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
System diagram
Board
It took several tries, but the final form is as follows.
To minimize wiring as much as possible, we designed the OLED Display and DFolayer to be mounted directly on the substrate.
Sender side
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Schematic
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pcb
In this case, the power supply is taken from the back side of the microcontroller, so I drilled a hole for that purpose.
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.
Paste solder into this hole and melt it by applying an iron.
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.
The red light is blinking like this, which indicates successful charging!
Receiver side
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Schematic
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pcb
Originally, DFplayer was connected to the board with wires, but to reduce wiring, it can be mounted on the board.
case
Sender side
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.
The production process is as follows
- design (Fusion360)
I briefly assembled the acrylic to account for the overlap before designing it in Fusion360.
top panel
bottom panel
wall panel 1
wall panel 2
Variable resistor mounting panel
LiPo battery panel
- Reinforcement part
mounting feet
- assembly
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.
- assembly
The parts other than the part to be the lid were glued using acryl sundae.
- completion
Receiver side
- design (Fusion360)
top panel
bottom panel
speaker and OLED display panel
wall panel 1
wall panel 2(LiPo buttery side)
wall panel3
wall panel4
- Reinforcement part
mounting feet 1
mounting feet 2
mounting feet 3
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assembly
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cutting
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assembly
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completion
※This picture is still a try1 board.
Design files
- Sender side (Kicad)
- Receiver side (Kicad)
Sender side case
- top panel (f3d)
- bottom panel (f3d)
- wall panel 1 (f3d)
- wall panel 2 (f3d)
- Variable resistor mounting panel (f3d)
- Install LiPo battery panel (f3d)
- mounting feet (f3d)
Receiver side case
- top panel (f3d)
- bottom panel (f3d)
- speaker and OLED display panel (f3d)
- wall panel 1 (f3d)
- wall panel 2(LiPo buttery side) (f3d)
- wall panel3 (f3d)
- wall panel4 (f3d)
- mounting feet 1 (f3d)
- mounting feet 2 (f3d)
- mounting feet 3 (f3d)
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.