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  1. Replies
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    I have received different boards from the...

    I have received different boards from the supplier MichaelMeissner mentioned earlier on this thread (https://www.tindie.com/products/loglow/teensy-3536-breakout-revision-a-dip-64/). I can confirm...
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    That was my understanding as well, that is why I...

    That was my understanding as well, that is why I pointed out that schematics is identical. Taking it as starting point OP can experiment with pullups and mosfets to get required switching time. Of...
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    I might be missing something but the schematics...

    I might be missing something but the schematics of Pololu level shifter is identical to Sparkfun one.
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    Another option is mosfet-based circuit like this:...

    Another option is mosfet-based circuit like this: https://www.sparkfun.com/products/12009. Don't know about "recommended" but it is widely used one.
    Also, depending on input impedance and voltage...
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    Looks like OP and Paul agreed on the conclusion...

    Looks like OP and Paul agreed on the conclusion of this thread. That's good, but before we part I'd like to propose a little experiment. Just ask yourself these three simple questions:

    1. How...
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    I thought the whole point of the OP idea was to...

    I thought the whole point of the OP idea was to have ONE form factor covering most of the use cases. And the best part of it was that it did not even require any alternative routing.
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    that is not a problem at all. You have 3 options...

    that is not a problem at all. You have 3 options here:

    1. If you do not need servo connections you do not solder in those pins. As simple as that.

    2. If you want servo connections AND...
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    If all MCU pins are routed to Teensy pins then...

    If all MCU pins are routed to Teensy pins then you'll be hard pressed to find a case where multiplexing like that is necessary. And that is exactly the reason for OP suggestion. And yes, in most...
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    This is exactly the kind of controller layout I...

    This is exactly the kind of controller layout I had in mind when I posted on the carrier board thread.

    The logic is simple - there are two typical uses for controllers: breadbording/prototyping...
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    I might be missing something obvious here, but...

    I might be missing something obvious here, but from all I see I got the impression that you are trying to GUESS actual servo position:

    if (servoActualPosition < servoTargetPosition) {
    ...
  11. Just to clarify previous post: It is not a...

    Just to clarify previous post:

    It is not a good idea to use 5V I2C bus with 3.3V master device, even if master has 5V tolerant pins. It might work, but you can also fry it in the long run. What...
  12. I am still puzzled by this and similar statements...

    I am still puzzled by this and similar statements in earlier posts. What do you mean when you talk about "adding larger resistor"? No matter how large resistor is, adding it in parallel will REDUCE...
  13. Wait a second, this wasn't clear in the original...

    Wait a second, this wasn't clear in the original post. So you have pull-ups in the shifter AND in the device it is connected to? 10K + 2.2K in parallel?
    Then the only option you have is to remove...
  14. In all my searches on I2C I would eventually land...

    In all my searches on I2C I would eventually land at TI document written long time ago which gives formulas for allowed resistor range. Unfortunately it uses line capacitance that is not easy to...
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    I oversimplified a little, of course. Yes, some...

    I oversimplified a little, of course. Yes, some code to initiate programming condition either on reset or, for example, on interrupt from one of no longer used jtag pins. So, you are right, it is not...
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    Wow, I am obviously out of my comfort zone here....

    Wow, I am obviously out of my comfort zone here. I did not know that you can run code from RAM, for example. That of course would allow user code to occupy entire flash.

    But is "NON-Teensy"...
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    This idea came to my mind right after I made a...

    This idea came to my mind right after I made a post. It is my understanding that MKL02 checks MK20 upon power up and uploads bootloader code if it is missing. Therefore it should be possible to...
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    Facing similar problem I wrote a library with...

    Facing similar problem I wrote a library with several filters that could be daisy-chained and tried them in various combinations and with different settings. In the end I'd given up on low-pass...
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    Bootloader sequence

    Is there a detailed description of the bootloader functionality somewhere? I found bits and pieces in several threads but they provided more questions than answers. I am not asking for bootloader...
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    Thanks for the explanations, Paul. I totally...

    Thanks for the explanations, Paul.

    I totally forgot about that additional possibility for current path - from 5V rail through upper mosfet to 3.3V rail. So, not only lower mosfet can be fried by...
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    Hi Paul, Thanks for prompt reply. Since I am not...

    Hi Paul,
    Thanks for prompt reply. Since I am not building any fancy circuits I think there is no point in a new thread. I am simply connecting controller to off-the-shelf external devices, like...
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    My apologies for digging up this old thread but I...

    My apologies for digging up this old thread but I really need to understand this before committing to new hardware and abandoning a lot of code accumulated over the years.
    I've been using ATmega...
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    Let me add another 2 cents to the whole lot of...

    Let me add another 2 cents to the whole lot of good (and sometimes contradictory) suggestions here.

    There was a suggestion to add pads for i2c pull-ups in the beginning of the thread. I second...
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    Hi Frank, Your board is nifty but as I mentioned...

    Hi Frank,
    Your board is nifty but as I mentioned before, I do not work with hardware directly, I am writing software for it. The guys I am doing it for do not bother with soldering, they are focused...
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    I asked for 21 because breakout board adds 20....

    I asked for 21 because breakout board adds 20. Hmm... actually 14 might be OK, it covers 12 pads and reset. So only 2x7 extra holes, 5.1 mm extra length. Even better!

    Oh, and I am removing a...
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    Yes, that is exactly what I had in mind, Michael....

    Yes, that is exactly what I had in mind, Michael. Except with 21 holes (14 do not cover all necessary connections) and without turning neat teensy board into another Frankenstein's monster as all...
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    After some thinking, I'd like to clarify my...

    After some thinking, I'd like to clarify my suggestion for making full pinout teensy. To keep in line with the goal of having tiny board, I think the best option is to:
    stretch the board just enough...
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    In my experience most of the uses for...

    In my experience most of the uses for micro-controller boards like teensy fall into two primary categories. First, breadboarding various experiments, trying new things and developing software. For...
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