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  • PhilB's Avatar
    05-11-2021, 09:55 PM
    Yeah, OSHPark runs about 8-10 days with the default options. You do anything different (like black mask), it will take about 2 weeks. I have used PCBWay and JLCPCB. I don't recall significant alignment issues with...
    22 replies | 2656 view(s)
  • PhilB's Avatar
    05-10-2021, 06:48 PM
    Update to this thread. The Bel Magjack/USB combo device is out of stock everywhere. However there is a pin compatible replacement available - The Abracon ARJE-0032. I looked at the datasheet and it appears to be true....
    23 replies | 1355 view(s)
  • PhilB's Avatar
    05-10-2021, 02:31 AM
    Zero in stock at Digikey, too. Looked on findchips - sold out everywhere. sheesh. Edit: You may be in luck! The Abracon ARJE-0032 is said to be a direct (ie, pin compatible) replacement. I looked at the datasheet...
    22 replies | 2656 view(s)
  • PhilB's Avatar
    05-08-2021, 05:19 PM
    On a slightly different topic, I have a new version of the Teensy 4.1 grblHAL board coming that routes the HostUSB pins to a USB A socket. The purpose of that is to allow USB MPG/Pendant/game controllers/... to be used...
    22 replies | 2656 view(s)
  • PhilB's Avatar
    05-08-2021, 05:13 PM
    You can order a board from OSHPark. There are two to choose from The board shown above. $7.90 for 3 A wide version with mounting slots. $8.35 for 3 The wide version is basically the same as the other one just...
    22 replies | 2656 view(s)
  • PhilB's Avatar
    05-03-2021, 12:11 AM
    Yes, I got your order. Thank You. Will ship tomorrow. Shipping times to Germany generally take 10-14 days. Yes, it is possible. You may need to make modifications to the board for spindle sync. Described here. (2...
    64 replies | 7457 view(s)
  • PhilB's Avatar
    04-30-2021, 05:11 AM
    I would first verify that your side is working correctly. Test loop-back where you connect your TX to your RX. Send something and see if you can receive it. I would do this both for the Teensy TX/RX pair and then with...
    5 replies | 197 view(s)
  • PhilB's Avatar
    04-29-2021, 06:30 PM
    I think the question is about a Teensy that is not powered from USB and thus has no source of +5V for the Host USB connector. You will need to provide external +5V for that. What is driving the 3.3V regulator on your...
    5 replies | 572 view(s)
  • PhilB's Avatar
    04-29-2021, 06:23 PM
    While that doesn't look perfect to me, the standards for what constitutes a misaligned component allows for a surprising amount of misalignment. Considerably more than the naked eye would be able to see. For what...
    9 replies | 386 view(s)
  • PhilB's Avatar
    04-26-2021, 04:43 PM
    So the actual device is some distance (300-400mm??) from the ADC? I would definitely use shielded wires. If filtering (hw or sw) isn't enough to deal with the noise, I'd use an external ADC as close to the source as...
    8 replies | 318 view(s)
  • PhilB's Avatar
    04-24-2021, 06:33 PM
    Your description is a bit confusing to me. First, are you reading a quadrature encoder via an ADC? That's not how I would do it but each to their own. Got Datasheet? When you say "fluctuates by around plus or...
    8 replies | 318 view(s)
  • PhilB's Avatar
    04-21-2021, 03:33 PM
    Which is why I have been using I2C ADCs - you can get a lot cleaner signal into (and out of) one of those. An ADC in a microcontroller is subject to a lot of compromises. I like it when the conversions happens far from...
    490 replies | 56068 view(s)
  • PhilB's Avatar
    04-21-2021, 03:24 PM
    I got a couple of the M.2 connectors and they look to be pretty tricky to hand solder. Lots of solder wick, for sure. I'd go for reflow. Definitely not for your average hobbyist. Costs a lot more than 2 rows of 2.54mm...
    490 replies | 56068 view(s)
  • PhilB's Avatar
    04-18-2021, 03:10 AM
    The UI is a little obscure. - Route/Differential Pair. Get as far as you can. hit escape - Finish using individual routing. - Route/Tune Track Length. - Click on which ever is the longest of the pair. It...
    7 replies | 287 view(s)
  • PhilB's Avatar
    04-15-2021, 09:41 PM
    50mm is ok. Just length match them. Ideally, you would run the T and R pairs next to each other as much as possible. Here is what I did on my most recent T4.1 board. Note, that is for a different MagJack so different...
