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  1. I have looked at sensing soil moisture to control...

    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,...
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    I have been spending some time with the RasPi...

    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...
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    I'm using the 6N137 on a Teensy's output. The...

    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...
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    If you get a board built by JLCPCB, please write...

    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.
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    Actually, JLCPCB has a number of MagJacks that...

    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...
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    What are you trying to do with the teensy? Do...

    What are you trying to do with the teensy? Do you need Ethernet or Host USB? Probably the easiest breakout is a solderless breadboard.
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    I have been thinking about this idea in the...

    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...
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    Some details to be worked through. Assuming you...

    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...
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    but ot can be fun. I blame it all on Monster...

    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...
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    $1000? Try used for $6499.00 + $80 shipping. The...

    $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...
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    Yeah, that one corner is a bit tight. When 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...
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    I like the look of the KaRo compute modules....

    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...
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    Looks like it does not support the Ethernet and...

    Looks like it does not support the Ethernet and Host USB headers. That is a reasonably good price, though.
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    The ethernet header has 2mm spacing. Doesn't...

    The ethernet header has 2mm spacing. Doesn't change your points though.
  15. Tindie is a reasonable place to do it. I've been...

    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...
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    Yes, the SKR E3...

    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...
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    Interesting project. Since you aren't going to...

    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...
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    I don't quite understand the application here but...

    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...
  19. By the way, the latest main repository version in...

    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...
  20. Hi, sorry I missed this earlier. bCNC on a RPi...

    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.
    ...
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    For a controller, you might want to look at the...

    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.
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    It is a huge departure for PJRC (from BB friendly...

    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...
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    I got my RP2020 MMod boards yesterday. Haven't...

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

    Shaken, not stirred.
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    Gawd no! You did nothing wrong and I'm sure Paul...

    Gawd no! You did nothing wrong and I'm sure Paul and Robin knew about it anyway.
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    Somebody broke embargo! Interesting. Is that an...

    Somebody broke embargo! Interesting. Is that an ethernet Phy I spy? (on second thought, probably not)
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    The Teensy format (AKA Stamp) excels for...

    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...
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    As I understand it, any of the TMC drivers that...

    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)...
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    You know about Teensyduino? Except for MCU...

    You know about Teensyduino? Except for MCU peripherals, it should mostly be a recompile.
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    Yeah, feces occurs. I blew another T4.1 the...

    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.
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    To be honest, I don't quite get what you are...

    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...
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    Need 8 ports? pretty uncommon. But need 12-16...

    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...
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    Your servo error outputs will need to be open...

    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...
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    I look forward to seeing the results of your...

    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 -...
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    The I/O on the current board (V 2.09) is pretty...

    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. [edit: here ]

    Yes, you can use either USB or Ethernet to communicate...
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    A couple of things spring to mind. What is your...

    A couple of things spring to mind. What is your ADC sample rate? That will define your observed "best case rise time". [edit: the adafruit ADC max speed is 860 samples per second so you will never...
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    Moderator Appreciation

    I have been around the internet, even before it was the internet and seen all sorts of forums come and go. One thing that always stands out is the difference between good moderators and bad ones. In...
  38. If you use light "tunnels" on both emitter and...

    If you use light "tunnels" on both emitter and receiver you can eliminate extraneous radiation (i.e. light and IR). The two tunnels have to be aligned. I have used drinking straws and epoxy.
  39. Why not use IR beam break? And you could use a...

    Why not use IR beam break? And you could use a remote control IR receiver as a way to reject external/extraneous IR. Shield the beam from the crow's sight.

    Another approach, create a small...
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    From the 4N25 data sheet, the LED has a Vf of...

    From the 4N25 data sheet, the LED has a Vf of around 1.1V at an If of 10mA - range looks to be 1 to 1.25V. So with a 200 ohm resistor and 2.2V (3.3V - 1.1V) you get 11 mA. A bit high for a Teensy. ...
  41. Thread: 5V Teesny 4.1

    by PhilB
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    Yes, microcontrollers are all 3.3V these days....

    Yes, microcontrollers are all 3.3V these days. You've got to learn to live with it. While most peripherals can be had in 3.3V versions and a lot (almost all) new peripheral chips are 3.3V (or less)...
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    That is really nice. I use a toaster oven for...

    That is really nice. I use a toaster oven for reflow but it is a bit of a hassle and takes up a lot of bench space.

    What are you using to measure the temperature? Is the quad encoder built into...
  43. Thread: I2c eeprom ??

    by PhilB
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    If you use FRAM, you can eliminate the write...

    If you use FRAM, you can eliminate the write delays.
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    Two answers to this question: - The board will...

    Two answers to this question:
    - The board will take a 3.6 as it has the power/gnd/Serial/I2C pins in the same locations as the T4.1. I haven't tried it, though. It will not work for ethernet,...
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    That circuit has 2 big red flags for me -...

    That circuit has 2 big red flags for me - directly driving relay coils from the processor pins and no flyback diodes. It also seems odd to be using relays to drive LEDs but that may just my bad...
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    Yes, that certainly can work. The communication...

    Yes, that certainly can work. The communication protocol for grblHAL is basically the same as the original Grbl with a few additions. You will want to read up on streaming data to Grbl it can run at...
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    Compat means compatibility mode is set so you can...

    Compat means compatibility mode is set so you can work with senders that can't handle anything but the original Grbl. The good news is the big ones (UGS and bCNC) run will without compatibility...
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    Glad it worked out. So many times what looks...

    Glad it worked out. So many times what looks like a dead board is because of crap cables or power supply or broken PC or ...
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    Hmmm. I have seen this before and always was...

    Hmmm. I have seen this before and always was able to get it to respond. If it is blinking, the teensy is running the blink sketch so it is getting power from the USB cable and functioning enough to...
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    No problem with the ethernet pins. The 5 pin...

    No problem with the ethernet pins. The 5 pin header (actually both 5 pin headers) does not need to be soldered.
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