THE all-on-one-pin interface solution we explored last month allowed us to add a (calculator) keypad to our original display design, which was first used for a 24-hour clock. Now we're ready to program the hardware to turn it into a calculator.While the additional modifications to the hardware were minimal, the software will not be as trivial. As we add functionality to the code, it's good to take a step back and consider the current behaviour of the code before changes are made.
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机译：上个月我们探索的全针脚界面解决方案使我们能够在原始显示设计中添加一个（计算器）键盘，该键盘最初用于24小时制。现在，我们准备对硬件进行编程，以将其转换为计算器。 r n尽管对硬件的其他修改很少，但是软件将不那么琐碎。当我们向代码添加功能时，最好退后一步，在进行更改之前考虑代码的当前行为。
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