“忙碌板”（busy board）是一种带按钮、开关和 LED 的玩具，用来吸引幼儿注意力；而按钮、开关和 LED 同样能让硬件黑客乐此不疲——尤其当设计者就是黑客本人时。
这个项目的作者 [Andy]（人称 Uncle Andrew）在去年圣诞节为侄子从零打造了一块电子忙碌板。从技术角度看它并不复杂，却是软硬件并重的多学科佳作。他选择现代爱好者的做法，把部分任务交给精心编排的代码来完成。
在分享帖中，Andy 详细讲述了设计与制作时的取舍：为把 PCB 控制在两层板、以及 LED 多路复用的逻辑；软件方面更是深入解释了如何用定时器与中断尽可能高效地驱动整块板子，让 PIC18F67K40 微控制器在三节 AAA 电池下获得最长续航。这是一个低风险的趣味项目，正因为有个人的温度而更显动人。
本文来源：https://hackaday.com/2026/10/02/electronic-busy-board-is-fun-for-kids-and-hackers/
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A 'busy board' is a toy with buttons, switches and LEDs designed to hold a young child's attention; and buttons, switches and LEDs can just as easily keep a hardware hacker hooked — especially when the designer is the hacker.
This project's author [Andy] (known as Uncle Andrew) built an electronic busy board from scratch for his nephew last Christmas. Technically it is not complex, but it is a fine multidisciplinary piece weighing both hardware and software. He took the modern hobbyist approach, handing some of the work off to carefully choreographed code.
In his write-up, Andy details the trade-offs in design and fabrication: keeping the PCB to two layers, and the logic behind LED multiplexing. On the software side he goes deeper into how timers and interrupts drive the whole board as efficiently as possible, getting the longest runtime from three AAA batteries on a PIC18F67K40 microcontroller. It is a low-risk fun project, and all the more appealing for having personal warmth.
