Week 09: Output devices

Kicad Board Design

For this specific task, I decided to create a multicontact due to the lack of pins in my previous PCB designs.

1. I only used pins in the diagram, so I added as many as I needed from the library

2. Then I designed how they would be connected. Due to the number of pins and their intended use, I decided it would be best to create a polygon with two additional sets of pins in the middle.
3. I also added labels to make it easier to identify where the pins should be connected to all the devices.
4. Finally, I added the margin, as seen in previous designs.

5. And to send the cut we first create the trace saving only F.Cu.
6. Then margin saving margin in svg.

MODS archive

For mods, we followed the same process as in past weeks: placed the image of the corresponding traces to cut them on the copper board.

Steps:

• Select measurements from past weeks.
• Apply an offset of 2.
• In the section of the Roland SRM-20 milling machine, set the origins to 0.
• Click "Calculate". Once this is done, an RML document will be generated to be entered into the program.

For cuts only, the process needs to be changed:

• Invert the image.
• Instead of selecting "Mill Tracers," choose "Mill Outline."
• Change the "Tool Diameter" to the diameter of the tool to be used, which is 0.8 in this case.
• Click "Calculate". Create the RML document.

Mods for the trace

Mods for margin

FINAL DESIGNS

These are the images of the final PCBs I'm using. Please note that they are inverted. You can use these images for cutting a PCB instead of using the SVG.

Cutting PCB

Program OLED Display

Is a monochrome (black/white) OLED graphic display with 128 pixels wide and 32 pixels deep. It can be controlled for I2C protocol and a 3.3v.

Arduino

Steps:

1. Install the Libraries: Sketch -> Include Library -> Manage Libraries.
2. Install SSD1306. Install all, including the GFX library.
3. Open the examples to see what you can do with it.

I2C

I2C stands for Inter-Integrated Circuit and is a protocol to communicate with one or more chips. It consists of 2 signals: SDA (Data) and SCL (Serial Clock).

The OLED display works with I2C communication so we need to conect the microcontroller using this exact diagrams

Just like it is shown in the diagram or you can follow this images, due to de complexitie of conection what I can recomend you is to conect each port with a different color , for example all GRD conections in black, all Voltage conections white, SCL pulple ans SCK blue

First example OLED

in hear I conected de OLED uisng SCL y SCK en los demas puertos usando the OLED example in Arduino> Libraries> Examples> OLED examples

What you can do in the OLED display:

• Write text

• Scroll text

• Add fonts

• Draw shapes

• Invert colors

• Display images

• Create your own code

Image creation

We have 2 options:

• Create our own image
• Upload an image from the web

Create animation using reference

1. First I surf the internet looking for an image.

2. Then you can use any platform that you want. I use Photopea and configure the canvas to 128 x 32 pixels.

3. Then painted the little dog using this animation as reference.

You can add more but this animation works with 3 imgs

Once we save the image, we go to a converter from image to byte. I used this one.

If we want to use animations and cut down on programming, we also need to download the library from https://github.com/olikraus/U8g2_Arduino. Follow the example at https://wokwi.com/projects/374294166215201793Or simply copy this code and edit the code where it says Insert code and add the one you get in the page above .

Quick Video Tutorial

This is the diagram that I used to charge the program that you see in this video

So once you have follow this diagram above you can proceed to use the code above or download the archive DOG Animationto follow exactly how it says in the video, dont forget to select the correct microcontrollerand the correct PORT.

Final Results

Files

• Dog Animation code.zip/a>
• FAB PCB
• Xiao Board
• Original PCB interconection
• Neopixelboard