树莓派 GPIO

参考：https://www.raspberrypi.org/documentation/usage/gpio/

1）使用GPIO pinout命令确认板上GPIO配置

　　参考：https://pinout.xyz/

概念补充：

WiringPi

　　控制树莓派GPIO的C代码库

　　WiringPi is a PIN based GPIO access library written in C for the BCM2835, BCM2836 and BCM2837 SoC devices used in all Raspberry Pi. versions.

　　参考：http://wiringpi.com/