Category Archives: The quest for low power

The goal: 365 days on one set of AA batteries.

Another look at logger battery discharge curves…

I’ve written before about how the main battery discharge record is one of my primary tools to determine what happened when a logger fails, but I thought I would try another kick at that can; delving into some of the things that show up on units that are apparently … Continue reading

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A DIY Arduino data logger: Build Instructions – Part 4 (Power Optimization)

The first three tutorials in this series show how to build a promini based data logger that should sleep around 0.25mA, depending on the quiescent current of your sensors and your μSD card. That will usually get you to at least 6 months of operating … Continue reading

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Testing Power Use with Complex Datalogger Duty Cycles

There is an old saying that goes: “Yesterdays solutions are today’s problems” and I think that now describes this project. You see the first year of development was focused on pretty straightforward hardware issues, and solving each one produced significant gains in … Continue reading

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Field Report: 2015-03-17 Drip Logger Service Visit

In March my wife led a Northwestern University earth sciences trip to the Yucatan Peninsula. While she was busy with all the necessary preparations for the students who would be arriving shortly, I slipped away for a couple of hours to retrieve … Continue reading

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High (SD card) sleep current problem solved!

The more I thought about it, the more the high power drain of the flow sensors got under my skin. How had I misjudged the performance that badly, after so many successful bench top tests? I was determined to get to the … Continue reading

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Bench Testing vs. Real world power consumption of our Arduino dataloggers

I finally have a moment to look at the data from the recently retrieved flow meters, and the results are not what I was expecting. This was a five month deployment, with the units operating from March 22, 2014 to August 25, 2014. The three pendulum units … Continue reading

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Project Update: Power Tests & Battery issues

The power drain test of the spare TinyDuino based pendulum unit (identical to the ones we deployed back in March) has finally completed.  The unit captured sensor readings every minute from April 23rd to June 9th (about 62000 records), at which point I bumped it up … Continue reading

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