KiCad-RP-Pico Project: 3D Footprint for Raspberry Pi Pico in KiCad

12 Nov, 2024

Are you a KiCad enthusiast working with the Raspberry Pi Pico board? If so, you might have noticed the absence of a proper 3D footprint for this popular microcontroller in your PCB designs. That's where KiCad-RP-Pico comes in—a simple but invaluable project that adds a detailed 3D model of the Raspberry Pi Pico board to your KiCad library, elevating your design experience with enhanced visualization. Let's dive into what this project offers and why it might be a game-changer for your next PCB project.

What is KiCad-RP-Pico?

KiCad-RP-Pico is a repository that includes all the essential files needed to add a complete 3D footprint of the Raspberry Pi Pico to your KiCad project. This addition brings the Raspberry Pi Pico board to life in KiCad's 3D viewer, allowing you to see how the module will fit and look on your custom PCB. The project’s aim is straightforward: to provide an accurate and visual representation of the Raspberry Pi Pico board within KiCad, which was previously missing in many available libraries.

Origin of the Project

The repository is based on files initially provided by the HeadBoffin RP_Silicon_KiCad project. However, users faced challenges due to errors in the original instructions for retrieving necessary files from the Raspberry Pi website. To solve this, the KiCad-RP-Pico project consolidates everything you need in a single place, making it easier for users to access and integrate the Raspberry Pi Pico schema and footprint without confusion.

Key Features

1. Complete 3D Model of the Raspberry Pi Pico

One of the standout features of KiCad-RP-Pico is the addition of a 3D model for the Raspberry Pi Pico. The model was meticulously created using SketchUp, based on the official mechanical specifications from the Raspberry Pi Pico datasheet. The 3D file is provided in VRML (Pico.wrl) format, compatible with KiCad’s 3D viewer. This enhancement enables users to see a realistic representation of the Pico board when designing PCBs.

Why This Matters: In PCB design, having a 3D visual can help you ensure that components fit together correctly, avoiding potential issues during the manufacturing process. It’s also useful for presenting your designs to clients or stakeholders in a more polished and professional manner.

2. Improved Schematic and Footprint Files

The project offers updated schematic and footprint files, correcting some errors found in the original HeadBoffin library. These files are stored in the RP-Pico Libraries folder within the repository. The updated footprint includes accurate dimensions and pin placements, reflecting the castellated pins of the Raspberry Pi Pico board, which can be used as a surface mount module.

3. Enhanced User Experience with Installation Guide

Integrating a new footprint library can sometimes be daunting, but KiCad-RP-Pico simplifies the process with a clear installation guide. It walks you through adding the Raspberry Pi Pico schema and 3D model to your KiCad project step by step. This user-friendly approach ensures that even those new to KiCad can easily enhance their projects with the Pico board.

Performance and Usability

Rasperry Pi Pico 3D Asset - SketchUp File

A noteworthy mention is the project’s emphasis on usability, especially when it comes to loading the 3D viewer. The creator of KiCad-RP-Pico acknowledges that the 3D model might slow down KiCad’s performance on older systems, particularly when opening the 3D viewer for the first time. However, this is mitigated by the ability to enable or disable the 3D visual file as needed, striking a balance between enhanced visualization and efficient workflow.

Tip: If you experience delays when loading the 3D viewer, consider disabling the 3D model while you are actively designing, and only enable it when you need a final visualization.

Test Project Included

To help users get started, the repository includes a test project, showcasing a simple usage example of the Raspberry Pi Pico 3D footprint. This example serves as a practical reference, demonstrating how the model looks and behaves within a real KiCad project. For newcomers, this test project is an excellent resource to learn how to integrate and utilize the Raspberry Pi Pico 3D model effectively.

Potential Use Cases

Prototyping: The KiCad-RP-Pico footprint is perfect for rapid prototyping, where accurate visual representation of components can help in early-stage validation.
Client Presentations: The 3D model can be used to showcase your designs in a more engaging and realistic manner, making it easier for clients to visualize the end product.
Educational Projects: For students and educators, having a detailed 3D model in KiCad can enhance learning and provide a more comprehensive understanding of PCB design.

Room for Improvement

While the project delivers a great solution, there are a couple of minor areas that could be enhanced:

Load Time Optimization: Although the option to disable the 3D model helps, further optimizations to the VRML file could potentially reduce initial load times.
Additional Board Variants: Currently, the 3D model is based on the standard Raspberry Pi Pico specifications. Future updates could include variants like the Pico W, catering to a broader range of users.

Final Verdict

The KiCad-RP-Pico project fills a significant gap for KiCad users who work with the Raspberry Pi Pico. By providing a detailed 3D footprint, it enhances the design experience, making it easier to visualize and validate PCB layouts. The project is well-organized, user-friendly, and backed by a clear installation guide, making it accessible even for beginners.

If you are designing PCBs with the Raspberry Pi Pico in KiCad, this repository is a must-have addition to your library. It simplifies the process, offers improved visuals, and helps you create more accurate and professional-looking projects. Give it a try—you won’t be disappointed!