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  1. Replies
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    In that case, a simple plug-in to read the...

    In that case, a simple plug-in to read the voltage could be written. My breakout board has a serial port header on it so you could use that to get the tip voltage. Sounds pretty easy at first...
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    A THC is in the development stages. Terje, the...

    A THC is in the development stages. Terje, the grblHAL developer is looking at it right now. The T4.1 has more than enough spare cycles. I'm pretty sure he would love to work with you on it. I have...
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    It can use the sd card on the teensy. The best...

    It can use the sd card on the teensy. The best way to use it is to put the card in the teensy and leave it. If you put the machine on the network via ethernet, you can download your GCode to it and...
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    Teensy 4.1 based CNC machines.

    I've posted about my Teensy 4.1 Breakout Board for grblHAL previously. There was some interest in seeing actual machines built with it. So,...

    Here is a show case of grblHAL based CNC machines...
  5. Yes, that doesn't need a beefy driver at all. ...

    Yes, that doesn't need a beefy driver at all. But, I would suggest you look at the TMC step sticks. They are head and shoulders above the others. I was using a 4988 in an astro tracker I made....
  6. Yeah, all those can add up. I've seen it all...

    Yeah, all those can add up. I've seen it all except for returns. Haven't had one yet though I expect it to happen. I do a visual inspection on everything I ship so at least obvious stuff gets...
  7. Thanks. I'll look at the 2113. My Chinese...

    Thanks. I'll look at the 2113. My Chinese assembler has them in stock so it would be easy.

    $10 may be a reasonable price for 1 but you should factor in your time to package and ship. Consider...
  8. On your original question - is there a market for...

    On your original question - is there a market for these? Definitely. You've done a lot of the hard work (including documentation!) so might as well harvest a little reward for it. Tindie is an...
  9. This looks well thought out. Good job. What...

    This looks well thought out. Good job.

    What power multiplexer are you using? I've been looking at the TPS2114/5 for a project I'm doing and have exactly the same problem of the bidirectional...
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    I'm hoping that the UGC and bCNC folks get...

    I'm hoping that the UGC and bCNC folks get grblHAL religion. It is capable of taking significant share from both grbl "classic" and LinuxCNC.

    But, to be honest, java based GCode Senders have...
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    Hi John. Have you tried grblHAL with...

    Hi John. Have you tried grblHAL with compatibility settings? It takes a recompile though I have prebuilt 3, 4 and 5 axis versions on the github page. Or, you can build it yourself from the grblHAL...
  12. Are you saying they took your exact layout and...

    Are you saying they took your exact layout and used that to build their product line? Then you may have a copyright claim against them. If you are saying they liked your idea and built a product...
  13. There's a fine line here. Some companies do have...

    There's a fine line here. Some companies do have an excessive markup on generic stuff but this race to the bottom (line) causes some real problems for electronic products. The whole "Blue Pill" for...
  14. Some cheap servos are pretty "spikey" and can...

    Some cheap servos are pretty "spikey" and can cause glitches on the power rail. Motors and digital logic don't exactly go together well. I usually try to power them from a separate source.

    The...
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    I haven't looked this up but what is the max...

    I haven't looked this up but what is the max recommended impedance of the iMXRT1062's ADC? Good to keep the voltage divider below that.

    If you need a divider that goes above the max, you can use...
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    vj answered the MAC question. I can confirm each...

    vj answered the MAC question. I can confirm each one is unique (or at least the 4 I have are).

    To the IP addr question, if you select DHCP, you get unique IP addrs. (I think that's the...
  17. Yeah, the RAMPS board was never intended to drive...

    Yeah, the RAMPS board was never intended to drive so many steppers and, frankly, is fairly underspec'd for the total amount of power it could draw. The saving grace there is that 3D printers are not...
  18. Thought I posted this but it seemed disappear. ...

    Thought I posted this but it seemed disappear.

    The photo is pretty blurry but it looks correct. 10 mm wide.

    You would run a bare wire right on top of the trace and solder it at each pad where...
  19. OK, sounds good. Sizing the traces is easy -...

    OK, sounds good. Sizing the traces is easy - there are on online calculators for trace width based on copper thickness and current. You don't want more than a 10C temperature rise. Note that you...
  20. Hard to say without a schematic. I would...

    Hard to say without a schematic. I would regulate to 5V for the T4.0.

    You don't want your 5V fighting Vusb so yes, isolate. Especially if it might be 6V...

    How are you interfacing to the step...
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    Yes the German CNC stuff is topnotch! Uber Alles!...

    Yes the German CNC stuff is topnotch! Uber Alles! I'm in the US though about 1/3 of my customers are in Germany.

    grblHAL is definitely "not your father's GRBL". The author, Terje Io, has done an...
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    Lol. There are a number of DM556 clones out...

    Lol. There are a number of DM556 clones out there. In fact, I would be surprised if you can actually buy a real one. As soon as there is any product that sells well, the counterfeits are not far...
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    Yes, please post your progress and feel free to...

    Yes, please post your progress and feel free to contact me directly if you have any questions.
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    Since you have the stepper motors picked out, you...

    Since you have the stepper motors picked out, you should size the drivers to them. But before that, you should probably decide on what voltage you want to run them at. I'd be temped to go to 48V so...
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    My application of the Teensy 4.1 has to interface...

