Search found 26 matches

by LarryTru
Sun Oct 12, 2014 6:31 am
Forum: MicroPython pyboard
Topic: Real-Time Clock (RTC) drift
Replies: 27
Views: 32138

Re: Real-Time Clock (RTC) drift

Thanks for that tip. I should remember that everything important about the project is on github. With that crystal, it seems to me the clock should be more accurate than I have observed. I need to do some measurements, but I'm wondering if there is some other cause for the drift. Previously, I assum...
by LarryTru
Sun Oct 12, 2014 4:39 am
Forum: MicroPython pyboard
Topic: Real-Time Clock (RTC) drift
Replies: 27
Views: 32138

Re: Real-Time Clock (RTC) drift

Is there a parts list for the pybpard? I couldn't find one. I want to check out the specs for Y2, the RTC crystal.

Larry
by LarryTru
Sat Oct 11, 2014 6:45 am
Forum: MicroPython pyboard
Topic: Real-Time Clock (RTC) drift
Replies: 27
Views: 32138

Re: Real-Time Clock (RTC) drift

Interesting methodology to use the internal calibration values.

I also found that the previously popular chips and breakouts are no longer available.

I did't find the Micro Analog Systems one.

You're way ahead of me. :)

Larry
by LarryTru
Fri Oct 10, 2014 9:38 am
Forum: MicroPython pyboard
Topic: Real-Time Clock (RTC) drift
Replies: 27
Views: 32138

Re: Real-Time Clock (RTC) drift

Hello, Yes, I was reading about variability in AC line frequency today. Previously, I thought it was rock solid. As you said, turns out not so much. Still, even with variations, my guess is it would result in much improved accuracy. Still not that great for me since I'm planning battery powered proj...
by LarryTru
Thu Oct 09, 2014 10:05 am
Forum: MicroPython pyboard
Topic: Real-Time Clock (RTC) drift
Replies: 27
Views: 32138

Re: Real-Time Clock (RTC) drift

Sorry, I did mix the ideas a bit. Agreed, using a 50/60 hz reference signal is preferable since it ensures the clock runs accurately all the time. In case a method to generate a reference signal is not found, I was also weighing the alternative for correcting drift by periodically resetting the time...
by LarryTru
Wed Oct 08, 2014 11:58 pm
Forum: MicroPython pyboard
Topic: Real-Time Clock (RTC) drift
Replies: 27
Views: 32138

Re: Real-Time Clock (RTC) drift

Very Interesting, That was exactly the sort of information I was looking for when I started the thread. Personally, I'm not concerned with the initial setting of the clock, I want it to be more accurate and not drift so much (I know that's not very precise, but I haven't decided how much drift is ac...
by LarryTru
Sun Oct 05, 2014 10:44 pm
Forum: MicroPython pyboard
Topic: Real-Time Clock (RTC) drift
Replies: 27
Views: 32138

Real-Time Clock (RTC) drift

Hello, I didn't see anything posted anywhere about others noticing significant drift in the RTC. I have noticed that mine drifts quite a bit. Has anyone else already noticed this and looked into it? I saw that the data sheet says that the RTC can be calibrated. But I haven't tried to learn about tha...
by LarryTru
Sat Sep 27, 2014 9:23 pm
Forum: General Discussion and Questions
Topic: Getting "disk not ejected properly" in OSX
Replies: 33
Views: 32047

Re: Getting "disk not ejected properly" in OSX

Do we know if the code change had the intended effect and prevented the call to StopUnit? There's no logging of that is there?
by LarryTru
Sun Sep 14, 2014 7:00 pm
Forum: General Discussion and Questions
Topic: Question about Timer.callback(), lambdas and functions
Replies: 7
Views: 9581

Re: Question about Timer.callback(), lambdas and functions

Thanks especially for that last tip about exceptions from interrupt handlers. Lot's of time lost debugging with too little info. ;)

Larry
by LarryTru
Sun Sep 14, 2014 9:21 am
Forum: General Discussion and Questions
Topic: Getting "disk not ejected properly" in OSX
Replies: 33
Views: 32047

Re: Getting "disk not ejected properly" in OSX

Hello, From what I've read, flash drives (which I assume the Micro Python emulates) shouldn't be impacted by or react to a "disk standby". Pure speculation, but maybe the Micro Python board is treating a "standby" condition like it is an "eject". Alternately, if there is a "active" condition after a...