Lecture 1.1 - Electrical Circuits

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Из курса от партнера University of California, Irvine

Interfacing with the Arduino

1537 оценки

University of California, Irvine

Interfacing with the Arduino

1537 оценки

Курс 3 из 6 — Specialization An Introduction to Programming the Internet of Things (IOT)

Arduino senses the environment by receiving inputs from add-on devices such as sensors, and can control the world around it by adjusting lights, motors, and other actuators. In this class you will learn how and when to use the different types of sensors and how to connect them to the Arduino. Since the external world uses continuous or analog signals and the hardware is digital you will learn how these signals are converted back-and-forth and how this must be considered as you program your device. You'll also learn about the use of Arduino-specific shields and the shields software libraries to interface with the real world. Please note that this course does not include discussion forums.

Из урока

Module 1

IoT devices involve a combination of software and hardware. This module provides background on the basics of hardware design and wiring needed to build useful circuits. This module describes the functions of basic passive components and describes how to use them in simple circuits. This module also describes how to wire circuits together using a breadboard. The goal of this module is to enable students to design and implement the circuits they need to interact with basic sensors and actuators.

Lecture 1.1 - Electrical Circuits4:12

Lecture 1.2 - Electrical Properties6:46

Lecture 1.3 - Ohm's Law3:32

Познакомьтесь с преподавателями

Ian Harris
Professor
Department of Computer Science

[MUSIC]

So, in a thing's components are designed from hardware and software combined.

So you don't just have the software that you write, just have the code,

it's always wired to some kind of different hardware components to make

something happen in the real world or to receive information from the real world.

So a combination of hardware and software, and

this is part of what makes them harder to design than traditional systems.

So, it's not just a traditional software system like desktop software and

all you think about is the code and then you make it run on an arbitrary desktop.

In this case, you're writing software but for a specific hardware platform.

And a hardware platform that may not be developed yet, right?

Actually in big companies this is a big issue, right?

You wanna start writing your software and designing the hardware at the same time.

But how do you write your software when you don't even know what the hardware is

that it's going to be running on.

So, there are lots of different techniques that people use to do that.

In our case though, a little bit simpler, we know that we're using our platform,

but we may not know the details of the circuit.

But still in the end you have to design both sides and they have to work together.

So, the hardware is what really interacts with the physical world.

It does everything.

It receives input from the outside.

It actuates, so it does things on the outside world.

So maybe is has a microphone that picks up sound.

It has a speaker that outputs sounds, something like that.

So, it's the hardware that's actually interacting with the outside world.

But it's actually the software,

usually the software that acts as the intelligence let's say.

So the software takes the data received from the hardware,

interprets it in some way, and then causes the hardware to do something,

orders the hardware to do something.

So for instance, say you've got some kind of sound going on.

The sound and your system's supposed to hear the sound.

And if somebody says a word, then it should trigger a behavior.

So let's say when somebody says, turn on TV, the TV should turn on.

So you'll have a microphone that's receiving the information,

receiving the sound, the words, turn on the TV.

Then, the software will process that information, realize what the words are,

turn on TV.

And then it'll say, whenever I see that I want to turn on the TV.

So, then, it'll have an actuator.

That drives some hardware that actually activates the TV turning it on.

So, that's the way I think about it, the software is the intelligence inside, but

the hardware is actually doing all the work, so you need both.

So because of that we need to know a little bit about electrical circuits

right, we gonna be building some small circuits.

Now, I don't want this class to be heavily an electrical engineering class

circuit design is a hard thing, but

when you're doing this type of IoT design you need to know a little bit.

Not much, but a little bit.

Most of this, in the class, we are focusing on software.

But there is this hardware side and we need to know a little bit.

So, we're gonna talk a little bit about electricity and

we'll start with some real basics.

We're gonna talk about current going through a circuit.

And we're going to compare that to water going through some kind of water

pumping system.

It's a very similar analogy.

It's a common analogy for explaining electronics.

So, you see on the left side of the screen,

you got electrical current flowing through a wire.

So, you got a battery over there.

It's got a plus terminal, minus terminal and current

flows through that wire that connects the plus terminal to the minus terminal.

It goes from the plus to the minus through the wire.

Now that is similar to a water pump system.

So you got some pipes, right?

And there's a pump that you see there.

And this pump is pumping the water through the circuit.

And it's a very similar idea and so

that's the analogy that we're gonna be talking about for a few slides.

And note that in the electrical circuit,

the battery is pushing the current, providing the power it needs.

In the water system, the water pump is pushing the current through.

But they are performing similar functions.

Thank you.

[MUSIC]

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