    My application of the Teensy 4.1 has to interface with a lot of 5V stuff. Generally, I look at each I/O and decide how I want to make it work. In the case of outputs, I really like T logic (as in...
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    I like this idea. In the space of the SD card,...

    I like this idea. In the space of the SD card, you could add 25 more pins at a 100 mil spacing. Not saying that's how it should be done but I could see at least 15 more pins. I could certainly make...
  27. One thing I have learned the hard way is to keep...

    One thing I have learned the hard way is to keep my workspace clean. Little bits of wire and other metal pieces have a nasty way of finding themselves onto the bottom PCBs. Also, never power up a...
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    Be careful when soldering the header. There are a...

    Be careful when soldering the header. There are a number of 402 and smaller components near the pads. They come off very easily and manage to vanish once free of the PCB. VoE.
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    The second board (grblHAL Breakout...) does not...

    The second board (grblHAL Breakout...) does not support the Mega formfactor - it uses screw terminals for connections, appropriate for a high vibration milling machine environment.
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    I dunno, ask for sample code or an API.

    I dunno, ask for sample code or an API.
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    Protocol is an overused word - I wouldn't get too...

    Protocol is an overused word - I wouldn't get too worried about. You will have one that allows you to understand your data, it will be transmitted via another protocol and the low level radios may...
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    PPM, to me implies a fairly low data rate though...

    PPM, to me implies a fairly low data rate though my RC knowledge is >10 years old. From the TBS docs, I couldn't see how data is delivered by the receiver. If it is just a PPM signal then I wonder...
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    Sometimes old tech is better left to the...

    Sometimes old tech is better left to the e-cyclers. I would switch to a modern motion control system that has support - I'm guessing you want to use Mach 3. There are lots of inexpensive USB...
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    I've thought about it. But honestly, most of the...

    I've thought about it. But honestly, most of the arduino shields are an exercise super low density. I'd rather create appropriate sized boards that take the Teensy form factors - kind of like...
  35. Well, yes, ESD can kill anything if high enough. ...

    Well, yes, ESD can kill anything if high enough. Do you recall some sort of event that might have lead to a discharge on the board. I'm a little skeptical though.

    I noticed that you have what...
  36. I don't see anything obvious but you have 12V on...

    I don't see anything obvious but you have 12V on the board - I can attest that frys teensys in a heartbeat.
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    Haven't heard. It sure would be good for your...

    Haven't heard. It sure would be good for your board.
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    Yeah, I use JLCPCB too. They are pretty good...

    Yeah, I use JLCPCB too. They are pretty good though their solder mask is quite thin - burns off easily. Makes for ugly rework. I also had to stop using octagonal pads because they would rotate them...
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    OK, that makes some difference. You can generate...

    OK, that makes some difference. You can generate very fast step signals though you might need to write your own code. 500 kHz is possible with some very tightly written code if you are not doing...
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    Power drops off with microstepping. Going even to...

    Power drops off with microstepping. Going even to 1:16 drops the available power. I suppose there are some applications beyond that but don't expect to move anything very heavy. 3000 rpm is way high...
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    300kHz is way fast for a stepper. What driver...

    300kHz is way fast for a stepper. What driver are you using that can go that rate? You can use any pwm pin for outputting to an external driver but a lot of the drivers show a max rate of 200 kHz.
  42. For a non-blocking solution, I would use a timer...

    For a non-blocking solution, I would use a timer to generate 58 uS and 100uS pulses. Set the timer up to generate an interrupt. In the interrupt service routine (ISR) for the timer you set the next...
  43. Without seeing how you wired it up, it's hard to...

    Without seeing how you wired it up, it's hard to tell. What did you connect to what.
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    I have a bunch of ili9341 displays and several of...

    I have a bunch of ili9341 displays and several of them have this issue. One will go white screen after 15-20 minutes of use. I think it's heat related though haven't spent enough time to track it...
  45. The T4 and T4.1 will feel warm to the touch at...

    The T4 and T4.1 will feel warm to the touch at 600 MHz. I've measured the 5 that I have and they all measure around 30C in an approximately 20C ambient room - a 10C rise is really nothing to worry...
  46. I don't think that will work the way you expect. ...

    I don't think that will work the way you expect. That SF converter is for logic, not analog signals. It does not scale the voltage level. If the output signal is truly analog and can read anywhere...
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    It looks like there is a Marlin port for the T3.5...

    It looks like there is a Marlin port for the T3.5 and T3.6. The timer code TimK linked to has ifdefs for both. The iMXRT1062 is overkill and I bet the T3.5 and T3.6 are too. I've thought about...
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    As mark said,yup. Also make sure you get the T...

    As mark said,yup. Also make sure you get the T version (74AHCT541 or 74HCT541) as the HC and AHC versions won't work with 3.3V logic.
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    The 74HCT245 (and 74AHCT245, too) is readily...

    The 74HCT245 (and 74AHCT245, too) is readily available from TI, Toshiba, ON and Nexperia.
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    If you are laying out a board or doing point to...

    If you are laying out a board or doing point to point wiring, you might want to look at the 74HCT541 (or 74AHCT541). Basically the same logic but the '541 has all the inputs on one side of the...
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