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  • Talkiet's Avatar
    12-30-2021, 08:51 AM
    Thanks. It's not the end of the world as anything less than perfect needs to be compensated for in my application - I need ms synced separate units, but might be worth noting somewhere on the specs somewhere as it's...
    92 replies | 17110 view(s)
  • Talkiet's Avatar
    12-30-2021, 02:14 AM
    Just noticed that you also have a 40ppm T4.1 (although a micromod)... My most recent post in this thread shows that yes, I have different crystals on two fullsize T4.1s... It seems that some of the crystals are out of...
    92 replies | 17110 view(s)
  • Talkiet's Avatar
    12-30-2021, 01:55 AM
    In fact, checking under a microscope seems to show both the 24Mhz and 32.768kHz crystals are at least visually different on the two types of T4.1 I have that are giving in and (apparently) out of spec crystal...
    92 replies | 17110 view(s)
  • Talkiet's Avatar
    12-30-2021, 01:24 AM
    Interesting... a 3rd T4.1 and this time I get the ticks evening out at about 999990 ticks, while the first two were both around 999960... This one was bought at a different time. I will try them all in the same board...
    92 replies | 17110 view(s)
  • Talkiet's Avatar
    12-19-2021, 02:13 AM
    I did sub in a second T4.1 (purchased at the same time as the first, from Sparkfun) and got results very closely aligned with the first example (40.2 - 40.6 ppm) It doesn't really worry me as I am moving to a new...
    92 replies | 17110 view(s)
  • Talkiet's Avatar
    12-18-2021, 04:38 AM
    This T4.1 behaved the same when just hooked up with jumpers (eth port was on it's own little breakout)... I do have quite a few T4.1s and based on your comment I will swap a few in over the next few days and see how...
    92 replies | 17110 view(s)
  • Talkiet's Avatar
    12-14-2021, 09:23 PM
    Thanks for the pointer, the other 2 don't appear to be broken out on the T4.1 (GPIO_AD_B0_14 and GPIO_AD_B0_10)... I'll not bash my head against that brick wall any longer and embrace pin35 with a selectable trace on...
    92 replies | 17110 view(s)
  • Talkiet's Avatar
    12-14-2021, 09:01 PM
    Ahh, thanks for that - I wasn't aware that there were limited working permutations and the pin was dictated by the hardware design. As it happens I just soldered a wire from PPS to Pin38 on the Teensy socket and cut the...
    92 replies | 17110 view(s)
  • Talkiet's Avatar
    12-14-2021, 01:54 AM
    I have managed to get this working great myself however I have some general purpose boards I have made up with eth, buck converters and sockets for GPS, buzzer, BT module etc and my PCB uses pin 38 for PPS, not pin35. I...
    92 replies | 17110 view(s)
  • Talkiet's Avatar
    12-04-2021, 02:26 AM
    Coming back to this - I put a 100nf cap across the input and this has tamed the behaviour sufficiently. It looks ok on the scope now and I am not seeing any phantom triggers in the normal program execution. Cheers - N
    9 replies | 552 view(s)
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Teensy 4.1 NTP server 12-30-2021 08:51 AM
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