bb67ca9060
NOTE: weatherscene.py is known to NOT work under Python 3.x due to
an incompatibility with MicroPython's handling of strings and bytes.
This can be easily resolved although I opted to not do this, to preserve
compabilitity with the original code.
To use this on a Raspberry Pi, try:
sudo apt install -y python-pip python-requests
sudo pip install rpi_ws281x
Then connect the display's data line to the Raspberry Pi's GPIO 18 (PCM CLK)
(see https://pinout.xyz/)
References:
- https://github.com/noahwilliamsson/lamatrix/issues/1
- https://github.com/rpi-ws281x/rpi-ws281x-python (userspace WS281x driver)
- https://github.com/jgarff/rpi_ws281x (wiring docs)
59 lines
2.0 KiB
Python
59 lines
2.0 KiB
Python
# HAL for Raspberry Pi with https://github.com/rpi-ws281x/rpi-ws281x-python
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# See https://github.com/jgarff/rpi_ws281x for more details on this library.
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#
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# The below code assumes the LED strip is connected to GPIO 18 (PCM CLK)
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# (see https://pinout.xyz) and that you've installed the rpi_ws281x library.
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#
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# For Python 2.x:
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#
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# sudo apt install -y python-pip; sudo pip install rpi_ws281x
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#
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# For Python 3.x:
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#
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# sudo apt install -y python3-pip; sudo pip3 install rpi_ws281x
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#
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#
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from rpi_ws281x import PixelStrip, Color
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# LED strip configuration:
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LED_PIN = 18 # GPIO pin connected to the pixels (18 uses PWM!).
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# LED_PIN = 10 # GPIO pin connected to the pixels (10 uses SPI /dev/spidev0.0).
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LED_FREQ_HZ = 800000 # LED signal frequency in hertz (usually 800khz)
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LED_DMA = 10 # DMA channel to use for generating signal (try 10)
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LED_BRIGHTNESS = 255 # Set to 0 for darkest and 255 for brightest
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LED_INVERT = False # True to invert the signal (when using NPN transistor level shift)
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LED_CHANNEL = 0 # set to '1' for GPIOs 13, 19, 41, 45 or 53
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class RaspberryPiHAL:
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def __init__(self, config):
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self.num_pixels = config['LedMatrix']['columns'] * config['LedMatrix']['stride']
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self.strip = PixelStrip(self.num_pixels, LED_PIN, LED_FREQ_HZ, LED_DMA, LED_INVERT, LED_BRIGHTNESS, LED_CHANNEL)
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self.strip.begin()
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def init_display(self, num_pixels=64):
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self.clear_display()
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def clear_display(self):
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c = Color(0, 0, 0)
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for i in range(self.num_pixels):
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self.strip.setPixelColor(i, c)
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self.strip.show()
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def update_display(self, num_modified_pixels):
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if not num_modified_pixels:
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return
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self.strip.show()
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def put_pixel(self, addr, r, g, b):
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self.strip.setPixelColor(addr % self.num_pixels, Color(r, g, b))
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def reset(self):
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self.clear_display()
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def process_input(self):
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#TODO: implement
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return 0
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def set_rtc(self, t):
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#Not relevant
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pass
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def set_auto_time(self, enable=True):
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#Not relevant
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pass
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def suspend_host(self, restart_timeout_seconds):
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#Not relevant
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pass
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