Custom Macropad - Building a Programmable Input Device for Workflow Optimization

This video tutorial walks through the complete process of building a custom macropad to speed up workflow in Fusion 360 and KiCad. Learn how to select components like the Seeed Studio Xiao RP2040 microcontroller, implement a 4x5 button matrix with an I/O expander, integrate rotary encoders, and add RGB LEDs. Follow along with PCB design, assembly using a reflow oven, firmware implementation with QMK, troubleshooting techniques, 3D case design, and programming keyboard shortcuts with Vial. All design files are available on GitHub, making it easy to replicate this project that enhances productivity for engineering software.

Syllabus

00:00 Intro
00:43 What are macropads?
01:33 Design decisions on schematic and board layout
03:34 HID keyboard firmware
05:10 PCB assembly
07:02 Solder reflow oven
08:59 QMK firmware
10:54 Testing all the macropad inputs
12:06 Uh oh! Troubleshooting
14:25 Designing a 3D printed case
17:53 Using Vial to program keyboard shortcuts
19:57 Custom keycaps
20:30 What does the last red button do?