Drarok

Most recent activity

• External USB bluetooth (4.0) dongle not connecting to Puck after upgrade to macOS High Sierra but was working fine before that

  in Puck.js, Pixl.js and MDBT42 • 6 years, 3 months

  

  It's also not reasonable for them to reject app submissions that are merely bug fixes, but they do that, too…

• Puck.js and Neopixels – Possible?

  @Drarok started

  • 13 comments
  • 4,716 views

  @Drarok replied
• Puck.js and Neopixels – Possible?

  in Puck.js, Pixl.js and MDBT42 • 6 years, 11 months

  

  Hah, brilliant! I built a little library to make it a little simpler for myself – I kept mixing up pixel index and the fact that each one is made of 3 array elements.

• Puck.js and Neopixels – Possible?

  in Puck.js, Pixl.js and MDBT42 • 6 years, 11 months

  

  I've powered the ring off the 3.3v line of my power supply, and connected D30 direct to the ring's data pin, and now it's working!

  Every so often, it has a bit of a wobble, but I think there's weird capacitance or grounding issues making the signals a bit unreliable.

• Puck.js and Neopixels – Possible?

  in Puck.js, Pixl.js and MDBT42 • 6 years, 11 months

  

  @Spocki – Hmm, that's weird. I read elsewhere that they need a 5v supply and data line.

  @Gordon – ah, amazing! I'll update to 1v92 and see how I get on after that. Thanks!

• Puck.js and Neopixels – Possible?

  in Puck.js, Pixl.js and MDBT42 • 6 years, 11 months

  

  I've got a Neopixel Ring (12 LEDs), and two Pucks. I know they run on different voltages, so I've connected the Neopixel to a 5v USB supply, and used an opto-isolator to drive the data pin at 5v from the Puck.

  I can't figure out how to make it work, though.

  I've cobbled this together from various posts that I've found, but I assume I'm doing something wrong (or the Puck can't do the data rate I need perhaps?):

  const PIN = D30;
  const LEDS = 3;
  
  function main() {
    pinMode(PIN, 'output');
    // I'm using 400000 here because I read they need a 4- or 8kHz stream, but no dice.
    SPI1.setup({ baud: 400000, mosi: PIN });
  
    let arr = new Uint8ClampedArray(3 * LEDS);
    let idx = 0;
    for (let i = 0; i < LEDS; ++i) {
      arr[idx++] = 255;
      arr[idx++] = 0;
      arr[idx++] = 0;
    }
  
    console.log(arr);
    SPI1.send4bit(arr, 0b0001, 0b0011);
  }
  
  main();
  

  I've confirmed that the isolator can do upwards of 50kHz, and that it's working (by using a plain LED and setting D30 high – it lights from the 5v rail).

  Help! Thanks in advance.

• Attempting (and failing) to use a 74HC595 Shift Register

  in Puck.js, Pixl.js and MDBT42 • 7 years

  

  I've got a 3.3v power supply unit which I was using, but later also tried it just off the battery.

  I've no idea what was causing the dimness – that's since gone away. Bad wiring or dodgy configuration is entirely likely!

• Attempting (and failing) to use a 74HC595 Shift Register

  @Drarok started

  • 9 comments
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  @Drarok replied
• Attempting (and failing) to use a 74HC595 Shift Register

  in Puck.js, Pixl.js and MDBT42 • 7 years

  

  I don't know what 'bias' means in this context.

  I'm a developer, so confident of my code, but an electronics noob. Pretty sure it's working sensibly now, but either my breadboard has a bad connection with a wire, or I've soldered a wire badly. I wouldn't know how to share a schematic either, other than to take a picture of what I've got!

  Thanks for your help though. 👍🏼

• Attempting (and failing) to use a 74HC595 Shift Register

  in Puck.js, Pixl.js and MDBT42 • 7 years

  

  And now it's not working at all again, and I've no idea why! 😭

  Edit: I think that failure was a dry joint or bad wire. Ugh!