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  1. i have had good luck in the past using "surf...

    i have had good luck in the past using "surf boards" that i get from digikey. i usually trim them to remove UN-needed space.
    use very small tip 20 watt iron, pre-tin the board and the part legs, and...
  2. very good idea - could even be extended to two...

    very good idea - could even be extended to two break lines - like maybe dacs closest to cpu and 5v tolerance parts
    out on the end so that if you wanted dacs but didn't need 5v tolerance you use the...
  3. or even a diode so that the voltage is

    or even a diode so that the voltage is <6 new cells and drop is semi constant with current
    either junction for 0.5-0.6 or barrier for 0.3-0.5 volt drop
  4. did some tests three years ago - temp are ir spot...

    did some tests three years ago - temp are ir spot meter looking at top center of cpu while air around board is slowly heated

    at 240 mhz current was 92 ma and ok until top of chip 90 deg c
    at 256...
  5. i don't think he is speaking of the 1170, but...

    i don't think he is speaking of the 1170, but rather a bigger T4 with 1062 mpu

    nice to know 1170 has an internal dac
  6. if there is room i would vote for single or dual...

    if there is room i would vote for single or dual dac similar in performance to tlc/t3.5/t3.6
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    when you say this just after my post it makes me...

    when you say this just after my post it makes me feel guilty!
  8. one or more dac rather than none comes in handy...

    one or more dac rather than none comes in handy for creating pseudo sin waves for modulating a radio. will work over a wide frequency range and
    compared to square waves requires far less external...
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    your Snooze library is fantastic! it will...

    your Snooze library is fantastic!

    it will certainly be welcome when it happens for Teensy4. i have been compiling and running on Teensy4 for 3 weeks now and have become at least a little
    familiar...
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    your voltages look very much like what worked...

    your voltages look very much like what worked here - my final ver tested like this:

    720 75 mv lower than std, 2% reduction in current, about 2.0:1 longer life
    816 100 mv lower than std, ...
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    vcore vs overclock vs life

    am i putting this in the right place?

    just some food for thought... in attempting to fit the data in NXP app note AN12170,
    to an equation, it seems that when warm, T4 mcu life is on average in...
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    i'm sure you know this already, but V0 will not...

    i'm sure you know this already, but V0 will not compile some adc code if target is Teensy LC
    (and i suspect same for Teensy 3.6) altho just fine w Teensy4 (see my earlier post this thread
    re how...
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    thank you for looking on and off - as i said in a...

    thank you for looking on and off - as i said in a previous post - almost of the library code is way above my pay grade.

    the work arounds we have found are good enuf for relatively slow work like...
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    there is a place early in the code where it...

    there is a place early in the code where it watches for a change on the pin - loop label is wtchg or something like that - did not do a timeout on elapsed millis because the radio messages are
    often...
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    in thread "Teensy 4 FreqCount compile error" one...

    in thread "Teensy 4 FreqCount compile error" one of the posts has a github link
    you only have to do minor editing to 2 files in the lib and then T4 under 1.48
    will compile FreqCount functions
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    i got in too big a hurry doing editing of post...

    i got in too big a hurry doing editing of post #25 this thread - did some "harmless" editing that i posted and did not compile it (sloppy sloppy)

    of the two pgms in post 25 the first pgm (does not...
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    i agree, however, i have glanced thru the library...

    i agree, however, i have glanced thru the library files and can only say - way above my pay grade.

    i think you or some other professional programmer will have to tackle that.
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    these are the codes i am testing with lately ...

    these are the codes i am testing with lately

    after you tie the two input pins together per the comments near top of code, apply sq wave 0-3.3 or 0.1-2.8 v fin there
    t4 10k series each pin then...
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    here is an update to post #20 this thread: ...

    here is an update to post #20 this thread:

    caught TLC w first two FreqMeas measurements that did not match once in a blue moon so:

    TLC 48 mhz smallest 40 microsec delay after last ..begin ...
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    confused

    i am confused by post 2 and 3 - the whole reason i created "FreqCount caution" was to call attention to the FreqCount funny
    whereas post 2 and 3 focus on FreqMmeas which maybe belong under "teensy4...
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    FreqCount caution

    after running several hundred cold starts the 100% safe thing to do is on FreqMeas, delay for 40 microsec just after ...begin AND do two dummy cycles before real measurements,
    this only costs about...
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    after running several hundred cold starts the...

    after running several hundred cold starts the 100% safe thing to do is on FreqMeas, delay for 40 microsec just after ...begin AND do two dummy cycles before real measurements,
    this only costs about...
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    it took me so long to get back to the bench that...

    it took me so long to get back to the bench that you had already run and improved the code you had posted in post #13.
    but my results with it were first one or two samples in error then all ok and...
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    here is a piece of t4 code that shows the fmeas...

    here is a piece of t4 code that shows the fmeas problem i am seeing,
    and seems to at least isolate the nature of the problem. and turns out
    tlc does it too - in my old application it was...
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    the number returned has terrible wander - ie not...

    the number returned has terrible wander - ie not repeatable - as if the timer is not getting reset each time or is not synchronized

    that output is listed in the orig report

    a couple of posts...
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    manitou, thank you for the feedback ...

    manitou,

    thank you for the feedback

    defragster,

    thank you for the feedback

    i ran the code you were nice enuf to post w 22 and 23 tied together - ran fine very near 800.0 every time
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    ok pin 22 is still correct - makes sense, when i...

