Category Archives: Developing a Temp.Chain

My efforts to create an underwater temperature sensor string using one-wire DS18B20s

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

Better Thermistor Readings with an Arduino: Series Resistors & Aref

Up to this point I’ve been using IC thermometers (TMP102, DS18b20, etc) because they are easy get going, and seemed to offer better resolution than I could get out of the Arduino’s humble 10bit ADC.  But several of the projects I’ve been working … Continue reading

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

Field Report 2016-03-27: Progress on the DS18B20 Temp. Strings

Happy to report the successful deployment of three more temperature strings:   and I think it’s fair to say the first two protoypes have almost run their course: Logger/Sensors Time/Max.Depth Comment #45  (19 x 25cm) [1st build] 201503-08 (14m) Full data from Temp chain, Qsil … Continue reading

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DS18B20 Calibration: Finally nailed it!

The high residuals I was seeing up at 40°C, and the dubious waterproofing on those cheap DS18b20‘s convinced me that I needed a dry well for the calibrations. Since lead has a thermal conductivity 100x better than water, my first though … Continue reading

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Triaging Cheap DS18B20 Temperature Sensors

As I dive into another batch of cheap DS18B20’s for a new set of temperature strings, I thought I should post a note about the pre-filtering I do with these guys before investing effort to properly calibrate and epoxy them. After attaching … Continue reading

Posted in Developing a Temp.Chain | 4 Comments

Field Report 2015-12-15: New DS18B20 Sensor Chains Installed

The August deployment produced both success and failure from our 1st-generation temperature strings. We still managed to get both of those older units back on their feet with fresh batteries, and we add two beta units to the set.  I really had to scramble to get … Continue reading

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Field Report 2015-08-12: Success with DS18B20 Temperature Strings!

We were already happy with the flow & drip sensor data from this trip because, despite the TMP102 problems, most of the units had performed brilliantly.  But for me, the real prize of the season was going to come from the underwater temperature strings … Continue reading

Posted in Developing a Temp.Chain, Expedition Reports & Updates | 6 Comments