Archives

This guide explains setting up a self-hosted domain email server using Poste.io with Docker on Linux. It covers domain registration, server prerequisites (notably port 25), DNS configuration (A, MX, SPF, DKIM), installation via Docker, SSL certificate issuance, and account management. Readers gain a professional, customizable email service with unlimited sending/receiving, multi-domain support, and robust security features.

This article shares casual photos of 2024 sunsets, evening glow, and sunrises captured with a Huawei Pura70Pro+. The images were taken at home and at Double-Moon Bay in Huizhou, all compressed, offering viewers a glimpse of natural scenery.

AkileCloud's UK Lite2 cloud server offers native UK IP, AMD R9 7900 CPU, and 500Mbps bandwidth from ¥19.99/month. Benchmarks show strong single-core performance, with Geekbench 5 score 1831 and download speeds up to 475Mbps. Average latency to China is 249.3ms, with mixed routing across telecom, unicom, and mobile networks.

The article introduces httpsok, a free SSL certificate application and auto-deployment platform supporting wildcard domains from ZeroSSL, Let's Encrypt, and Google. It enables one-command issuance, renewal, and deployment to CDN/OSS providers, plus certificate monitoring. The text also explains SSL certificate functions, types, and the application process, offering benefits like automated management and free quotas. An alternative service, OHTTPS, is also mentioned.

The article reviews the EastTester ET4410 LCR meter, purchased for 1,199 yuan. It outlines key specifications, including 10Hz-100kHz frequency, 0.2% basic accuracy, DCR and electrolytic capacitor modes, TFT display, and calibration functions. Practical tests show accurate measurements for resistors, capacitors, and inductors, though low-resistance readings are limited. A list sweep mode bug is identified, with a firmware update provided. Readers gain cost-performance insights, usage guidance, and awareness of measurement limitations when choosing this instrument.

Article presents porting LVGL to STM32F407 with a 3.5-inch MSP3526 LCD (ST7796, FT6336U) using SPI+DMA, providing FreeRTOS and bare-metal project versions. It covers wiring, performance figures (~9 FPS full-screen, >30 FPS partial after overclocking), code examples, and download resources, helping readers implement embedded GUI displays effectively.

This article presents a complete STM32G474 HAL library driver for 0.96-inch SSD1306 OLED displays with 4-pin I2C interface, supporting both hardware and software I2C via simple macro configuration. It enables displaying English, integers, floating-point numbers, Chinese characters, images, binary and hex values, plus drawing points, lines, rectangles, circles, ellipses, and triangles with multiple fonts. Step-by-step STM32CubeMX setup instructions for both I2C modes are included, making integration straightforward.

This article presents an open-source four-switch Buck-Boost digital power supply based on STM32G474, supporting Type-C PD and DC input up to 48V10A and 450W. It includes schematic, PCB, firmware, and 3D model files. The design offers adjustable output, OLED display, protections, and host monitoring, achieving up to 94.3% efficiency and low ripple. Users can access calculations and source code.