使用树莓派控制led灯板 ws2812

使用树莓派控制led灯板ws2812

推荐一个库 Adafruit_NeoPixel

这里是地址：https://github.com/adafruit/Adafruit_NeoPixel

这个原本是在Arduino上控制led的库
github上的介绍：

Arduino library for controlling single-wire-based LED pixels and strip such as the Adafruit 60 LED/meter Digital LED strip, the Adafruit FLORA RGB Smart Pixel, the Adafruit Breadboard-friendly RGB Smart Pixel, the Adafruit NeoPixel Stick, and the Adafruit NeoPixel Shield.

After downloading, rename folder to ‘Adafruit_NeoPixel’ and install in Arduino Libraries folder. Restart Arduino IDE, then open File->Sketchbook->Library->Adafruit_NeoPixel->strandtest sketch.

Compatibility notes: Port A is not supported on any AVR processors at this time

Supported chipsets
We have included code for the following chips - sometimes these break for exciting reasons that we can’t control in which case please open an issue!

AVR ATmega and ATtiny (any 8-bit) - 8 MHz, 12 MHz and 16 MHz
Teensy 3.x and LC
Arduino Due
Arduino 101
ATSAMD21 (Arduino Zero/M0 and other SAMD21 boards) @ 48 MHz
ATSAMD51 @ 120 MHz
Adafruit STM32 Feather @ 120 MHz
ESP8266 any speed
ESP32 any speed
Nordic nRF52 (Adafruit Feather nRF52), nRF51 (micro:bit)
Check forks for other architectures not listed here!

用在树莓派(python)上面也是一样的：

[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-skmaMHBm-1603779810385)(https://cdn-learn.adafruit.com/assets/assets/000/063/650/medium800/leds_NeoPixel_Single_LED_Red.jpg?1539811956)]
[外链图片转存失败,源站可能有防盗链机制,建议将图片保存下来直接上传(img-peSFGw36-1603779810398)(https://cdn-learn.adafruit.com/assets/assets/000/063/651/medium800/leds_NeoPixel_All_LEDs_Green.jpg?1539811967)]

下面是我做的成品地址:https://www.bilibili.com/video/av47393296

欢迎来讨论

下面是代码哦：

import time
import board
import neopixel

pixel_pin = board.D18  #定义针脚
num_pixels = 30 #定义LED个数
ORDER = neopixel.GRB

pixels = neopixel.NeoPixel(pixel_pin, num_pixels, brightness=0.2, auto_write=False,
                           pixel_order=ORDER)


def wheel(pos):
    # Input a value 0 to 255 to get a color value.
    # The colours are a transition r - g - b - back to r.
    if pos < 0 or pos > 255:
        r = g = b = 0
    elif pos < 85:
        r = int(pos * 3)
        g = int(255 - pos*3)
        b = 0
    elif pos < 170:
        pos -= 85
        r = int(255 - pos*3)
        g = 0
        b = int(pos*3)
    else:
        pos -= 170
        r = 0
        g = int(pos*3)
        b = int(255 - pos*3)
    return (r, g, b) if ORDER == neopixel.RGB or ORDER == neopixel.GRB else (r, g, b, 0)


def rainbow_cycle(wait):
    for j in range(255):
        for i in range(num_pixels):
            pixel_index = (i * 256 // num_pixels) + j
            pixels[i] = wheel(pixel_index & 255)
        pixels.show()
        time.sleep(wait)


while True:
    
    pixels.fill((255, 0, 0))
    pixels.show()
    time.sleep(1)
    pixels.fill((0, 255, 0))
    pixels.show()
    time.sleep(1)
    pixels.fill((0, 0, 255))
    pixels.show()
    time.sleep(1)
    rainbow_cycle(0.001)