どうも「はてな記法」を使わないと、プログラムがちゃんと表示されないので改めて書きました。
ov150.hatenablog.com
再掲
main.py
from machine import Pin from neopixel import myNeopixel import time NUM_LEDS = 18 #つないだneopixelの個数に18から変更する(10個なら「10」に) np = myNeopixel(NUM_LEDS, 0) #Pin変更したら数字を0から変更する(GP1なら「1」に) red = 0 #red green = 0 #green blue = 0 #blue def wheel(pos): global red, green, blue WheelPos = pos % 255 if WheelPos < 85: red = (255-WheelPos*3) green = (WheelPos*3) blue=0 elif WheelPos >= 85 and WheelPos < 170: WheelPos -= 85; red = 0 green = (255 - WheelPos*3) blue = (WheelPos*3) else : WheelPos -= 170; red = (WheelPos*3) green = 0 blue = (255-WheelPos*3) np.brightness(20) while True: for i in range(0, 255): for j in range(0, 18): #つないだneopixelの個数に18から変更する(10個なら「10」に) wheel(i + j*255 // 18) #つないだneopixelの個数に18から変更する(10個なら「10」に) np.set_pixel(j, red, green, blue) np.show() time.sleep_ms(1)
neopixel.py
import array, time from machine import Pin import rp2 @rp2.asm_pio(sideset_init=rp2.PIO.OUT_LOW, out_shiftdir=rp2.PIO.SHIFT_LEFT, autopull=True, pull_thresh=24) def ws2812(): T1 = 2 T2 = 5 T3 = 8 wrap_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 class myNeopixel: def __init__(self, num_leds, pin, delay_ms=1): self.pixels = array.array("I", [0 for _ in range(num_leds)]) self.state_machine = 0 self.sm = rp2.StateMachine(self.state_machine, ws2812, freq=8000000, sideset_base=Pin(pin)) self.sm.active(1) self.num_leds = num_leds self.delay_ms = delay_ms self.brightnessvalue = 255 def brightness(self, brightness = None): if brightness == None: return self.brightnessvalue else: if (brightness < 1): brightness = 1 if (brightness > 255): brightness = 255 self.brightnessvalue = brightness def set_pixel_line_gradient(self, pixel1, pixel2, left_r, left_g, left_b, right_r, right_g, right_b): if pixel2 - pixel1 == 0: return right_pixel = max(pixel1, pixel2) left_pixel = min(pixel1, pixel2) for i in range(right_pixel - left_pixel + 1): fraction = i / (right_pixel - left_pixel) red = round((right_r - left_r) * fraction + left_r) green = round((right_g - left_g) * fraction + left_g) blue = round((right_b - left_b) * fraction + left_b) self.set_pixel(left_pixel + i, red, green, blue) def set_pixel_line(self, pixel1, pixel2, r, g, b): for i in range(pixel1, pixel2+1): self.set_pixel(i, r, g, b) def set_pixel(self, pixel_num, r, g, b): blue = round(b * (self.brightness() / 255)) red = round(r * (self.brightness() / 255)) green = round(g * (self.brightness() / 255)) self.pixels[pixel_num] = blue | red << 8 | green << 16 def rotate_left(self, num_of_pixels): if num_of_pixels == None: num_of_pixels = 1 self.pixels = self.pixels[num_of_pixels:] + self.pixels[:num_of_pixels] def rotate_right(self, num_of_pixels): if num_of_pixels == None: num_of_pixels = 1 num_of_pixels = -1 * num_of_pixels self.pixels = self.pixels[num_of_pixels:] + self.pixels[:num_of_pixels] def show(self): for i in range(self.num_leds): self.sm.put(self.pixels[i],8) time.sleep_ms(self.delay_ms) def fill(self, r, g, b): for i in range(self.num_leds): self.set_pixel(i, r, g, b) time.sleep_ms(self.delay_ms)