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发表于 2014-1-29 10:56:41
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本帖最后由 leicheng 于 2014-1-29 11:27 编辑
wing 发表于 2014-1-29 10:36 
情况是这样的,当时这个实验是用9v给nano供电的,整个电路只有这一个电源,
345是接nano的+5v针脚,
而cc25 ...
官网上有这样一句话,令人觉得Nano只有通过USB连接时才会有3.3V的输出:The FTDI FT232RL chip on the Nano is only powered if the board is being powered over USB. As a result, when running on external (non-USB) power, the 3.3V output (which is supplied by the FTDI chip) is not available.
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