Author Archives: edmallon

Calibrating Thermistors with a 3.3v Arduino

Selecting a thermistor (& series resistor) Most of the material you find about using thermistors makes the assumption that you are selecting parts based on maximizing sensitivity and interchangeability. But oversampling gives you access to enough extra ADC bits that … Continue reading

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Improving Arduino ADC resolution with Dithering & Oversampling

While I was figuring out how to read thermistors, I came across claims that you can improve the resolution of any Analog-to-Digital converter with a technique called oversampling & decimation. I had already doubled the number of ADC bits covering my target temperature range by powering a thermistor divider from the rails … Continue reading

Posted in Developing a Temp.Chain, Developing other sensors | 2 Comments

The 2016 Cave Pearl Project ‘Year in Review’

We made great strides in 2016 with development of new calibration procedures and continued refinement of the housings & connectors for multi-sensor builds. At this point I’ve cobbled together more than 130 loggers for the Cave Pearl Project. While I still have a way to go before I … Continue reading

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DIY Arduino ProMini Data Logger: 2016 Build Update

Its been almost a year since the last stand-alone logger tutorial, and I continue to receive questions from people adopting the platform in education settings.  That feedback makes it pretty clear that soldering is the biggest stumbling block for beginners, so I have reconfigured the build to use pre-made … Continue reading

Posted in DIY Arduino Datalogger | 10 Comments

Field Report 2016-07-09: I2C pressure sensors work on 20m cables!

With the term prep taking up everyone’s time, I almost forgot to post about the wonderful field season we had this summer.  We really covered the bases on this one: from surface loggers, to cave sensors, to new deployments out on the … Continue reading

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Using the Arduino UNO for Data Acquisition

I recently picked up a ADS1115 breakout board, and it was fairly easy to use that with the serial data plotting capability of the Arduino IDE. It’s not often that something works this well on the first try, and I thought I would post about using  the combination as a kind of … Continue reading

Posted in Developing other sensors, DIY Arduino Datalogger | Leave a comment

Build your own Arduino Starter Kits for the Classroom

It’s August, and we’re assembling kits for another run of the instrumentation course.  Over time we have come to rely on 328p based microcontroller boards (aka: Arduinos) so I though I would post a list of the parts & materials we use to help others fire up their own classroom. More than … Continue reading

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