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    This is great to hear, Paul. I'm eagerly awaiting...

    This is great to hear, Paul. I'm eagerly awaiting it! Thanks so much for the update.
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    That's true! I think that gives it capabilities...

    That's true! I think that gives it capabilities on par with the J-Link EDU/BASE, if I remember correctly what I read about it a few weeks ago (which I probably don't).
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    Yeah, honestly they look great, but I was turned...

    Yeah, honestly they look great, but I was turned off by the fact that J-Flash software requires a J-Link PLUS at minimum, which is $600. I might pick up an EDU model to play with, but I'd be tempted...
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    I agree, and I plan to make some (of the things...

    I agree, and I plan to make some (of the things you mentioned) if this project works out well. My previous take on that was this: https://forum.pjrc.com/threads/52751 but the form-factor was never...
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    Yeah, I had the same thinking. Using the Teensy...

    Yeah, I had the same thinking. Using the Teensy is great for development, and even for small runs of things, but it's not ideal to integrate into a product, due to space, headers, mounting, etc. And...
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    Thanks! I hope it ends up being viable for...

    Thanks! I hope it ends up being viable for production use with or without the PJRC bootloader! If the LPC-Link2 works out, then we're talking about a $20 programmer and a <$50 programming fixture.
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    Thanks! I'm inclined to agree with you, except...

    Thanks! I'm inclined to agree with you, except that I've really come around to the option of having the bootloader on-board. Obviously this variant won't actually be available for a while, until the...
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    Here are some some board and footprint drawings...

    Here are some some board and footprint drawings of the current design (units are mm):

    1889218893



    Timeframe for a beta is probably 6-8 weeks. The current revision is going to start being...
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    Here's an update! A new revision is all routed...

    Here's an update!

    A new revision is all routed up and ready to go.

    I stuck with my previously-posted layout and overall size of 14.5 x 25.5 mm:

    18729 18730

    Here's the current pinout:
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    Yes, this is very cool. I'm pretty sure at this...

    Yes, this is very cool. I'm pretty sure at this point that the Teensy bootloader chip will be optional.

    I've just picked up an LPC-Link2 board (aka Embedded Artists EA-XPR-200, only costs $20) for...
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    Thanks! Perhaps you'd like to be a beta tester?

    Thanks! Perhaps you'd like to be a beta tester?
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    Nah, I'm not into selling stuff that I don't have...

    Nah, I'm not into selling stuff that I don't have on-hand yet. They'll go up on Tindie when they're actually ready to ship. Timeframe for assembly is ~1 month.

    In the meantime, if you're...
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    So, I think with USB, SD, and CAN all confirmed...

    So, I think with USB, SD, and CAN all confirmed good, I'm about ready to pull the trigger on the first batch of kits.

    Any last-minute thoughts or feedback?
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    Awesome! :D Thanks

    Awesome! :D Thanks
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    I've ordered them from PCBWay (pcbway.com) and...

    I've ordered them from PCBWay (pcbway.com) and ALLPCB (allpcb.com).

    At a quantity of 100 pcs, the latest batch was $0.68/pc from ALLPCB. They don't quote flex cables online, you have to email...
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    Sure thing :)

    Sure thing :)
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    This is great feedback so far! I'm glad...

    This is great feedback so far! I'm glad everything seems to be working as it should be.

    Regarding the kits, I'm planning to have them come pre-assembled (soldered) with the following parts...
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    At the moment, it's just 100% solder mask...

    At the moment, it's just 100% solder mask (blank), no components.

    However, I might add (JTAG + power + USB) test points to facilitate programming with a pogo pin fixture.
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    So, I haven't tried re-routing this yet, but I do...

    So, I haven't tried re-routing this yet, but I do like the new layout and size.

    I removed the exposed pad on the QFN after doing some research...
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    This might be an ignorant response on my part,...

    This might be an ignorant response on my part, and this question may have already been discussed elsewhere, but... upon first glance:

    Wouldn't a momentary switch (going to GND) connected to the...
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    Well, I had a change of heart about this, for a...

    Well, I had a change of heart about this, for a few reasons, including those you mentioned. Mostly, the added complexity of using both modules together (T2M + a seperate bootloader board) and an end...
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    Because they’re not yet capable of initializing...

    Because they’re not yet capable of initializing an off-the-shelf i.MX RT1062. PJRC has a custom fixture to do it at the moment. Paul has said he is planning to update the bootloader code to support...
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    I'm thinking of something like this for the...

    I'm thinking of something like this for the bootloader board.

    18519

    This is 12 x 6 mm. The pads are a bit larger, 0.5 mm drills with a 1.5 mm pitch.

    This one could be easily made with the...
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    Thanks! :) I think you make a very good...

    Thanks! :)



    I think you make a very good point here. They were another size/convenience compromise, but they take up too much space for the amount of convenience they provide (not much). I've...
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    My local post office hardly ever scans packages,...