    ok pin 22 is still correct - makes sense, when i turn the generator off dead standstill for awhile
    i tried 500 hz 1000 hz and 1500 hz - all wander terribly as if the internal timer is not getting...
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    it just dawned on me that not everyones arduino...

    it just dawned on me that not everyones arduino will use main (tls and t3.6 do it and one of the senior members showed me what
    to edit so t4 will do it too) so i can pull up old pgms and compile t4...
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    what is IDE format ? that was select all then...

    what is IDE format ? that was select all then copy in arduino ide, paste to notepad, flash drive, web computer, paste into
    the post - that was what i ran to get the output you see. or are you...
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    Teensy 4 FreqMeas problem ?

    in the code below which is mostly stolen from and old Teensy LC program that works fine,
    the output seems to wander around (see output below). this happens with and w/o waiting
    for an edge, with or...
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    i have used Bumblers' V0 adc library (search in...

    i have used Bumblers' V0 adc library (search in technical for "adc") to get 12 bit conversions in about 0.8 us
    going 10 or 8 bits speeds it up some but not a lot.
    since that is your low end i think...
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    i have a pgm running that uses good sine...

    i have a pgm running that uses good sine generator and float fft to "test" the T4 adc
    doing 8 time domain data sets averaged with adc hardware averaging of 8, and
    HIGH_SPEED for t convert and t...
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    Teensy 4 FreqCount compile error

    this report concerns Teensy4 and FreqCount library
    win7x64,Arduino 1.8.5, Teensyduino 1.48 release

    compiles well if choose TeensyLC 48 mhz smallest.
    i do not know how to get the compile listing...
  34. Teensy 4.0 results in small enclosure

    spacing in final post not what i had after pasting text in - not sure how to prevent that
    maybe i should attach a text file next time


    FYI - here are some results for T4 in a small sealed...
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    Bumbler, V0 works well. took some code that...

    Bumbler,

    V0 works well. took some code that does interval timer driven 12 bit manual conversions (value=adc->analogRead(readPin)
    every 4 microseconds (250 khz). In the T3.6 at 180 mhz atod...
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    Sticky: Kurt, got away from it a few hours and found my...

    Kurt,
    got away from it a few hours and found my oversight - works just fine this end
    win7 pro x64, arduino 1.8.5, teensyduino 1.48 release, setup w loop or just main
    both work with teensy4.
    ...
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    Sticky: Kurt, no joy trying to duplicate, copied...

    Kurt,
    no joy trying to duplicate, copied main.cpp from teensy3 dir to teensy4 dir

    edited starup.c



    near top startup.c
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    Sticky: thanks for taking the time for that - i will try...

    thanks for taking the time for that - i will try to duplicate this end
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    Sticky: you will be impressed yes - at a glance the...

    you will be impressed

    yes - at a glance the 133 looks big but the clk/iq stays fairly constant - the proportionality only
    grows 10 percent over that range

    89/600 = 0.148 110/720 = 0.153 ...
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    Sticky: Kurt, i am a dummy - after seeing your post i...

    Kurt,
    i am a dummy - after seeing your post i realize that the error messages should have led me where i needed to go,
    but since i had not ever been using setup() and loop() for the last two years...
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    Sticky: i think i see your point - i will dump using...

    i think i see your point - i will dump using main() - it is not that much trouble to go back to main() when testing under GNU C on the PC
    thanks for the feedback
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    Sticky: Kurt, please see my previous post - most...

    Kurt,

    please see my previous post - most Teensy will do main() but not t4.0 yet - needs setup() and loop()

    that's ok - the massive speed increase is worth having to make changes when using GNU...
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    Sticky: you were right - t4 cannot use main() - must use...

    you were right - t4 cannot use main() - must use setup() and loop()

    fyi- teensy lc,3.5,and 3.6 are all ok with main() - so i just thought that it was a given
    thank you having such insight - the...
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    Sticky: i had no idea that could be teensyduino. i will...

    i had no idea that could be teensyduino. i will re-do one of the two cases with setup() and loop() and report results.

    thank you for the feedback
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    Sticky: another case of arduino 1.8.5 and teensyduinod...

    another case of arduino 1.8.5 and teensyduinod 1.48 released never compiles- at least nothing i have tried will compile.
    running win7 pro x64
    first case i posted was earlier today - maybe 4 posts...
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    Sticky: main() in Teensy 4 bug example

    hi Kurt,

    i just got tired of having to make slight code changes between Arduino and GNU C compiler on the PC
    (i test what i can on the PC) so i tried to see if Arduino would take a standard...
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    Sticky: hi all, is this the right place to put this ?...

    hi all,
    is this the right place to put this ?
    this code compiles/runs fine teensy3.6 180 mhz debug (debug only)
    but crashes during compile for teensy4.0 600 mhz debug
    am running win7pro 64 bit,...
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    thank you. fyi - to do and changes to 148b1 text seem to be empty?

    thank you. fyi - to do and changes to 148b1 text seem to be empty?
  49. upgrading Teensyduino - can anyone help please

    I have been running Arduino 1.8.5 and Teensyduino 1.41 under win 7 64 bit for two years and want to
    upgrade to Teensyduino 1.47 so I can use Teensy 4.0.

    There does not seem to be an uninstall in...
  50. Sticky: Here are a couple of details that help keep...

    Here are a couple of details that help keep TeensyLC hibernate current
    as low as possible. a) before hibernate delare pin 17 as output and
    write a high or low to it to prevent the input of the...
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