Wow, that was really easy to make work. I didn't even use the 74HCT245. I hooked GND to ground and the +5 to the 3V3 on the bone. I attached the DI to P9_22 and it just worked!
If I understand the code right, the data signal appears on several GPIO pins as reported by pinmap.js. However I find it works on some, but not on others. Have you seen this? Thanks for the pointer to the github site. The instructions made it really easy to get going. Now I need to do something interesting with it. --Mark On Monday, April 28, 2014 7:10:16 AM UTC-4, Ian Woloschin wrote: > > Good news, one NeoPixel stick works :). Following the basic instructions > found on Yono's LEDscape repository, combined with a 74HCT245N and I've got > flashing NeoPixels run off my BBB. The important part is making sure to > connect the 74HCT245 correctly, otherwise nothing will happen. Make sure > that the BBB is on the Ax side and the NeoPixels are on the Bx side, and > make sure DIR is +5V and /OE is 0V. Everything *should* just work after > that. > > You may have luck with a different level shifter, but the 74HCT245 seems > to be highly recommended by a bunch of people, so I went with that. > > My next step is going to be trying to implement some Python code to do the > logic in my program, and use Yono's LEDscape code just to drive the > NeoPixels. > > On Friday, April 25, 2014 11:16:52 AM UTC-4, Ian Woloschin wrote: >> >> Sorry, one minor correction. >> >> The dtb file should be in one of the following places: >> >> /boot >> /boot/uboot/dtbs >> >> If you're using the latest Debian image then it's the second. I believe >> Angstrom uses the first. It looks like the Yona-Appletree LEDscape readme >> has been just been updated to reflect this. >> >> -Ian >> >> On Friday, April 25, 2014 11:12:10 AM UTC-4, Ian Woloschin wrote: >>> >>> I've been using a LEDscape fork that I think will better allow me to use >>> Python to write the bulk of my program, and then LEDscape to do the >>> Neopixel control. >>> >>> https://github.com/Yona-Appletree/LEDscape >>> >>> Everything works, except that you should check the uEnv.txt file in >>> /boot or possible /boot/uboot to make sure you've put the *.dtb file in the >>> correct place to be read. Different distros do different things, so it's >>> hard to say exactly what you're looking for here. >>> >>> Unfortunately, USPS is late, so I won't have my Neopixel Stick before I >>> leave this evening, so I won't be putting any time into this over the >>> weekend, but I do expect to pick this back up early next week. >>> >>> -Ian >>> >>> On Friday, April 25, 2014 8:07:55 AM UTC-4, Yoder, Mark A wrote: >>>> >>>> Ian: >>>> What instructions were you following? >>>> >>>> --Mark >>>> >>>> Sent from my iPad >>>> >>>> On Apr 25, 2014, at 7:21 AM, "Ian Woloschin" <iwolo...@gmail.com> >>>> wrote: >>>> >>>> I'm an idiot. I blindly followed instructions that were likely for >>>> Angstrom, and put the dtb file in the wrong place, /boot instead of >>>> /boot/uboot/dtbs. Now that the dtb file is being read I've got everything >>>> showing up properly, which is great because I've got my first NeoPixel >>>> stick arriving in the mail today. Unfortunately I'll be out of town this >>>> weekend, but I've got a 4 hour train ride back Monday morning so I may try >>>> to get some stuff working on the train. >>>> >>>> On Friday, April 25, 2014 7:05:58 AM UTC-4, Ian Woloschin wrote: >>>>> >>>>> I'm looking into the same thing and running into the same problems of >>>>> no simple tutorials. At this point I'm having issues getting the PRU to >>>>> even be enabled, and I'm not really sure why. >>>>> >>>>> On Tuesday, April 22, 2014 12:59:09 PM UTC-4, Mark A. Yoder wrote: >>>>>> >>>>>> David: >>>>>> Thanks for the pointer, however I had already Google'd around and >>>>>> picked the LEDscape as the most promising. Since I haven't uncovered any >>>>>> 'getting started' guides for it I guess I'll just dive in a figure it >>>>>> out >>>>>> for myself. >>>>>> >>>>>> --Mark >>>>>> >>>>>> On Monday, April 21, 2014 1:48:15 PM UTC-4, dwfunk4475 wrote: >>>>>>> >>>>>>> http://lmgtfy.com/?q=beaglebone+black+ws2812 >>>>>>> >>>>>>> >>>>>>> Plenty of tutorials . . . adapt to whatever pin(s) you wish to >>>>>>> use on our BBB >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> -david >>>>>>> >>>>>>> >>>>>>> On Mon, Apr 21, 2014 at 11:00 AM, Mark A. Yoder <mark.a...@gmail.com >>>>>>> > wrote: >>>>>>> >>>>>>>> Hi Beagle'ers: >>>>>>>> I have a string adafruit NEOpixel LEDs[1] that I want to drive >>>>>>>> with the BBB. LEDscape[2] looks like a good way to drive the LEDs via >>>>>>>> the >>>>>>>> PRUs. >>>>>>>> >>>>>>>> I'm not sure how to get started. Has anyone used this software >>>>>>>> to drive the LEDs? What should I wire where? >>>>>>>> >>>>>>>> --Mark >>>>>>>> >>>>>>>> [1] http://www.adafruit.com/products/1376 >>>>>>>> [2] https://github.com/osresearch/LEDscape >>>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> -- >>>> For more options, visit http://beagleboard.org/discuss >>>> --- >>>> You received this message because you are subscribed to a topic in the >>>> Google Groups "BeagleBoard" group. >>>> To unsubscribe from this topic, visit >>>> https://groups.google.com/d/topic/beagleboard/WvwfBq26kEk/unsubscribe. >>>> To unsubscribe from this group and all its topics, send an email to >>>> beagleboard...@googlegroups.com. >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>>> -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. 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