51问答网 > 用LED显示高低电平时,为什么要串接一个电阻,该电阻值该如何选择?

用LED显示高低电平时,为什么要串接一个电阻,该电阻值该如何选择?

2025-04-08 01:21:51
推荐回答（1个）
回答1：

由于只是检测显示电平的状态所以LED电流可取5-10mA之间。用高电平电压减去发光二极管压降（一般是1.8V左右）除以0.005就等于电阻值，单位是欧姆。

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