3. Electronics Design
3.1. Idea
This week I learned some PCB design techniques .
As my final project involves a wireless controller. I would like to make a controller pcb to verify my final project idea.
I use LCEDA (pro.lceda.cn) for schematic and PCB design.
3.2 Electronics Design
3.2.1 Componet list
I use ESP32 microcontroller, 0.96-inch OLED display, resistors, LEDs, push buttons, and a 3-pin expansion header. Here is the component list:
| Component | Value/Type | ESP32 Pin Connection |
|---|---|---|
| Button A | 10kΩ | GPIO2 |
| Button B | 10kΩ | GPIO13 |
| LED 1 | — | GPIO26 |
| LED 2 | — | GPIO27 |
| OLED | SCL | GPIO22 |
| OLED | SDA | GPIO21 |
| Extension 1 | — | GPIO18 |
| Extension 2 | — | GPIO19 |
3.2.2 Schematic Design
I use "File ->New -> Project" to create a new project in LCEDA,which containing both schematic and PCB files.
I use "Place -> Device" to select components from the library.
- Select ESP32 Dev Kit (38pin)
- Select OLED
- Select LED
- Select Resistor
- Select 3p pin header
- Select Button
- After select components, I assembly the component according above Componet list:
- I use "Design -> Check DRC" to ensure there were no errors in the schematic.
Such as the following, I meet an error about missing the "No Connect Flag".
I add the "No Connect Flag" to the Button component.
3.2.3 PCB Design
- I use "Place -> Board Outline -> Rectangle" to create a rectangular board outline.
- I use "Design -> import Changes from Schematic" to synchronize PCB layout automatic. I then manually arranged each component—dragging, dropping, and rotating them into optimal positions to ensure clean routing and a well-organized board.
- I use "Route -> Auto Route... " to quickly complete the component routing, requiring only minor adjustments. I then reviewed and verified the routing on both the top and bottom layers. I added the logo and name.
- I use "Place -> Copper Region -> Rectangle" to performed copper pouring.
- I previewed the PCB in 3D to inspect the final design.
3.2.5 Preview
Here is the video of schematic，PCB and 3D preview :
3.2.6 Gerber file
Finally, Iexported the PCB design to Gerber files for manufacturing.