树莓派-Pico控制WS2812

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前言（制作缘由）

• 前段时间给家里设计了一款床头灯哈，那为啥自己设计呢？
  -因为想省钱。看上的那些带有设计感的床头灯较贵，买两个下来得两三百，看着就心疼。
• 自己设计有啥好处呢？
  -很简单，就是造型全凭自己模仿与想象，可以做成自己想要的样子。
• 那又为啥用到了WS2812呢？
  -既然是控制灯的，那就来点小花样呗，常规的线条LED灯带改为了WS2812灯带，主打的就是灯光效果、颜色、启动特效可自定义。

于是呢，总共的费用也是达到了200+（\哭笑）
玩玩而已，开心就好~

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一、有啥设计方案？

二、选择的方案

设计了好几个方案，最终选择了最后一种，原因就是几个方案相对来说省点钱，并且不用走明线，直接挡住出线孔就行。

三、效果图

四、树莓派-Pico控制WS2812的代码

提示：
以下代码的效果呢是一直循环随机变换颜色和亮灯模式的。

WS2812接板子上的5V和GND，控制端接GPIO0。

# Example using PIO to drive a set of WS2812 LEDs.import array, time, random
from machine import Pin
import rp2# Configure the number of WS2812 LEDs.
NUM_LEDS = 57
PIN_NUM = 0
brightness = 0.5@rp2.asm_pio(sideset_init=rp2.PIO.OUT_LOW, out_shiftdir=rp2.PIO.SHIFT_LEFT, autopull=True, pull_thresh=24)
def ws2812():T1 = 2T2 = 5T3 = 3wrap_target()label("bitloop")out(x, 1).side(0)[T3 - 1]jmp(not_x, "do_zero").side(1)[T1 - 1]jmp("bitloop").side(1)[T2 - 1]label("do_zero")nop().side(0)[T2 - 1]wrap()# Create the StateMachine with the ws2812 program, outputting on pin
sm = rp2.StateMachine(0, ws2812, freq=8_000_000, sideset_base=Pin(PIN_NUM))# Start the StateMachine, it will wait for data on its FIFO.
sm.active(1)# Display a pattern on the LEDs via an array of LED RGB values.
ar = array.array("I", [0 for _ in range(NUM_LEDS)])##########################################################################
def pixels_show():dimmer_ar = array.array("I", [0 for _ in range(NUM_LEDS)])for i, c in enumerate(ar):r = int(((c >> 8) & 0xFF) * brightness)g = int(((c >> 16) & 0xFF) * brightness)b = int((c & 0xFF) * brightness)dimmer_ar[i] = (g << 16) + (r << 8) + bsm.put(dimmer_ar, 8)time.sleep_ms(10)def pixels_set(i, color):ar[i] = (color[1] << 16) + (color[0] << 8) + color[2]def pixels_fill(color):for i in range(len(ar)):pixels_set(i, color)def color_chase(color, wait):  # 颜色，等待时间for i in range(NUM_LEDS):  # 用灯的个数来遍历print(i)pixels_set(i, color)  # 单个灯（像素）设置颜色time.sleep(wait)pixels_show()# time.sleep(0.2)def color_chase1(color, wait):  # 颜色，等待时间num_leds = int(NUM_LEDS / 2)for i in range(num_leds + 1):  # 用灯的个数来遍历if i == 0:print('当前输出：', i, ' ', i, '\n')pixels_set(num_leds, color)  # 单个灯（像素）设置颜色elif i == num_leds:print('当前输出：', i, ' ', i, '11111\n')pixels_set(0, color)  # 单个灯（像素）设置颜色else:print('当前输出：', i, ' ', num_leds + i)print('当前输出：', i, ' ', num_leds - i, '\n')pixels_set(num_leds + i, color)  # 单个灯（像素）设置颜色pixels_set(num_leds - i, color)  # 单个灯（像素）设置颜色# pixels_set(i, color)  # 单个灯（像素）设置颜色time.sleep(wait)pixels_show()def color_chase2(color, wait):  # 颜色，等待时间num_leds = int(NUM_LEDS / 2)for i in range(num_leds + 1):  # 用灯的个数来遍历if i == 0:print('当前输出：', i, ' ', i, '\n')pixels_set(0, color)  # 单个灯（像素）设置颜色elif i == num_leds:print('当前输出：', i, ' ', i, '11111\n')pixels_set(num_leds, color)  # 单个灯（像素）设置颜色else:print('当前输出：', i, ' ', num_leds + i)print('当前输出：', i, ' ', num_leds - i, '\n')pixels_set(i, color)  # 单个灯（像素）设置颜色pixels_set(NUM_LEDS - i, color)  # 单个灯（像素）设置颜色# pixels_set(i, color)  # 单个灯（像素）设置颜色time.sleep(wait)pixels_show()def color_chase3(color, wait):  # 颜色，等待时间num_leds = int(NUM_LEDS / 2)for i in range(NUM_LEDS):  # 用灯的个数来遍历if i == 0:print('当前输出：', i, ' ', i, '\n')pixels_set(0, color)  # 