无法使用计算机作为电源使用 RPi 3 GPIO
Can't use RPi 3 GPIO using computer as power supply
我有一个 raspberry pi 3，我直接用我的电脑供电，我不能使用 GPIO 引脚，因为它们不发送任何东西。
我真的需要电源吗？
是的，您绝对应该使用 "real" 电源，如此处所述：Raspberry Pi, Powers supply
如果您使用任何 USB 端口或移动 phone 充电器，可能会发生某些功能无法使用的情况，因为电源 and/or 电压不足。
具体规格如下：FAQ - Power requirements
引自常见问题解答：
2. CAN I POWER THE RASPBERRY PI FROM A USB HUB?
"It depends on the hub. Some hubs comply with the USB 2.0 Standard and only provide 500mA per port, which may not be enough to power your Raspberry Pi. Other hubs view the USB standards more like guidelines, and will provide as much power as you want from each port. Please also be aware that some hubs have been known to “backfeed” the Raspberry Pi. This means that the hubs will power the Raspberry Pi through its USB input cable, without the need for a separate micro-USB power cable, and bypass the voltage protection. If you are using a hub that “backfeeds” to the Raspberry Pi and the hub experiences a power surge, your Raspberry Pi could potentially be damaged."
我有一个 raspberry pi 3，我直接用我的电脑供电，我不能使用 GPIO 引脚，因为它们不发送任何东西。
我真的需要电源吗？
是的，您绝对应该使用 "real" 电源，如此处所述：Raspberry Pi, Powers supply 如果您使用任何 USB 端口或移动 phone 充电器，可能会发生某些功能无法使用的情况，因为电源 and/or 电压不足。
具体规格如下：FAQ - Power requirements
引自常见问题解答：
2. CAN I POWER THE RASPBERRY PI FROM A USB HUB?
"It depends on the hub. Some hubs comply with the USB 2.0 Standard and only provide 500mA per port, which may not be enough to power your Raspberry Pi. Other hubs view the USB standards more like guidelines, and will provide as much power as you want from each port. Please also be aware that some hubs have been known to “backfeed” the Raspberry Pi. This means that the hubs will power the Raspberry Pi through its USB input cable, without the need for a separate micro-USB power cable, and bypass the voltage protection. If you are using a hub that “backfeeds” to the Raspberry Pi and the hub experiences a power surge, your Raspberry Pi could potentially be damaged."