看到别人做的 Arduino 的东西,感觉成本都好低呐,说着控制器有多么便宜、插一下线有多么方便。但是自己要做的时候,算起来的花费 就 爆炸了呢……明明是技术含量最高的控制器,却成为价格最低的部件了。电源意外地很贵呢。
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