I would suggest checking out all of your options wherever you are and

making this kit, this system, your own.

Because that's what the caption is all about.

Making it your own and using this as a guideline.

So we will be providing for you a lot of

really cool examples throughout this especially in part two.

But just keep that in mind that we will look forward to seeing your ideas and

your experiments.

So, we'll see you in the next video.

Thank you.

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