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i have a drone w gps - very small antenna. outdoors lock 3-4+ sat usually takes 1-2 minits.

indoors (tile roof) often takes 5-6 minits

and as jonr says, once it has aquired, i can carry it...

a friend of mine used to produce and sell those 30-40 years ago.

as i remember he used a pin diode optical sensor to detect a fast rising or falling edge as the bullet went over the traps.
rising...

speaking of whisker growth - do your homework before your last cleaning of the board,
some components of some cleansers/solvents that get left behind will actually accelerate
whisker formation and...

that hib current for tlc is way too high - should be a few ua

there are several things that lower the hib current - most important is to set pin 17 or whichever is the
"5v out" pin to be an...

i agree that it would be hard for that to cause 20ms. i also agree that 20ms is a long time - especially on T4
you may have to break down and write a super simple code that does nothing other than...

if (who== PIN_AX) {
if (AuxHigh()) digitalWrite(13,HIGH);

if you you change above to be digitalWrite(13,HIGH); leaving off the if auxhi does it help?

the logic anal display does not show that clear on my display. are you timing from when the aux pin goes
on the rcvr or from when you begin or end the serial stream into the transmitter? which...

i think i remember seeing a post by Paul S a year or so ago discussing how NXP had a small register to control to trise tfall
time for i/o pins (they had EMI reduction in mind) so software timing...

had overlooked on the schematic -non inverting input of lm324 at ground - will not work as desired that way.
non inverting input would have to be at 1.65 or so volts for proper action.

edit - is...

the lm324 has restricted input voltage common mode range - 1.7 v from +supply and
0v from -supply so if it is powered from 5v the inputs can go as high as 3.3 with no
tolerance and no margin. the...

luni's advice to stock so as to bridge the gap is a good one, altho you have probably waited too long.
i have been designing hardware since 1975 and in the old days you could actually avoid single...

seems feasible to me - give it a go. i had similar doubts about using Teensy LC to produce nice pseudo sine
waves at up to 2 khz for modulation of an RF carrier (rather than sq waves to reduce...

sometimes - i just last week had to remove one pole after an op amp and before adc input on t4 to get
a 3-6 db improvement in signal to noise. the t4 seems to spit more charge out the adc input than...

yes - i have aref tied to 3.3 and should have mentioned it and yes - that must be the default for reference because
i never have used the adc_reference........

glad you are on the air - don't...

jonr - thanks for the feedback

i got in a t4 code that is a spectrum analyzer, fed in a very clean 10 khz 3vp-p sinewave, and saw the same 2nd harmonic
size with and without those lines - so in...

tested teensyduino with arduino 1.8.13 this am - all ok w compile/run/serial monitor using codes
containing adc functions for tlc, t36, t4. install 153 on top of 153b3, win7pro64

do not know...

here are excerpts from that code - even tho i did not need bandwidth i left conversion, sampling, and averaging
as they had been for fast operation in a previous code because i am lazy - you will...

design the divider for low current draw on the battery - in an almost identical situation where i needed
to read batt v up to at least 14v (there was an ulta low iq regulator between batt and tlc) i...

more on 1.8.13
maybe the guys at Arduino are ok after all - if you go into preferences and turn off
"check for updates on start", get out of Arduino, shut down windows, reboot
windows then that...

maybe not a miracle - Murphy never sleeps

thanks for the feedback
that is right - arduino 1.8.13 - since there is only one adc library in the teensy stuff i wonder why it had to think so hard

very annoying item 1.8.13 - the engineering...

did closer inspection of compile reports re ADC under 1.53 beta 3 and found something that is not an error,
not a warning, but i don't remember it from past releases. as per previous post TLC T36 T4...

compiles using ADC library worked ok TLC, T35, T4. (of course using the new settings syntax i had to do for 1.52)
ala
adc->adc0->setAveraging(1);
etc
have not timed any ADC yet

under win7pro64: uninstall arduino 1.8.5 (and teensyduino 1.52), install arduino 1.8.13, install teensyduino 1.53 beta 3,
compiled and ran just fine several programs each for TLC, T36, T4. some TLC...

