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System Integration

Individual Assignments

  • Design and document the system integration for your final project

Have you answered these questions?

  • implemented methods of packaging?
  • designed your final project to look like a finished product?
  • documented system integration of your final project?
  • linked to your system integration documentation from your final project page?

PC working environment

  • PC: MacBook Pro(16-inch,2019)
  • OS: Sonoma 14.7.2
  • Terminal: zsh

hero shot

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System diagram

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Board

It took several tries, but the final form is as follows.

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To minimize wiring as much as possible, we designed the OLED Display and DFolayer to be mounted directly on the substrate.

Sender side

  • Schematic alt text

  • pcb alt text

In this case, the power supply is taken from the back side of the microcontroller, so I drilled a hole for that purpose.

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This time I tried reflow soldering! The hole I made was too small for the soldering iron to fit through, so I shaved the cut end at a slight angle.

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Paste solder into this hole and melt it by applying an iron.

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I experimented to see if it is possible to connect and charge the lithium-ion polymer actually used.

The data sheet described the following

  • When XIAO ESP32S3 is not connected to the battery, the red light comes on when the Type-C cable is connected and goes off after 30 seconds.
  • The red light flashes when the battery is connected and the Type-C cable is connected for charging.
  • When connecting Type-C to charge the battery fully, the red light turns off.

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The red light is blinking like this, which indicates successful charging!

Receiver side

  • Schematic alt text

  • pcb alt text

Originally, DFplayer was connected to the board with wires, but to reduce wiring, it can be mounted on the board.

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case

Sender side

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I redesigned it several times. It was very difficult to not only make sure that all the parts would fit, but also to take into consideration how they would be assembled and when they would be installed.
In the end, I used acrylic, which is faster to process than a 3D printer, transparent, and desirable looking.

Initially, I designed it as a 3D-printed pillar-like object with inserts to be screwed down.
However, this is not very pleasing to the eye. So I decided to shorten it so that the side part can be removed, and then glue the rest with acrylic sundae.

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The production process is as follows

  • design (Fusion360)

I briefly assembled the acrylic to account for the overlap before designing it in Fusion360. alt text

top panel alt text

bottom panel alt text

wall panel 1 alt text

wall panel 2 alt text

Variable resistor mounting panel alt text

LiPo battery panel alt text

  • Reinforcement part

mounting feet alt text alt text

  • assembly

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An insert was added to the finished product to allow the lid to be screwed on later.

  • cutting

In this case, a laser processing machine was used. alt text

  • assembly

The parts other than the part to be the lid were glued using acryl sundae. alt text alt text

  • completion alt text

Receiver side

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  • design (Fusion360)

top panel alt text

bottom panel alt text

speaker and OLED display panel alt text

wall panel 1 alt text

wall panel 2(LiPo buttery side) alt text

wall panel3 alt text

wall panel4 alt text

  • Reinforcement part

mounting feet 1 alt text

mounting feet 2 alt text

mounting feet 3 alt text

  • assembly alt text

  • cutting

  • assembly alt text

  • completion alt text

※This picture is still a try1 board.

Design files

Sender side case

Receiver side case

impressions

  • I found laser processing to be more productive than 3D printing, with faster processing times.
  • It was very difficult to design from scratch by myself. I had to think about the size and position of the parts to be incorporated, as well as how they would be assembled.
  • A lot of wiring lines would look dirty because the case is transparent... I thought how to make the wiring look smart was one of the most important parts of the appearance.

optional task

The instructor asked me to put together another set of instructions on how to use the new laser cutter. See 15-2.Laser cutter xToolPS2 for details.