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  • Eka's Avatar
    09-19-2018, 12:42 PM
    I guess I should mention that from my 12 AWG supply wires, I have 100uF electrolytic capacitors and connections at the density of every 10 LEDs over to the +5V and ground on the strips on one prototype. It didn't allow...
    7 replies | 110 view(s)
  • Eka's Avatar
    09-19-2018, 12:11 AM
    Could be that or the infamous APA102 timing issue that means longer strips have to be run at slower data rates. Just slow this down DATA_RATE_MHZ(8) until it works reliably. I have a 20 Amp medical grade DC to DC...
    7 replies | 110 view(s)
  • Eka's Avatar
    09-18-2018, 06:13 PM
    pin 14 is an alternate for SCK0 so is fine. The card that comes with the 3.6 shows it and other alternates. I have a system setup with both MOSI0 on pin 11 & SCK0 on pin 14, and MOSI1 on pin 0 & SCK1 on pin 32...
    7 replies | 110 view(s)
  • Eka's Avatar
    09-11-2018, 03:16 PM
    I've only skimmed through this article at DigiKey. It is primarily on USB 3.1 power capabilities and implementing them with a USB-C connector, up to 20V at 5 Amps is possible. It just touches on the battery charging of...
    132 replies | 6645 view(s)
  • Eka's Avatar
    09-01-2018, 07:14 AM
    Use a powered USB hub so you don't blow the port on the PC if it isn't fixed.
    7 replies | 218 view(s)
  • Eka's Avatar
    08-28-2018, 04:06 AM
    Eka replied to a thread Repairing a WS2812 in General Discussion
    In order to get an idea what needs to be done, I'd need a closeup of an LED to see what chip package type it is. That effects the best methods for removal. There are people over at the EEVblog forum that can help you...
    5 replies | 226 view(s)
  • Eka's Avatar
    08-27-2018, 11:04 PM
    The capacitors are there to absorb spikes generated during switching on and off of gates, LEDs, etc. Also a big bulk capacitor will absorb the bigger spike when you turn the string off. I have 100uF electrolytic plus...
    3 replies | 141 view(s)
  • Eka's Avatar
    08-27-2018, 10:37 PM
    Sorry, still no code that will run out of the box. If you have questions about how the parts integrate in to the missing code and the variables I may have left out, ask. Because of my CFS, I don't have the time to spend...
    25 replies | 11913 view(s)
  • Eka's Avatar
    08-23-2018, 07:49 AM
    I'm currently away from my development computer and the code which they are part of. So just some notes that elaborate on the interrupt routines and how they are tied into my code. As said, this is a work in...
    25 replies | 11913 view(s)
  • Eka's Avatar
    08-16-2018, 09:40 PM
    This is the type of on/off I'd like to see. I usually see it implemented as press to turn on. Short press to turn off by normal software control, long press to force off now. Yep, I remembered reading about some support...
    20 replies | 600 view(s)
  • Eka's Avatar
    08-16-2018, 01:11 AM
    That sucks. I know ways around it, but they all make the PCB cost more, and I don't see that being done. I very likely wouldn't make the decision to add that much cost to the PCB.
    132 replies | 6645 view(s)
  • Eka's Avatar
    08-16-2018, 12:55 AM
    Eka replied to a thread Repairing a WS2812 in General Discussion
    I'm no expert either, but I at least know many of the issues and were to look. Also soldering is so second nature to me and I don't think of how to do it. I've been doing it since I was 8. PS, buy the high quality...
    5 replies | 226 view(s)
  • Eka's Avatar
    08-15-2018, 08:09 PM
    The more I read on FlexIO and XBAR the more mushy my brain gets, but they look very interesting. I already can see where they would provide low level hardware support for coordinated motion control in a robot or 3D...
    132 replies | 6645 view(s)
  • Eka's Avatar
    08-14-2018, 07:44 PM
    Eka replied to a thread Repairing a WS2812 in General Discussion
    It's basic SMD rework, but the chip may be highly water absorbent so it may need baking out first if hot air is used. Some of the suppliers also use low melting point plastics which means temperature control is vital. ...
    5 replies | 226 view(s)
  • Eka's Avatar
    08-14-2018, 07:20 PM
    I made a mistake on the number of columns. There are 13, labeled S0 to S12. S is likely for scan. This keyboard uses a Toshiba 4044 CMOS R/S latch for it's capacitive sensor. ON semiconductor makes one with similar...
    11 replies | 474 view(s)
  • Eka's Avatar
    08-13-2018, 06:30 PM
    These are the interrupt service routines I use to quickly slew the Teensy RTC to the PPS from the GPS's PPS output, then gather the data for calculating fine grained rtc adjustments for various temperatures. I included...
    25 replies | 11913 view(s)
  • Eka's Avatar
    08-13-2018, 07:21 AM
    I have a small format keyboard I love that has the old large diameter DIN connector. After many years of use the keys still have excellent action because I changed the rubber membrane with small springs at each key. I'm...
    11 replies | 474 view(s)
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About Eka

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About Eka
Biography:
Remembers resistor transistor logic.
Location:
Land between two rivers
Occupation:
Farmer, artist.

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Fastled issue on Teensy 3.6 09-19-2018 12:42 PM
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09-19-2018 03:35 PM
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05-18-2018