
Seven-Segment Shelves Do Double Duty
The article details the creation of a unique shelving unit that ingeniously integrates a large seven-segment clock, designed by Lewis from DIY Machines. This project arose from Lewis's unsuccessful search for a suitable piece of decor for his living space, leading him to develop a custom solution. The shelving unit not only provides functional storage but also serves as a prominent digital clock, incorporating recessed lighting. The clock functionality is managed by an Elegoo Nano microcontroller, which retrieves time data from a real-time clock module. This information is then displayed using WS2812B LED strips, meticulously arranged to form seven-segment digits. An important feature of the clock is its adaptive brightness, controlled by a photocell module. This sensor detects the ambient light level in the room, ensuring that the LED display adjusts its intensity accordingly, preventing it from being overly bright or too dim for the surrounding environment. The construction of the shelving unit heavily relies on 3D printing technology. Apart from the wooden back panel and the electronic components, the majority of the structure is fabricated from printed plastic. This includes 31 custom-designed supports that form the shelves, as well as specialized holders for the LED strips. Additionally, printed sleeve pieces are used to conceal all the wiring, contributing to the project's clean and finished aesthetic. The design includes a three-digit display, meaning the far-left digit is not a full seven-segment display, as it only needs to show '1' or '2' for a 24-hour format. However, the author notes that adapting the design for a full 24-hour display, which would require an additional shelf, would not be overly complex, especially given the comprehensive build video provided by Lewis. The article concludes by highlighting the impressive nature of such large-scale clock projects, referencing another elaborate blinkenlit clock as an example of similar innovative creations. The project is categorized under Arduino Hacks and Clock Hacks, indicating its reliance on Arduino technology and its function as a time-telling device. The comments section of the article reveals discussions among readers about the choice of materials, particularly the extensive use of plastic. Some readers expressed concern about the long-term stability of plastic, especially PLA, under weight, and suggested alternatives like wood or metal, or combining the LED segments with conventional shelves to reduce plastic use and printing time. Others debated the electronics assembly, specifically the use of terminal blocks versus a custom-designed PCB for better wire management and a more professional finish, with some suggesting Wago connectors as a more practical alternative. There was also a comment regarding the choice of an Elegoo Nano over an ESP8266, which could have enabled NTP for time synchronization. Despite some critical feedback on material choices and electronic implementation details, the overall sentiment expressed by readers acknowledges the project as a neat, cool, and innovative idea.
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