PhilB
Senior Member

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...

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...

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...

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)...

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...

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...

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.

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...

What are you trying to do with the teensy? Do you need Ethernet or Host USB? Probably the easiest breakout is a solderless breadboard.

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...

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...

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...

$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...

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...

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...

Looks like it does not support the Ethernet and Host USB headers. That is a reasonably good price, though.

The ethernet header has 2mm spacing. Doesn't change your points though.

Tindie is a reasonable place to do it. I've been using Tindie and have sold over 300 units so far in 8 months. It was a little bit of a nail biter when I ordered my first batch of 50 boards but they sold out in a...

Yes, the SKR E3 is the one that I was thinking of. I see them on Amazon, eBay and AliExpress. I don't know if they have been counterfeited yet but better to buy from a known supplier. The other pieces (like the LCD)...

Interesting project. Since you aren't going to be able to control all 500 motors directly from a processor, you will need some sort of distributed control. I assume you've already figured that out but it leads to...

I don't quite understand the application here but do the relays have the same make and break times? If not, it is likely that when you go from, say, 0110000 to 0001000 there is a period of 0111000 or 0000000? It makes...

By the way, the latest main repository version in conjunction with ioSender has a new grbl settings report. It is far superior to the old bit-field approach and organizes the settings by area rather than the seemingly...

Hi, sorry I missed this earlier. bCNC on a RPi works well with grblHAL though you should have the latest bCNC version as there have been some fixes along the way. I've tested on a RPi3 and RPi4. Part of the problem...

For a controller, you might want to look at the Big Tree Tech LPC board. Marlin 32 support. They occasionally have some quality issues but are not expensive.

It is a huge departure for PJRC (from BB friendly boards) and doesn't really bring out new features. Is there a cost advantage? Given that you need a base board and based on Sparkfun prices, the answer looks to be no....

I got my RP2020 MMod boards yesterday. Haven't done anything with them yet, though.

Shaken, not stirred.

Gawd no! You did nothing wrong and I'm sure Paul and Robin knew about it anyway.

Somebody broke embargo! Interesting. Is that an ethernet Phy I spy? (on second thought, probably not)

The Teensy format (AKA Stamp) excels for breadboarding use. This is one reason why Teensys have been so popular. (Though, by far not the only reason) I've looked at micromod and concluded it buys me very little. ...

As I understand it, any of the TMC drivers that can run on 3.3V or 5V are affected by it. PFET is not a bad idea at all. I've been through a lot of TMC driver datasheets (2208, 2209, 2130, 5160) and did not see...

You know about Teensyduino? Except for MCU peripherals, it should mostly be a recompile.

Yeah, feces occurs. I blew another T4.1 the other day because I soldered in the wrong MagJack on the base board and it literally blew the top off of the Phy chip.

To be honest, I don't quite get what you are trying to do. Based on grblHAL, the teensy 4.1 is capable of handling at least 5 stepper (step/dir/enable) outputs at once using hardware PWM. 600 kHz step rates are...

Need 8 ports? pretty uncommon. But need 12-16 more GPIO pins? Way more likely. And LCD pins? Hell yes. I'd love to see a Teensy 4.0 format with 2 rows of pins on either side. Put the less needed functions on the...

Your servo error outputs will need to be open collector. Most of the error outputs I have seen are OC and pull the signal low on an error. If you want to wire OR them, you will need to set the EStop input to NO. ...

I look forward to seeing the results of your efforts. A number of my customers using servos bring the error signal into EStop. There is a movement to bring out another input signal - Servo-Alarm on an unused Limit...

The I/O on the current board (V 2.09) is pretty much the same as earlier versions. I will put up a schematic of it on github. here ] Yes, you can use either USB or Ethernet to communicate with the Ethernet version...

A couple of things spring to mind. What is your ADC sample rate? That will define your observed "best case rise time". Do you have pin 1 and 2 connected together - if not, it probably forms a capacitor when...