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-   -   battery voltage vs current (http://www.chiefdelphi.com/forums/showthread.php?t=131051)

Aren Siekmeier 14-11-2014 10:04
Re: battery voltage vs current
 
Quote:
Originally Posted by DBMJ99 (Post 1408534)
This is fantastic data. It is really good to see what is going on during a real match. The spreadsheet does not indicate what the measurement interval is. I was wondering if you could confirm that. It seems like it is reading 50 times per second. There are 7100 readings, and assuming it is 2:30 in total duration that would be approximately 47 readings per second.
http://www.chiefdelphi.com/forums/sh...&postcount=153

This seems to suggest 330's code is also sampling at 40hz (25ms).

Al Skierkiewicz 17-11-2014 07:27
Re: battery voltage vs current
 
Everyone,
The limiting factor in the previous control system was the power supply on the DSC. It would cut out at about 5.5 volts which would cease PWM outputs. The power supply for the cRio would shut down at about 4.5 volts. So if the brownout didn't last a long time or was terribly deep, the cRio stayed up and the motor drive would stop allowing the battery to come back to normal levels.

Joe Ross 18-11-2014 14:14
Re: battery voltage vs current
 
Quote:
Originally Posted by DBMJ99 (Post 1408534)
This is fantastic data. It is really good to see what is going on during a real match. The spreadsheet does not indicate what the measurement interval is. I was wondering if you could confirm that. It seems like it is reading 50 times per second. There are 7100 readings, and assuming it is 2:30 in total duration that would be approximately 47 readings per second.
The data was read in the 50hz driver station loop in auto and telop (not disabled). However, as Aren mentioned, the data only updates at about 40hz. The last buffer of data wasn't written, which is why it comes out to a little shorter then 2:30.

Joe Ross 19-11-2014 22:56
Re: battery voltage vs current
 
1 Attachment(s)
The attached data is from additional matches (and probably some practice). The name of the file is meaningless. It doesn't meet all of Ether's criteria, as it doesn't have voltage before and after the match.

It would be interesting to perform Aren's analysis on all the matches and use that to compare the internal resistances of the batteries.


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