Articles taggedElectronics

A walkthrough of ordering two PCBs designed in KiCad from JLCPCB, covering generating and uploading the order files, choosing manufacturing options and a stencil, replying in English to a post-order confirmation email, payment methods and actual cost, and the delivery timeline.

The left click on my Logitech MX Ergo S trackball started double-clicking, so I repaired it by replacing the tact switches. This post records the tools needed for disassembly, how to choose the right switch, removing the main board, and the desoldering and soldering steps, plus the differences from the older MX Ergo and pitfalls when buying parts.

A walkthrough of M5StackChan setup, covering unboxing, smartphone pairing, Wi‑Fi configuration, AI conversations, and Avatar mode using the stock firmware.

Driving a WS2812B (NeoPixel) RGB LED from a CH32V003 using SPI and DMA, reusing the ch32fun driver header in a MounRiver Studio Ⅱ project. Covers wiring, the two register-name fixes for the official SDK, and a sample that cycles through six colors.

Generate a 50 Hz PWM signal with TIM1 on the CH32V003 microcontroller using the official SDK in MounRiver Studio Ⅱ and drive an RC servo motor (MG90D), with reusable servo.h/servo.c code and oscilloscope verification of the 1.5 ms pulse.

Setting up the CH32V003, a low-cost RISC-V microcontroller, in the VSCode-based MounRiver Studio Ⅱ: installing the IDE, creating a project, wiring a test circuit with the WCH-LinkE, enabling SDI printf debugging, and blinking an LED.