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import time
import machine
from esp import neopixel_write
class NeoPixel:
def __init__(self, pin, n):
self.pin = pin
self.n = n
self.buf = bytearray(n * 3)
def __setitem__(self, index, val):
r, g, b = val
self.buf[index * 3] = g
self.buf[index * 3 + 1] = r
self.buf[index * 3 + 2] = b
def __getitem__(self, index):
i = index * 3
return self.buf[i], self.buf[i + 1], self.buf[i + 2]
def write(self):
neopixel_write(self.pin, self.buf, True)
def test():
# put a neopixel strip on GPIO4
p = machine.Pin(4, machine.Pin.OUT)
np = NeoPixel(p, 8)
n = np.n
# cycle
for i in range(4 * n):
for j in range(n):
np[j] = (0, 0, 0)
np[i % n] = (255, 255, 255)
np.write()
time.sleep_ms(25)
# bounce
for i in range(4 * n):
for j in range(n):
np[j] = (0, 0, 128)
if (i // n) % 2 == 0:
np[i % n] = (0, 0, 0)
else:
np[n - 1 - (i % n)] = (0, 0, 0)
np.write()
time.sleep_ms(60)
# fade in/out
for i in range(0, 4 * 256, 8):
for j in range(n):
if (i // 256) % 2 == 0:
val = i & 0xff
else:
val = 255 - (i & 0xff)
np[j] = (val, 0, 0)
np.write()
# clear
for i in range(n):
np[i] = (0, 0, 0)
np.write()
test()
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