1000字范文 > 树莓派4B-Python-控制WS2812

树莓派4B-Python-控制WS2812

时间：2022-10-19 20:33:48

本篇文章是使用树莓派4B点亮WS2812灯环，并实现多种颜色的变换。

树莓派4B-Python-控制WS2812B

WS2812参数介绍与工作原理与树莓派4B连接代码可能会出现的问题：

之前心血来潮，在本人那小电风扇上装了一个可控LED灯WS2812，只为了拥有更好的夜晚灯光视觉效果（好吧我承认是有点无聊）。

WS2812

WS2812B是一个集控制电路与发光电路于一体的智能外控LED光源，其外型与一个5050LED灯珠相同，每个元件即为一个像素点。

参数介绍与工作原理

这里本人就不重复说明了，详情请参考以下博客/论坛等，希望对你有所帮助。

参考1

参考2

参考3

参考4

与树莓派4B连接

红色------5V

蓝色------GND

黄色------GPIO18

代码

首先需要安装相关库：

sudo pip install rpi-ws281x

若没有安装pip的还得先安装pip：（装了则跳过此步骤）

sudo apt-get install python-pip

以下为灯光多种变换的代码，一个函数一种变换：

import timefrom rpi_ws281x import PixelStrip, Colorimport argparseLED_COUNT = 16 # LED灯的个数LED_PIN = 18# DI端接GPIO18# 以下可以不用改LED_FREQ_HZ = 800000 # LED signal frequency in hertz (usually 800khz)LED_DMA = 10# DMA channel to use for generating signal (try 10)LED_BRIGHTNESS = 255 # Set to 0 for darkest and 255 for brightestLED_INVERT = False # True to invert the signal (when using NPN transistor level shift)LED_CHANNEL = 0 # set to '1' for GPIOs 13, 19, 41, 45 or 53# 以下为LED模式变换的各个函数def colorWipe(strip, color, wait_ms=20):"""一次擦除显示像素的颜色."""for i in range(strip.numPixels()):strip.setPixelColor(i, color)strip.show()time.sleep(wait_ms / 1000.0)def theaterChase(strip, color, wait_ms=50, iterations=10):"""电影影院灯光风格的追逐动画."""for j in range(iterations):for q in range(3):for i in range(0, strip.numPixels(), 3):strip.setPixelColor(i + q, color)strip.show()time.sleep(wait_ms / 1000.0)for i in range(0, strip.numPixels(), 3):strip.setPixelColor(i + q, 0)def wheel(pos):"""生成横跨0-255个位置的彩虹颜色."""if pos < 85:return Color(pos * 3, 255 - pos * 3, 0)elif pos < 170:pos -= 85return Color(255 - pos * 3, 0, pos * 3)else:pos -= 170return Color(0, pos * 3, 255 - pos * 3)def rainbow(strip, wait_ms=20, iterations=1):"""绘制彩虹，褪色的所有像素一次."""for j in range(256 * iterations):for i in range(strip.numPixels()):strip.setPixelColor(i, wheel((i + j) & 255))strip.show()time.sleep(wait_ms / 1000.0)def rainbowCycle(strip, wait_ms=10, iterations=5):"""画出均匀分布在所有像素上的彩虹."""for j in range(256 * iterations):for i in range(strip.numPixels()):strip.setPixelColor(i, wheel((int(i * 256 / strip.numPixels()) + j) & 255))strip.show()time.sleep(wait_ms / 1000.0)def theaterChaseRainbow(strip, wait_ms=50):"""旋转的彩色灯光."""for j in range(256):for q in range(3):for i in range(0, strip.numPixels(), 3):strip.setPixelColor(i + q, wheel((i + j) % 255))strip.show()time.sleep(wait_ms / 1000.0)for i in range(0, strip.numPixels(), 3):strip.setPixelColor(i + q, 0)# Main program logic follows:if __name__ == '__main__':# Process argumentsparser = argparse.ArgumentParser()parser.add_argument('-c', '--clear', action='store_true', help='clear the display on exit')args = parser.parse_args()# Create NeoPixel object with appropriate configuration.strip = PixelStrip(LED_COUNT, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS, LED_CHANNEL)# Intialize the library (must be called once before other functions).strip.begin()print('Press Ctrl-C to quit.')if not args.clear:print('Use "-c" argument to clear LEDs on exit')try:while True:print('Color wipe animations.')colorWipe(strip, Color(255, 255, 0)) # Red wipecolorWipe(strip, Color(0, 0, 0), 30)colorWipe(strip, Color(0, 255, 255)) # Blue wipecolorWipe(strip, Color(0, 0, 0), 30)colorWipe(strip, Color(255, 0, 255)) # Green wipecolorWipe(strip, Color(0, 0, 0), 30)print('Theater chase animations.')print('Rainbow animations.')rainbow(strip)colorWipe(strip, Color(0, 0, 0), 50)rainbowCycle(strip)colorWipe(strip, Color(0, 0, 0), 40)breakwhile True:rainbowCycle(strip)#print('***********************')colorWipe(strip, Color(0, 0, 0), 100)except:colorWipe(strip, Color(0, 0, 0), 100)