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flashing AVRs at high speed
I went snurfling around in my collection of AVR spec sheets and found some that state "20 years at 85C" and "100 years at 25C" data retention times.  'course, there's a...
Monday, 7 September 2020 - 10:37
[Architecture] - Work In Interrupts -v- Main Loop and sync issues.
Re-reading some of the early posts in this thread, I think the OP may have confused the Program Counter (PC) with the stack.  While the stack can contain Program Counter...
Monday, 7 September 2020 - 08:02
[Architecture] - Work In Interrupts -v- Main Loop and sync issues.
Incidentally, the one good use I found for this sort of thing was fatal error handling.   e.g. Given an AVR controlled machine with a big red Emergency Stop button (for...
Monday, 7 September 2020 - 06:08
[Architecture] - Work In Interrupts -v- Main Loop and sync issues.
To expand a bit on what obdevel (#10) was up to, another thought is break up all the 'do work' code into 'small pieces', then prohibit interrupts from occurring while the 'small...
Monday, 7 September 2020 - 03:50
[Architecture] - Work In Interrupts -v- Main Loop and sync issues.
Monkeying with the stack and its pointer is trivial in assembler, but I very rarely do so, because as pointed out, that way lies (a) madness.   S.
Monday, 7 September 2020 - 00:23
Has anyone ever damaged a reset pin by omitting the diode?
Never used a diode or a capacitor on the RESET line myself.  Only odd resets I've seen have been in situations when other bizarre things were going on in the power supplies....
Wednesday, 2 September 2020 - 23:00
Suggest a good scope?
I'm in the 'four-channel' camp myself.  Lurv my TDS2014 (4Ch, 100MHz).  It was outside the OP's budget when new, but could probably be found used for about that now....
Wednesday, 2 September 2020 - 22:56
water level conductive test
Refraction.   But I hafta admit the idea of a liquid-cored inductor is fascinating on many levels.    S.
Wednesday, 2 September 2020 - 07:40
water level conductive test
(Incidentally, one thing you can do for fun is pour yourself a glass of your finest local tap-water, then put your multimeter probes into it and measure the resistance...  )...
Wednesday, 2 September 2020 - 06:17
water level conductive test
To be a lot more helpful, yes.  If you're using typical tap water all you need is two copper strips about 1cm apart, at least one of which ends at the desired level. ...
Wednesday, 2 September 2020 - 06:13
water level conductive test
Hmm.  Other ways to measure water level...      These have the same problems as barnacle's solution, but here's a few thoughts:   Turn on a known power...
Wednesday, 2 September 2020 - 05:59
Acess 32KHz clock on DS1302?
david.prentice wrote: 2.  add a software correction e.g. add/subtract one second at midnight on certain days to correct the monthly accuracy.   Strongly recommend you...
Monday, 31 August 2020 - 02:06