树莓派GPIO使用和测试[0]

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树莓派4b的GPIO是其输入输出模块。

  • 硬件接口

  • 软件环境配置

1）检查python版本

python

2）按python的GPIO库

apt-get install rpi.gpio

检查GPIO

gpio readall

不识别GPIO版本，需要安装wiringPi(http://wiringpi.com/)

wget https://project-downloads.drogon.net/wiringpi-latest.deb
sudo dpkg -i wiringpi-latest.deb

再次检查

gpio readall

pinout

其他常见硬件的pin检查：https://pinout.xyz/boards

  • 软硬件结合测试

1）硬件连接

2）测试代码test2.py

注意此处操作对象按照gpio readall中的name项，另外以下脚本不能再win10下采用text文本存储。

#!/usr/bin/python
## Blinking LED ###################################
import RPi.GPIO as GPIO   ## Import GPIO library
import time               ## Need this for blink delay
GPIO.setmode(GPIO.BOARD)  ## Use board pin numbering
GPIO.setwarnings(False)   ## Disable "Channel already
                          ## in use" warning
led = 7                   ## Variable for pin number
GPIO.setup(led, GPIO.OUT) ## Set pin to output
## Blink the LED 60 times, once per second for 2 minutes
print "Blinking"          ## Blinking in progress
for x in range(0, 59):    ## repeats 60 times
     GPIO.output(led, 1)  ## Turn LED on
     time.sleep(1)        ## Keep it on for 1 second
     GPIO.output(led, 0)  ## Turn LED off
     time.sleep(1)        ## Wait 1 second
GPIO.cleanup()

3）效果：

测试通过

  • linux shell直接控制

注意此处操作对象按照gpio readall中的BCM项

echo 4 > /sys/class/gpio/export  #创建一个可控硬件GPIO7的BCM为4
echo out > /sys/class/gpio/gpio4/direction  控制GPIO4的方向
echo 1 > /sys/class/gpio/gpio4/value  让PIN处于高电压3.3V
echo 0 > /sys/class/gpio/gpio4/value  让PIN处于低电压0V
echo 4 > /sys/class/gpio/unexport  #释放端口

测试通过

  • 补充

安装截图软件，为了使用screenshot截图，需要安装

apt-get scrot

 

参考资料：

  1. http://www.52pi.net/archives/1918
  2. Learning Computer Architecture with Raspberry Pi by Eben Upton, Jeffrey Duntemann 2016 (1st Edition)
  3. https://pinout.xyz/pinout/wiringpi
  4. http://wiringpi.com/download-and-install/
  5. https://www.cnblogs.com/guochaoxxl/p/11728108.html
  6. https://blog.csdn.net/qq_43161960/article/details/108305708