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Matrix Customization

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Matrix Customization

It was amazing when we turned our first LED on. What if we told you one was just the beginning! In this Module we will manipulate 8x8 LED matrices to execute a variety of custom schemes. We will program and build games, and digital displays that can be used for fun or business. The 8x8 LED matrix is just the beginning. Our code and ultimately our concepts can be applied to larger more intricate projects as you grow your IoT toolbox.

Have you wondered how information from physical devices in the real world gets communicated to Smartphone processors? Do you want to make informed design decisions about sampling frequencies and bit-width requirements for various kinds of sensors? Do you want to gain expertise to affect the real world with actuators such as stepper motors, LEDs and generate notifications? In this course, you will learn to interface common sensors and actuators to the DragonBoard™ 410c hardware. You will then develop software to acquire sensory data, process the data and actuate stepper motors, LEDs, etc. for use in mobile-enabled products. Along the way, you’ll learn to apply both analog-to-digital and digital-to-analog conversion concepts. Learning Goals: After completing this course, you will be able to: 1. Estimate sampling frequency and bit-width required for different sensors. 2. Program GPIOs (general purpose input/output pins) to enable communication between the DragonBoard 410c and common sensors. 3. Write data acquisition code for sensors such as passive and active infrared (IR) sensors, microphones, cameras, GPS, accelerometers, ultrasonic sensors, etc. 4. Write applications that process sensor data and take specific actions, such as stepper motors, LED matrices for digital signage and gaming, etc.

Impartido por:

Ganz Chockalingam
Principal Engineer
Harinath Garudadri
Associate Research Scientist

Transcripción

All right, so we wanted to talk to you about a quick couple of things that you

can do to kind of customize the LED matrix,

as well as being able to add on additional blocks.

So, the way we wrote the code is it's set up so

you can have multiple LED matrices connected in series.

And so what you would actually do is take your, well,

we would be using three GPIOs for this.

And so you have one connected to DIN, one connected CS, and one connected to CLK.

And then you have VCC powered and GND.

And then if you look the other side of the PCB,

there's actually VCC, GND, DOUT, CS, and CLK.

And so those five would actually be connected to the next LED matrix, and so

the DOUT would be connected to the DIN of another one.

And so you can actually shift in instructions to multiple LED blocks, and

we'll actually have a demo for that, so it looks really cool.

But now they can't handle more than eight blocks because of power constraints, so

it can only travel through eight of them before it gets too low that you won't be

able to turn them on.

But still, having eight of them set up together,

you can do some really cool stuff with it.

We also wanted to talk about the scan limit, and so

you can set the scan limit by putting in the proper op-code.

And I believe the scan limit can go from zero to seven, and

you're basically telling the matrix how many columns you want to read.

And so if you, for example, set the scan limit to like,

normally you just have it set to seven, so it'll read all eight of the columns.

But if you set it down to a lower number,

you actually won't be able to read some of the larger numbered columns.

And so you can do this to save power, if you only wanna use like half the matrix,

or something like that.

And talking about saving power,

you can also do that by adjusting the LED intensity.

So if you wanted them to be really bright, you can set them,

I think it goes up to 15, is the maximum intensity.

And then it just scales down to zero, I believe,

which would be the off, so they won't turn on [LAUGH].

>> Well, speaking of off [LAUGH], shutdown mode is basically a mode

that you can put the LED block in so that none of the LEDs can be changed.

And then you have a display test where, this isn't actually so much customization

I wouldn't say, but just something that's available to you with the block.

And so, yeah, so you can make it so that the LEDs can't be changed.

You can also perform a display test which turns on all the LEDs at the same time.

Just basically ensuring you that all of your LEDs are working,

making sure everything's functioning properly, opening up doors for

you to start programming and creating fun custom demos [LAUGH], so yeah.

>> We spent a lot of work creating those fun custom demos,

so you better enjoy them.

>> Yeah, we're gonna show you some of them, and

then they're also gonna be made available to you so

you'll be able to run them yourself.

You'll be able to see them right here.

And then you can basically use the code, mimic some of the code, and

make your own cool demos, show off to your friends.

All right, so we're gonna probably get into the code really soon I think.

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