树莓派与普通电脑最大的区别也就是GPIO了,在本篇树莓派python gpio编程教程中,我将介绍GPIO引脚的所有基础知识,以及怎么用python编程控制GPIO。
一、创建环境
新建PythonWorkSpace文件夹新建gpio_out.py文件
pi@raspberrypi:~ $ mkdir PythonWorkSpace
pi@raspberrypi:~ $ cd PythonWorkSpace/
pi@raspberrypi:~/PythonWorkSpace $ vim gpio_out.py
二、编写代码
编辑gpio_out.py
import RPi.GPIO as GPIO
import time
PIN = 12
GPIO.setmode(GPIO.BOARD)
GPIO.setup(PIN, GPIO.OUT)
GPIO.output(PIN, GPIO.HIGH)
for num in range(0, 10):
print "gpio out :", num
GPIO.output(PIN, num%2)
time.sleep(3)
GPIO.cleanup()
print("gpio out end\r\n")
三、运行代码
Python是脚本语言,不需要编译,可以直接运行
运行py
pi@raspberrypi:~/PythonWorkSpace $ python gpio_out.py
gpio out : 0
gpio out : 1
gpio out : 2
gpio out : 3
gpio out : 4
gpio out : 5
gpio out : 6
gpio out : 7
gpio out : 8
gpio out : 9
gpio out end
pi@raspberrypi:~/PythonWorkSpace $
四、查看效果
用万用表量下编号12的GPIO.1的引脚,可以发现其间隔3s的闪烁10次。
手边如果一时半会找不到树莓派的GPIO引脚图
可以通过gpio readall查看
pi@raspberrypi:~/PythonWorkSpace $ gpio readall
+-----+-----+---------+------+---+---Pi 3B--+---+------+---------+-----+-----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
| | | 3.3v | | | 1 || 2 | | | 5v | | |
| 2 | 8 | SDA.1 | IN | 1 | 3 || 4 | | | 5v | | |
| 3 | 9 | SCL.1 | IN | 1 | 5 || 6 | | | 0v | | |
| 4 | 7 | GPIO. 7 | IN | 1 | 7 || 8 | 0 | IN | TxD | 15 | 14 |
| | | 0v | | | 9 || 10 | 1 | IN | RxD | 16 | 15 |
| 17 | 0 | GPIO. 0 | IN | 0 | 11 || 12 | 1 | OUT | GPIO. 1 | 1 | 18 |
| 27 | 2 | GPIO. 2 | IN | 0 | 13 || 14 | | | 0v | | |
| 22 | 3 | GPIO. 3 | IN | 0 | 15 || 16 | 0 | IN | GPIO. 4 | 4 | 23 |
| | | 3.3v | | | 17 || 18 | 0 | IN | GPIO. 5 | 5 | 24 |
| 10 | 12 | MOSI | IN | 0 | 19 || 20 | | | 0v | | |
| 9 | 13 | MISO | IN | 0 | 21 || 22 | 0 | IN | GPIO. 6 | 6 | 25 |
| 11 | 14 | SCLK | IN | 0 | 23 || 24 | 1 | IN | CE0 | 10 | 8 |
| | | 0v | | | 25 || 26 | 1 | IN | CE1 | 11 | 7 |
| 0 | 30 | SDA.0 | IN | 1 | 27 || 28 | 1 | IN | SCL.0 | 31 | 1 |
| 5 | 21 | GPIO.21 | IN | 1 | 29 || 30 | | | 0v | | |
| 6 | 22 | GPIO.22 | IN | 1 | 31 || 32 | 0 | IN | GPIO.26 | 26 | 12 |
| 13 | 23 | GPIO.23 | IN | 0 | 33 || 34 | | | 0v | | |
| 19 | 24 | GPIO.24 | IN | 0 | 35 || 36 | 0 | IN | GPIO.27 | 27 | 16 |
| 26 | 25 | GPIO.25 | IN | 0 | 37 || 38 | 0 | IN | GPIO.28 | 28 | 20 |
| | | 0v | | | 39 || 40 | 0 | IN | GPIO.29 | 29 | 21 |
+-----+-----+---------+------+---+----++----+---+------+---------+-----+-----+
| BCM | wPi | Name | Mode | V | Physical | V | Mode | Name | wPi | BCM |
+-----+-----+---------+------+---+---Pi 3B--+---+------+---------+-----+-----+
五、RPi.GPIO模块简单介绍
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