Category Archives: The quest for low power

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

Switching off SD cards for Low Power Data Logging

The tweaks I discuss in the  power optimization post bring sleep current on a typical build into the 0.1-0.12mA range; leaving the sleeping μSD cards  as the largest remaining power consumer on the Cave Pearl loggers.   And those cards have been a burr under my saddle for quite some time now, as they … Continue reading

Posted in DIY Arduino Datalogger, The quest for low power | 15 Comments

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

Posted in DIY Arduino Datalogger, The quest for low power | 2 Comments

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

Posted in Lessons learned., Test results & Data analysis, The quest for low power | 2 Comments

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

Posted in Developing a Drip Sensor, Expedition Reports & Updates, The quest for low power | Leave a comment

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

Posted in Test results & Data analysis, The quest for low power | 2 Comments