树莓派【二、RGB_LED灯实验】

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八戒无戒i

最新推荐文章于 2025-03-22 21:21:23 发布

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分类专栏：树莓派

本文链接：https://blog.youkuaiyun.com/weixin_43563447/article/details/118469543

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本文介绍了如何使用树莓派的GPIO口控制RGB灯，通过BOARD编码连接R、G、B和GND引脚。实验代码展示了如何初始化GPIO，设置PWM信号，并实现RGB灯的闪烁和颜色随机变化。通过`RGBLED`类，实现了对RGB灯的控制，包括设置占空比和频率。在运行代码后，RGB灯会根据设定闪烁和变化颜色。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

1、接线图

本实验中均采用物理引脚，即BOARD编码，RGB灯如下图从左到右分别为R、G、B和GND引脚，树莓派GPIO口选择34、36、38、40，由接线图可以得到：
34pin -> RGB灯[GND]
36pin -> RGB灯[R]
38pin -> RGB灯[G]
40pin -> RGB灯[B]

在这里插入图片描述

实物图（多余的线不用关注，只关注和接线原理图对应的线即可）：

二、实验代码

# -*- coding: utf-8 -*-
# __projectName__           : Pi
# __fileUnit__              : hello.py
# __owner__                 : bingo
# __data__                  : 2021/7/2
# __time__                  : 19:26
# ++++++++++++++ Please start your code from here +++++++++++++++++
import RPi.GPIO as gpio
import time
import random


class RGBLED(object):
    """
     +-----+-----+---------+------+---+---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 | 0 | IN   | 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 | 1 | IN   | GPIO.28 | 28  | 20  |
     |     |     |      0v