Video Demonstration: Arduino Blink Example

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Do curso por University of California, Irvine

The Arduino Platform and C Programming

3016 classificações

University of California, Irvine

The Arduino Platform and C Programming

3016 classificações

Curso 2 de 6 em Specialization Introdução à Programação aplicada à Internet das Coisas (IOT)

The Arduino is an open-source computer hardware/software platform for building digital devices and interactive objects that can sense and control the physical world around them. In this class you will learn how the Arduino platform works in terms of the physical board and libraries and the IDE (integrated development environment). You will also learn about shields, which are smaller boards that plug into the main Arduino board to perform other functions such as sensing light, heat, GPS tracking, or providing a user interface display. The course will also cover programming the Arduino using C code and accessing the pins on the board via the software to control external devices. Please note that this course does not include discussion forums. Upon completing this course, you will be able to: 1. Outline the composition of the Arduino development board 2. Describe what it means to program the board's firmware 3. Read board schematics 4. Install Arduino IDE 5. Describe what "shields" are and how they are used 6. Specify the role of libraries in the use of shields 7. Compile and run a program 8. Name C Variables and Types 9. Name common C operators 10. Use conditionals and loops 11. Explain functions, their definition and invocation 12. Explain the implications of global variables 13. Undertake the Arduino build process 14. Describe the role of the tools behind the IDE 15. Describe how to invoke functions in classes 16. Explain the structure of an Arduino sketch 17. Access the pins of the Arduino 18. Differentiate between digital and analog pin 19. Debug embedded software 20. Explain the importance of controllability and observability in the debugging process 21. Describe common debugging architectures for embedded systems 22. Explain how the UART Serial communication protocol works 23. Describe how the Arduino Serial library performs serial communication

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Arduino Programs

This module describes the composition of an Arduino program, or sketch, and the process by which it is compiled and uploaded. The Arduino IDE is a user interface for the software tools which actually compile and upload the program. We outline the use of these tools in the build process. We describe the basic structure of a sketch, including the use of the setup() and loop() functions. The main interface of an Arduino is through its pins, so we describe how to access those pins from a sketch.

Lecture 3.1: Input and Output6:52

Lecture 3.2: Blink Example5:48

Video Demonstration: Arduino Blink Example4:55

Conheça os instrutores

Ian Harris
Professor
Department of Computer Science

[MUSIC]

In this demonstration we're just going to wire a very simple circuit connected to

the Arduino.

All we're gonna do is the blinking light example, which we've already done.

Except we're gonna have the Arduino blink an LED that is not built into the Arduino.

So we're just gonna walk through this, just so

you get the idea of how you connect something to the Arduino and make it work.

And if you look at the Arduino right now.

It is now plugged into through USB, so it's getting power.

And it's already running the blinking example, so

you can see the little LED on there blinking off and on.

That's the LED that's connected to pin 13.

That's blinking off and on.

Just to let you know, that program,

that's exactly what's running in the Arduino right now.

So, before we wire this together I will

disconnect the Arduino from power, that's always safe.

Okay, so we'll put that to the side for a second.

Now, let's look at the other components we've got.

We've got an LED right here.

There we go, LED.

We've got a resistor, this is 220 ohm resistor.

There we are.

The two leads resistor.

And we got a couple of wires, red one, and black.

Right, got some wires.

So we're gonna wire this together.

What we wanna do is, we wanna connect this LED up to pin 13 of our Arduino.

So one side of the LED has to be connected to pin 13, the anode, the positive side.

The negative side is gonna be connected through the resistor to the ground.

Now why through the resistor?

The reason why we have to connect it through the resistor is because

if we don't, then our circuit will have very little resistance.

Just very low resistance, whatever's in the LED.

You'll have so little resistance that will have a lot of current going through.

And this LED is rated at 20 milliamps I believe, so

if we drive it with more than 20 milliamps we will likely destroy it.

So we need to give it some resistance just to reduce the amount of current.

220 ohm resistor right here should be sufficient for that.

So, let's wire them together.

First, let's put the resistor in, and we can plug it into two arbitrary holes.

Okay, so we've plugged it into two holes.

Here and here, you can see that.

Then I will take the LED.

Now the LED, we need to connect it to the resistor, but

we need to connect the cathode to the resistor.

The anode we wanna connect to pin 13.

So the cathode, we look at this, a little hard to see around my hand here.

One leg is shorter than the other.

So the short leg is the cathode,

that's gonna go to negative side, toward the ground.

And the long leg, the anode, is the positive side,

that's gonna go to the pin 13.

So, take and plug in the short legged side into the same row as the resistor.

Okay, so, now it is connected.

They are on the same row so they are connected.

And the long leg side will just shove in to any other row.

Force that in here, there we go.

Okay, so now we've got the LED connected to the resistor.

But this is in no way connected to the Arduino, so now let's go for that.

We'll take our black wire and connect that to one side of the resistor.

And we're gonna connect that to ground.

Now we're gonna get ground from Arduino, so

we have several grounds labeled on the Arduino and here goes one right here.

So just plug it in, yeah.

Yeah, you can see wired into the ground of the Arduino.

So one end of the resistor is connected to ground in the Arduino.

Now the other wiring we need to do is to take the LED, the anode runner.

Plug this red into the same row as the anode.

And now connect the anode to pin 13.

And what'll happen then, 13, yep, what'll happen then is

that when we power this on, the LED on the board will still blink.

But this other LED on the red board will also blink, and they'll blink together.

Because they're both connected to pin 13.

That's what should happen, so let's go and power up.

Let's get our USB cable,

connect the Arduino, power.

And yes, yes indeed, they are blinking together.

As you can see, they both blink together and everything worked.

Thank you.

[MUSIC]

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