一名开发者通过创意硬件组装和软件定制，将成本不足20美元的4G无线热点改造成专用短信设备1。这套系统整合了Clicks键盘和夏普显示屏，通过自设计的电路板、Linux系统定制和驱动开发，实现了功能完整的便携通讯终端1。
项目的技术核心包括多个环节1。开发者采用openstick项目将设备从Android刷入Linux系统1，随后设计PCB电路板以处理USB主机模式供电、模式切换、显示供电和信号转换等问题1。在驱动层面，项目使用了ardangelo's sharp-drm-driver作为DRM显示驱动1，并通过gpioset和libgpiod工具测试GPIO和SPI引脚1。为改善黑白显示效果，开发者还添加了自定义dithering算法支持，包括Ordered、Floyd-Steinberg和Bayer等多种模式1。
尽管项目已可运行，但仍存在待解决的问题1。休眠功能、电源按钮缺陷和显示驱动内存泄漏是当前主要挑战1。设备最终采用3D打印和热熔胶进行封装，尺寸经过优化以适配Clicks键盘外壳1。
A developer has successfully converted a $20 4G wireless hotspot into a dedicated texting device through custom hardware modifications and Linux software engineering.1 The project leverages a Clicks keyboard and Sharp display screen alongside the budget-friendly hotspot as its core components.1
The build process involved flashing the device with Linux using the openstick project, replacing its original Android operating system.1 A custom PCB was designed to handle USB host mode power delivery, mode switching, display power management, and signal conversion between components.1 The developer tested GPIO and SPI pins using gpioset and libgpiod before implementing the Sharp DRM display driver from ardangelo's sharp-drm-driver project.1 Key technical challenges included maintaining USB high-speed bus connectivity, managing manual CS pin control, and ensuring SPI signal integrity.1
To improve the black and white display rendering, the developer implemented custom dithering algorithms supporting Ordered, Floyd-Steinberg, and Bayer methods.1 The final assembly used 3D printing and hot glue for enclosure, with dimensions tailored to fit within the Clicks keyboard housing.1 However, several issues remain unresolved, including sleep functionality, a malfunctioning power button, and memory leaks in the display driver.1
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