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- """Control NeoPixel-style light strips from ThingFlow.
- num_pixels and bytes_per_pixel will vary, depending on your light strip.
- Set pinno to the gpio pin number where you connected the data line of
- the NeoPixel.
- If you have bytes_per_pixel=3, the events will be of the form:
- (pixelno, r, g, b)
- If you have bytes_per_pixel=4, the events will be of the form:
- (pixelno, r, g, b, w)
- """
- from machine import Pin
- from neopixel import NeoPixel
- class NeoPixelWriter:
- def __init__(self, num_pixels=10, bytes_per_pixel=4, pinno=15):
- pin = Pin(pinno, Pin.OUT)
- self.np = NeoPixel(pin, num_pixels, bpp=bytes_per_pixel)
- self.bytes_per_pixel = bytes_per_pixel
- self.tuple_len = bytes_per_pixel+1
- def on_next(self, x):
- """The event should be a tuple/list where the first element
- is the pixel number and the rest are the settings for that pixel
- OR it can be a standard (sensor_id, ts, event) tuple, where the control
- message is in the third element.
- """
- if len(x)==3 and (isinstance(x[2], tuple) or isinstance(x[2], list)) and \
- len(x[2])==self.tuple_len:
- x = x[2] # the control message is embedded in a standard triple
- elif len(x)!=self.tuple_len:
- raise Exception("expecting a tuple of length %d" % self.tuple_len)
- pixel = x[0]
- self.np[pixel] = x[1:]
- self.np.write()
- def on_error(self, e):
- pass
- def on_completed(self):
- pass
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