Comments for Blinkenlight

Comment on VU Meter by Vickie

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Comment on Supply Voltage Measurement by Jones sabo why don't you consider combine that sign

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Comment on Decoding Time Data by Markus Gritsch

Markus Gritsch — Wed, 03 Apr 2013 19:36:00 +0000

Great, looking forward to it. I really like reading your excellent articles. Keep up the good work!

Cheers,
Markus

Comment on Decoding Time Data by blinkenlightblog

blinkenlightblog — Wed, 03 Apr 2013 18:51:34 +0000

Hi Markus,

the current published version does not yet deal with timezone change. The current code line (under test) was running during the timezone change and performed flawless. However it is not yet fully documented. For the final version there will be several different cases:

1) The clock was synced at prior to the timezone changed and is still locked.
–> Simple, it can ignore the flags as the hour of the change is ruled by law –> as long at it can keep the phase lock the transition will happen smoothly.
1a) In case of a sync during the “double hour” that happens at CEST -> CET transition and at very high noise levels it may lock to the wrong hour. The chance is very tiny but it might happen. In this case it might take some time for it to recognize the issue. (Slightly longer than the time required for the initial lock).

2) In case it is syncing while the transition happens but can not acquire a lock before the transition is finished and the timezone data is noisy the impact is that sync time will double. If the data is clean and you happen to start syncing at the worst possible time it may take about 5-10 Minutes longer for the first sync.

I will publish the parts as I finish and test them. The next steps are:
a) add more decoder stages
b) add a local clock to deal with signal loss
c) some surprise how to keep a significantly better phase lock than the previous versions (once a first sync is acquired)

Cheers, Udo

Comment on Decoding Time Data by Markus Gritsch

Markus Gritsch — Wed, 03 Apr 2013 18:29:34 +0000

Hi Udo,

amazing code. I really like your matched filter approach
One question: How does the hour decoder respond to changes from and to daylight saving time?

Cheers,
Markus

Comment on Counting Resets by blinkenlightblog

blinkenlightblog — Wed, 03 Apr 2013 05:01:04 +0000

The “%” is not to force the result into the range 0..255. It is there to restrict the range to 0 .., count_limit-1.

Comment on Counting Resets by James Jones

James Jones — Wed, 03 Apr 2013 00:37:18 +0000

Looking up EEPROM.h, it would seem that read returns a uint_8, so the result it returns will be between 0 and 255 (inclusive), not between -128 and 127; you’d have to cast the result to a signed eight-bit type to get -`1, so I don’t think the additional % is necessary.

Comment on Heartbeat by Andreas

Andreas — Tue, 26 Mar 2013 20:50:13 +0000

Hi Udo,

thanks for your quick response. Yes, you were right. It was the missing copy of msTimer2 in the Arduino libary. I’m sure it is a common problem for beginners. Thanks for your help.

Andreas

Comment on Heartbeat by blinkenlightblog

blinkenlightblog — Tue, 26 Mar 2013 19:30:29 +0000

Hi Andreas, I edited your question a little bit to make the issue somehow more transparent. For whatever reason your copy of the sketch has corrupted include statements. Please use a copy of the original sketch as it is available on the blog. If you hover the mouse in the upper right corner you can copy it as text into the clipboard. If this copy fails to work you are most probably missing a copy of the msTimer2 library in your system. You can install it frome here http://playground.arduino.cc/Main/MsTimer2 or here http://www.pjrc.com/teensy/td_libs_MsTimer2.html. -Udo

Comment on Heartbeat by Andreas Storch

Andreas Storch — Tue, 26 Mar 2013 12:19:16 +0000

Heed help!! Hello, I’m an absolut beginner in Arduino programming and bought the blinkenlight shield for first steps. Trying out “knightrider” it worked without problems, but I can’t get “heartbeat” to run. I always get the message in function ‘void setup()’ “112 error ‘MsTimer2′ has not been declared” and “113 error: ‘MsTimer2′ has not been declared”. The sketch I’m using is

#include
#include
#include

What can I do?

Thank you and best regards.

Andreas Storch