单个灯（像素）设置颜色elif i == NUM_LEDS:print('当前输出：', i, ' ', i, '11111\n')pixels_set(NUM_LEDS, color)  # 单个灯（像素）设置颜色else:print('当前输出：', i, ' ', NUM_LEDS + i)print('当前输出：', i, ' ', NUM_LEDS - i, '\n')for ii in range(NUM_LEDS):if ii == i:pixels_set(i, color)  # 单个灯（像素）设置颜色else:pixels_set(ii, BLACK)  # 单个灯（像素）设置颜色# pixels_set(i, color)  # 单个灯（像素）设置颜色time.sleep(wait)pixels_show()def color_chase4(color, wait):  # 颜色，等待时间num_leds = int(NUM_LEDS / 2)for i in range(num_leds+1):  # 用灯的个数来遍历if i == 0:print('当前输出：', i, ' ', i, '\n')pixels_set(0, color)  # 单个灯（像素）设置颜色pixels_set(num_leds, color)  # 单个灯（像素）设置颜色elif i == num_leds :print('当前输出：', i, ' ', i, '11111\n')for iii in range(NUM_LEDS):pixels_set(iii, BLACK)  # 单个灯（像素）设置颜色pixels_set(0, color)  # 单个灯（像素）设置颜色pixels_set(num_leds, color)  # 单个灯（像素）设置颜色else:print('当前输出：', i, ' ', NUM_LEDS + i)print('当前输出：', i, ' ', NUM_LEDS - i, '\n')for ii in range(NUM_LEDS):if ii == i:pixels_set(i, color)  # 单个灯（像素）设置颜色elif ii == i + num_leds:pixels_set(i + num_leds, color)else:pixels_set(ii, BLACK)  # 单个灯（像素）设置颜色# pixels_set(i, color)  # 单个灯（像素）设置颜色time.sleep(wait)pixels_show()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:return (0, 0, 0)if pos < 85:return (255 - pos * 3, pos * 3, 0)if pos < 170:pos -= 85return (0, 255 - pos * 3, pos * 3)pos -= 170return (pos * 3, 0, 255 - pos * 3)def rainbow_cycle(wait):for j in range(255):for i in range(NUM_LEDS):rc_index = (i * 256 // NUM_LEDS) + jpixels_set(i, wheel(rc_index & 255))pixels_show()time.sleep(wait)BLACK = (0, 0, 0)
RED = (255, 0, 0)
YELLOW = (255, 150, 0)
GREEN = (0, 255, 0)
CYAN = (0, 255, 255)
BLUE = (0, 0, 255)
PURPLE = (180, 0, 255)
WHITE = (255, 255, 255)
COLORS = (BLACK, RED, YELLOW, GREEN, CYAN, BLUE, PURPLE, WHITE)# print("颜色填充")
# for color in COLORS:
#     pixels_fill(color)
#     pixels_show()
#     time.sleep(0.2)# print("彩虹色")
# while 1:
#     rainbow_cycle(0)print("颜色追逐")
while 1:RANDOM_COLORS = (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255))print(RANDOM_COLORS)color_chase1(RANDOM_COLORS, 0.05)RANDOM_COLORS = (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255))color_chase2(RANDOM_COLORS, 0.05)RANDOM_COLORS = (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255))color_chase3(RANDOM_COLORS, 0.05)RANDOM_COLORS = (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255))color_chase4(RANDOM_COLORS, 0.05)

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print("颜色追逐")
while 1:RANDOM_COLORS = (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255))print(RANDOM_COLORS)color_chase1(RANDOM_COLORS, 0.05)RANDOM_COLORS = (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255))color_chase2(RANDOM_COLORS, 0.05)RANDOM_COLORS = (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255))color_chase3(RANDOM_COLORS, 0.05)RANDOM_COLORS = (random.randint(0, 255), random.randint(0, 255), random.randint(0, 255))color_chase4(RANDOM_COLORS, 0.05)

将以上代码改为以下代码即可。

print("颜色追逐")
color_chase1(YELLOW, 0.05)

目前自己写了四种流水灯的模式，可能不适用与WS2812灯带，选择合适即可，当然还需要自己添加一些代码的。

color_chase1(YELLOW, 0.05)
color_chase2(YELLOW, 0.05)
color_chase3(YELLOW, 0.05)
color_chase4(YELLOW, 0.05)

总结

弄完之后其实感觉这床头灯还是差了很多东西，不尽人意。首先木板选短了10cm，没能完全遮住墙壁上的出线孔，需要后期买点什么东西延长挡住它。

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2023.12.21写