    My local post office hardly ever scans packages, so the first scan will usually be from the sorting center in Springfield, MA a few days after they've been dropped off. It's annoying, but at this...
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    T2M, an Embeddable Teensy Module (WIP)

    I've been working on this as a tangent, and it's time for me to get some feedback (and help) if anyone is interested. Here goes.

    Note: This is not a finished/working project, but rather a...
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    Likewise! I'm happy that the latest beta boards...

    Likewise! I'm happy that the latest beta boards to go out are timed nicely to be holiday presents :)
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    All the new boards (and parts, as requested) were...

    All the new boards (and parts, as requested) were shipped out today!
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    Yeah... so... this is why I need to stop ordering...

    Yeah... so... this is why I need to stop ordering PCBs at 4 AM...

    Now that I see it, I know exactly why I made this mistake too!

    I think I'll keep the flex cable as-is and fix this on the...
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    For what it's worth, the PCBs do (supposedly) go...

    For what it's worth, the PCBs do (supposedly) go through electrical testing via automated flying probe machines at the board house, in order to weed out any defective ones before they're shipped.
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    Oh, you're lucky. We had one RadioShack here in...

    Oh, you're lucky. We had one RadioShack here in western MA for a while. Then it closed and re-opened as BRW Electronics (I think that's what it was called?) which was only open for a year or two...
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    Thanks for the report, and I'm glad to hear that...

    Thanks for the report, and I'm glad to hear that it mostly went well. I'm very curious to see photos of the socket issue, because I just assembled one with the socket kit and it went pretty smoothly....
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    You're welcome! They're in-progress. I'm...

    You're welcome!



    They're in-progress. I'm experimenting with Dozuki's free offering (think iFixit) for step-by-step instructions with photos.



    This happens to me all the time. And every...
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    Yes, very much so! As you can see from the...

    Yes, very much so!

    As you can see from the replies, it's in the second round of beta testing right now.
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    Hey Paul, thanks for the quick reply. Appreciate...

    Hey Paul, thanks for the quick reply. Appreciate it!

    I'm very eagerly awaiting the updated bootloader for one of my projects.
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    Teensy 4.0 Bootloader Chip Question

    Hi there,

    I'm wondering if the Bootloader Chips for sale on the PJRC store (part number IC_MKL02Z32_QFN16, https://www.pjrc.com/store/ic_mkl02.html) support booting the Teensy 4.0 (aka the NXP...
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    Yeah, it'll be interesting to see how this one...

    Yeah, it'll be interesting to see how this one goes.

    You'll notice that I added two white line markings onto this version of the flex cable. They're designed to align with the existing white lines...
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    I changed the SD card socket. I have a feeling...

    I changed the SD card socket. I have a feeling that some of you are going to be very happy about this.

    The new one doesn't have any overhang, so it should be much easier to solder. It's slimmer...
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    Thanks, this is great. So, what's your opinion...

    Thanks, this is great.

    So, what's your opinion about the ALT5 column in the PIN MUX table then?

    Should it be left as-is:

    GPIO1_IO03
    GPIO1_IO02
    GPIO4_IO04
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    Got it. Thanks!

    Got it. Thanks!
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    Adobe Illustrator :)

    Adobe Illustrator :)
  42. Replies
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    An updated pinout card for the new revision. ...

    An updated pinout card for the new revision.

    PDF: 18205
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    PM'd both of you. Thanks! You won't have to...

    PM'd both of you. Thanks!

    You won't have to order any parts. They'll be included :D
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    I think it will be easiest to solder the SD...

    I think it will be easiest to solder the SD socket first, but it will also be easier now that the pads are longer too. I'm going to do some experimenting. This round will have step-by-step assembly...
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    With the re-ordered USB host pins and the added...

    With the re-ordered USB host pins and the added second (USB host power) switch:
    18198 18199
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    Yikes! I totally forgot about this. Now I...

    Yikes! I totally forgot about this. Now I remember why those two GND pins were next to each other. I've put them back in order.



    The TPS2055A does have an EN pin, and I just had it connected to...
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    Ok! So, in preparation for ordering a new...

    Ok!

    So, in preparation for ordering a new batch, I made some more changes:


    Replaced the TPD3S014 chip with the TPS2055A chip, as requested, which is larger and should be easier to solder.
    ...
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    Sounds great, thanks very much!

    Sounds great, thanks very much!
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    Sounds great! Yes, I'll include a socket kit too....

    Sounds great! Yes, I'll include a socket kit too.



    Probably not, since the previous A3 revisions were never manufactured. This will stay at A3 until fab'd.



    Great to hear!
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    I'm not sure about this change, and even less...

    I'm not sure about this change, and even less sure after reading the response by @KurtE ...



    This is a great suggestion, and I've updated the chart!

    PDF: 18193

    Low-res raster preview...
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