bibliopixel _> rpiWS281x

Old Google Group Archive
#1

Hi Gang

Can I get an example of how you’d implement rpiWS281x in a project file?

I’ve got the library installed and the example python scripts in rpiWS281x seem to work, using the following params from strandtest.py in the exampls of rpiWS281x):

LED strip configuration:

LED_COUNT = 26 # Number of LED pixels.
LED_PIN = 18 # GPIO pin connected to the pixels (18 uses PWM!).
#LED_PIN = 10 # GPIO pin connected to the pixels (10 uses SPI /dev/spidev0.0).
LED_FREQ_HZ = 800000 # LED signal frequency in hertz (usually 800khz)
LED_DMA = 10 # DMA channel to use for generating signal (try 10)
LED_BRIGHTNESS = 255 # Set to 0 for darkest and 255 for brightest
LED_INVERT = False # True to invert the signal (when using NPN transistor level shift)
LED_CHANNEL = 0 # set to ‘1’ for GPIOs 13, 19, 41, 45 or 53

``

(I’m using the PiPixel btw)

what I’m missing is how to properly construct the neopixel driver in a project file. I’m assuming I’d need to pass parameters like pin and clock speed.

ERROR - run - When reading file 00-strip.json:
{
“aliases”: {
“bpa”: “BiblioPixelAnimations.strip”
},
“animation”: {
“animations”: [
“@bpa.Alternates”,
“@bpa.BinaryEpochClock.BEClock”,
“@bpa.ColorChase”,
“@bpa.ColorFade”,
“@bpa.ColorPattern”,
“@bpa.ColorWipe”,
“@bpa.FireFlies”,
“@bpa.HalvesRainbow”,
“@bpa.LarsonScanners.LarsonRainbow”,
“@bpa.LarsonScanners.LarsonScanner”,
“@bpa.LinearRainbow”,
“@bpa.PartyMode”,
“@bpa.PixelPingPong”,
“@bpa.RGBClock”,
“@bpa.Rainbows.Rainbow”,
“@bpa.Rainbows.RainbowCycle”,
“@bpa.Searchlights”,
“@bpa.Wave”,
“@bpa.Wave.WaveMove”,
“@bpa.WhiteTwinkle”,
“@bpa.hexclock”
],
“length”: 1,
“run”: {
“fps”: 30,
“seconds”: 23
},
“typename”: “sequence”
},
“driver”: {
“num”: 26,
“typename”: “neopixel”
},
“layout”: “strip”
}

No member specified in neopixel

``

#2

Steven,

So sorry, but it seems that the wiki page for this driver got clobbered sometime recently… there used to be a bunch more detail. Will fix ASAP. The driver in our system isn’t actually called neopixel that’s just the underlying module it uses. What you need should be this:

    "driver": {
"num": 26,
"typename": "pi_ws281x",
"c_order": "RGB",
"gpio": 18,
"ledDma": 10
}

Honestly, I never change ledDma, but yours was different than our default of 5, so I included that. The rest of the unlisted settings are the same.

Please don’t hesitate to reach out again if you have any other questions :slight_smile:

Cheers,

Adam

​

···

On Wed, Apr 18, 2018 at 9:20 PM, Steven Nicholson steven@airbagproductions.com wrote:

Hi Gang

Can I get an example of how you’d implement rpiWS281x in a project file?

I’ve got the library installed and the example python scripts in rpiWS281x seem to work, using the following params from strandtest.py in the exampls of rpiWS281x):

LED strip configuration:

LED_COUNT = 26 # Number of LED pixels.
LED_PIN = 18 # GPIO pin connected to the pixels (18 uses PWM!).
#LED_PIN = 10 # GPIO pin connected to the pixels (10 uses SPI /dev/spidev0.0).
LED_FREQ_HZ = 800000 # LED signal frequency in hertz (usually 800khz)
LED_DMA = 10 # DMA channel to use for generating signal (try 10)
LED_BRIGHTNESS = 255 # Set to 0 for darkest and 255 for brightest
LED_INVERT = False # True to invert the signal (when using NPN transistor level shift)
LED_CHANNEL = 0 # set to ‘1’ for GPIOs 13, 19, 41, 45 or 53

``

(I’m using the PiPixel btw)

what I’m missing is how to properly construct the neopixel driver in a project file. I’m assuming I’d need to pass parameters like pin and clock speed.

ERROR - run - When reading file 00-strip.json:
{
“aliases”: {
“bpa”: “BiblioPixelAnimations.strip”
},
“animation”: {
“animations”: [
“@bpa.Alternates”,
“@bpa.BinaryEpochClock.BEClock”,
“@bpa.ColorChase”,
“@bpa.ColorFade”,
“@bpa.ColorPattern”,
“@bpa.ColorWipe”,
“@bpa.FireFlies”,
“@bpa.HalvesRainbow”,
“@bpa.LarsonScanners.LarsonRainbow”,
“@bpa.LarsonScanners.LarsonScanner”,
“@bpa.LinearRainbow”,
“@bpa.PartyMode”,
“@bpa.PixelPingPong”,
“@bpa.RGBClock”,
“@bpa.Rainbows.Rainbow”,
“@bpa.Rainbows.RainbowCycle”,
“@bpa.Searchlights”,
“@bpa.Wave”,
“@bpa.Wave.WaveMove”,
“@bpa.WhiteTwinkle”,
“@bpa.hexclock”
],
“length”: 1,
“run”: {
“fps”: 30,
“seconds”: 23
},
“typename”: “sequence”
},
“driver”: {
“num”: 26,
“typename”: “neopixel”
},
“layout”: “strip”
}

No member specified in neopixel

``

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