if your generator is 0 to 3.3 no load and 0 to 3.3 when hooked to teensy then current load is not a player.
have you looked at the gen both before and after connection to teensy? also - just be be...

i would not say easy - depends on what kind of soldering/de-soldering tools you have. good news it only has six leads,
bad news is it has a thermal pad center bottom that i bet is soldered down...

that is the 3.3 v regulator
how very hot but no current ? - it normally takes LOTS of current to get real hot

i have a thermal image to send you - how did you attach that photo?
never mind - i...

i saw some syntax changes between TD 1.48 and 1.52 that may relate to 1.53 betas?

needed in 1.48
adc->setAveraging(1,ADC_0);

needed in 1.52
adc->adc0->setAveraging(1);

also - total crash...

oddson - i agree

carlosemello - you used the word "piezo" - at a glance it might seem that you can just hook the output of a piezo
sensor (high C high Z) to a mux/atod but that is problematic for...

is a8 a default analog in?

i have only used a10 and a11 TLC and have used this declaration:
const int readPin = A10;
const int readPin2 = A11;

and then this setup:
pinMode(A10,...

jonr is right - but if you have a scope check for oscillation on the regulator output after you add the
cap - many low drop out regulators are sensitive to Cl and the esr of Cl ala they become...

i have never used a 3.2, have never used the a/d in the LC in a situation where i really cared about usable resolution,
but with the 3.6 i have gotten a dynamic range of 70db which is equiv to 11.6...

campbell - that is an interesting observation. in 1977 Motorola had a trademark term for their newest family
of processors - "systems on silicon" - wrong. but things like the ridiculously complex ...

it it is any help, when i was testing T4 snooze i started with example code Duff had put in the Snooze library
such as some thing like DeepSleep_all_wakeups - you might compare your code with that -...

cleaned up redundant code, no longer needs code changes in isr2 depending on slow/fast task time, and the
comments include editing one of the teensy core files so that the abort/recover time goes...

there is a 2.2 ufd on the T4 board on that pin - that is probably enough - leave room in your artwork for
and external 10-22 ufd but you probably won't need it.

when i sped it up to us=6250 and lg=625 the line in isr2() "++tc" had to be commented to prevent skipping
one task on a restart - who knows, at even faster task intervals it might have to become...

as a final summary point here is the code for 8 timeslices/4 tasks using noinit. i am sure that a real C programmer
could tighten it up and shrink it even further.

in task2 either comment or...

to add to that summary - the 4 task 8 timeslice (01020103) version using the noinit attribute method uses these TLC resources:
pgm space 12%, ram space 26%, both pit timers, and the abort-recover...

KurtE - have you run out of time for this? here instead of a code snippet is an entire pgm that boils it all down
comes up tries to recover from maybe_saved - prints result,waits 5 seconds, re...

KurtE - here is the top section of my pgm so you can see where i put your statements
and also the compiler error listing - earlier in this thread you can see an eeprom solution
that is the complete...

jonr - this version compiles no warnings and the contents of the variables it is used on do live thru the soft restart !!!
- best solution so far - thank you

KurtE - compiler not happy - after...

no dice - compiler comes back w "warning 'noinit' attribute directive ignored -
it compiles and of course variables are all zero after restart - but thank you

thanks - will try and let you know

it turns out there is some register storage in Teensy LC that will live thru a software restart
- 16 bits of the lptmr compare register. at one point defragster told me not to try to use it
unless...

please record the drop (both swing hi and swing low) - and work from the low current end so that if the internal
driver evaporates you will already have quite a bit of data. if you have time to kill...

looked in ... CEC - not sure what is going on or what errors may exist in table 22 but 1 ua is absurd and impossible.
try to calculate output swing/drop from the output resistance values in tables...

Mark,
you can't have too many unused pins !! gotta admit i went cross-eyed debugging my code for care and feeding of
serial in/serial out (haven't used a "circular memory" since the 70's). i hate...

look for vin low (max) and vin high (min) for the data input pin

at $0.57 singles and 0.49 10's the TLC + HC595 wins the cost battle - had a 595 in junk box - works fine - using as serial in serial out
remember that you need to re-write a shift register as you...