    7 replies | 287 view(s)
  • PhilB's Avatar
    04-15-2021, 08:46 PM
    Hi, Ken, there really isn't much magic to the traces. Since the goal is to have equal lengths, the Kit board traces won't help you very much. For the receive and transmit lines, I would use differential routing to get...
    7 replies | 287 view(s)
  • PhilB's Avatar
    04-14-2021, 02:28 PM
    I have looked at sensing soil moisture to control irrigation off and on for 20+ years. I think it is a quixotic quest. Even if you could create a perfect sensor (inexpensive, long lasting, reliable, easy to calibrate)...
    5 replies | 300 view(s)
  • PhilB's Avatar
    04-12-2021, 03:32 PM
    I have been spending some time with the RasPi Pico and one thing they did that I really like is a Schottky diode between VUSB and 5V outputs. While it does cause a diode drop on the power line, I think it is very much...
    490 replies | 56068 view(s)
  • PhilB's Avatar
    04-10-2021, 11:39 PM
    I'm using the 6N137 on a Teensy's output. The opto inverts the signal - when the internal LED lights, pin 6 goes to 0. You can fix this by connecting +V to pin 2 and the signal on pin 3 with an appropriate dropping...
    13 replies | 463 view(s)
  • PhilB's Avatar
    04-09-2021, 08:44 PM
    If you get a board built by JLCPCB, please write back with a status report. I just populated the MagJacks myself. I'd like to know how them assembling it goes for you.
    8 replies | 344 view(s)
  • PhilB's Avatar
    04-09-2021, 07:58 PM
    Actually, JLCPCB has a number of MagJacks that can be made to work with the Teensy 4.1. But before that, a PSA. A MagJack is an RJ45 connector with the necessary magnetics to connect an Ethernet Phy to an Ethernet...
    8 replies | 344 view(s)
  • PhilB's Avatar
    04-05-2021, 04:42 PM
    What are you trying to do with the teensy? Do you need Ethernet or Host USB? Probably the easiest breakout is a solderless breadboard.
    4 replies | 376 view(s)
  • PhilB's Avatar
    04-05-2021, 04:05 PM
    I have been thinking about this idea in the background since you posted it. I am wondering if a custom smart motor controller could reduce your I/O requirements. The idea is each "bob" has a controller board that runs...
    14 replies | 833 view(s)
  • PhilB's Avatar
    04-02-2021, 08:19 PM
    Some details to be worked through. Assuming you have a high side load, this is a decent tutorial. You definitely want Rb to limit your current through the teensy pin. I'd use 5 mA as the goal. The diode is not needed...
    2 replies | 249 view(s)
  • PhilB's Avatar
    04-01-2021, 07:27 PM
    but ot can be fun. I blame it all on Monster with their "oxygen free copper" BS. I recall seeing some hype about it broadening the soundstage and reducing the noise floor. PT Barnum would recognize it. The health...
    490 replies | 56068 view(s)
  • PhilB's Avatar
    04-01-2021, 06:30 PM
    $1000? Try used for $6499.00 + $80 shipping. The "horsie" makes it better. And I don't think the date is related... But Audio products are often the domain of scam artists. The placebo effect is very strong there. I...
    490 replies | 56068 view(s)
  • PhilB's Avatar
    04-01-2021, 04:36 PM
    Yeah, that one corner is a bit tight. When I designed the board, I used 4-40 screws to model against. They clear tight but ok. Other screws like M3s are a little bigger. I have since moved to M3 spacing because of...
    64 replies | 7457 view(s)
  • PhilB's Avatar
    04-01-2021, 01:22 AM
    I like the look of the KaRo compute modules. Something similar based on the 1170 would be pretty interesting to me. The one issue that gives me pause is the exposed ground plane that prevents top layer routing under...
    490 replies | 56068 view(s)
  • PhilB's Avatar
    03-31-2021, 09:26 PM
    Looks like it does not support the Ethernet and Host USB headers. That is a reasonably good price, though.
    4 replies | 308 view(s)
  • PhilB's Avatar
    03-19-2021, 08:46 PM
    The ethernet header has 2mm spacing. Doesn't change your points though.
    490 replies | 56068 view(s)
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T4.1 ethernet and usb host pin alignments/dimensions 05-11-2021 09:55 PM
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