Update instro.md

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呓喵酱 5 years ago committed by GitHub
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### 译码器连法
> 译码器与显示器连法(由[番茄树](https://tomatotrees.xyz)同学提供)
- 推荐使用**D9,D10,D11,D12分别连接右边译码器的A,B,C,D**
- 推荐使用**D5,D6,D7,D8分别接左边译码器A,B,C,D**
![Circuit of dicoder and screen](https://cloud.yimian.xyz/package/iotcat/digital-clock/pic/circuit-for-decoder.png)

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