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2026

How to Normalize Readings from Multiple Temperature Sensors (with a DIY heated water bath)original ↗

12 May 2026

2024

Sync RTC time to a GPS & Setting the DS3231 Aging Offset Register to Reduce Clock Drift original ↗

23 Oct 2024

How to measure PAR (Photosynthetically Active Radiation) using a BH1750 Lux Sensor original ↗

10 Aug 2024

How to Normalize a Group of Pressure Sensors so they can be Deployed as a Set original ↗

1 May 2024

How to calibrate NTC thermistors (A DIY method you can do at home)original ↗

20 Apr 2024

2023

The e360: A DIY Classroom Data Logger for Science [2023]original ↗

1 Dec 2023

Testing Cr2032 Coin Cell Batteries with μA to mA pulsed duty cycles original ↗

5 Jun 2023

A DIY Pressure Chamber to Test Underwater Housings original ↗

25 May 2023

“Too Ugly to Steal & Too Heavy to Carry” : Insights from a decade of rain gauge deployment original ↗

15 Apr 2023

Waterproofing your Electronics Project original ↗

17 Mar 2023

2022

2-Part ProMini Logger that runs >1 year on a Coin Cell [2022]original ↗

9 Mar 2022

2021

Timing an LED light-sensor with Pin Change Interrupts original ↗

10 May 2021

Enhance your Logger with an OLED & TTP223 Capacitive Touch Switch original ↗

1 Mar 2021

2020

Adding two OLED displays to your Arduino logger (without a library)original ↗

15 Nov 2020

Hacking a Capacitive Soil Moisture Sensor (v1.2) for Frequency Output original ↗

27 Oct 2020

Pro Mini Classroom Datalogger [2020 No-Solder Update]original ↗

22 Oct 2020

Using the ADS1115 16-bit differential ADC for Rapid Burst-Sampling original ↗

21 May 2020

Building an ATmega 1284p based Data Logger original ↗

12 May 2020

DIY Data Logger Housing from PVC parts (2020 update)original ↗

8 Apr 2020

2019

Single Diode Temperature Sensor with Arduino ICU (& reverse-bias leakage)original ↗

4 Nov 2019

Creating a Normalized Vegetation Index Sensor with two LEDs original ↗

30 Aug 2019

How to make Resistive Sensor Readings with DIGITAL I/O pins original ↗

25 Mar 2019

‘No-Parts’ Temperature Measurement with Arduino Pro Mini original ↗

25 Feb 2019

Easy 1-hour Pro Mini Classroom Datalogger [Feb 2019]original ↗

21 Feb 2019

Pro Mini Logger Project for the Classroom [ EDU Jan: 2019 ]original ↗

12 Jan 2019

2018

Tutorial: Adding an SPI SSD1306 OLED to an Arduino Logger (without a library)original ↗

17 Oct 2018

Starting Points & Ideas for your Arduino STEM Curriculum original ↗

7 Oct 2018

Using Arduino’s Internal EEprom to Store Data & Screen Fonts original ↗

24 Aug 2018

Using the Nokia 5110 LCD with an Arduino Data Logger original ↗

18 May 2018

Measuring Temperature by Comparing the Arduino System Clock to an RTC original ↗

3 Feb 2018

The 2017 Cave Pearl Project ‘Year in Review’original ↗

3 Jan 2018

2017

Tutorial: Adding Sensors ( & Modules ) to Your Arduino Data Logger original ↗

17 Dec 2017

Bil A. Phillips: an Explorer, a Teacher, and a Friend original ↗

28 Nov 2017

Tutorial: How to Control I²C Sensors with Arduino Code original ↗

3 Nov 2017

Measuring EC ( electrical conductivity ) with Arduino original ↗

13 Aug 2017

Arduino Pro Mini Data Logger : Add Screw-Terminal Board (2017 Update)original ↗

20 Jun 2017

Cutting Power to Secure Digital Media cards for Low Current Data Logging original ↗

21 May 2017

Tutorial: Calibrating Oversampled Thermistors on an Arduino Pro Mini original ↗

26 Apr 2017

Give your Arduino a high resolution ADC by Oversampling with noise (from a toggled pin)original ↗

27 Feb 2017

The 2016 Cave Pearl Project ‘Year in Review’original ↗

8 Jan 2017

2016

Arduino Pro Mini Data Logger : with Dupont Jumpers (2016 Update)original ↗

27 Oct 2016

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

22 Sept 2016

Tutorial: Using the Arduino UNO Serial Plotter for Live Data Acquisition original ↗

15 Aug 2016

Build your own Arduino Starter Kit for the Classroom original ↗

8 Aug 2016

Tutorial: Better Thermistor Measurement on Arduino via Series Resistors & Aref original ↗

10 Jun 2016

Field Report 2016-03-28: Oldest Generation of Loggers Retired original ↗

12 May 2016

Field Report 2016-03-27: Progress on the 1-Wire DS18B20 Temperature Strings original ↗

1 May 2016

Field Report 2016-03-25: Collecting Data in Coastal Mangroves original ↗

19 Apr 2016

Field Report 2016-03-17: MCP9808 Temperature Sensor Fails Under Pressure original ↗

6 Apr 2016

Field Report 2016-03-16: Rain Gauges Over Reporting original ↗

5 Apr 2016

DS18B20 1-Wire calibration with Arduino: Finally nailed it!original ↗

5 Mar 2016

Improving the Accuracy of 1-Wire DS18b20 Temperature Sensor Groups original ↗

12 Feb 2016

Measuring battery discharge on an Arduino Data Logger original ↗

20 Jan 2016

Field Report 2015-12-20: Winding Down…original ↗

13 Jan 2016

Field Report 2015-12-15: New DS18B20 1-Wire Sensor Chains Installed original ↗

11 Jan 2016

Field Report 2015-12-14: Re-install the Drip Monitoring Network original ↗

10 Jan 2016

Field Report 2015-12-11: Flow sensors go Farther & Deeper original ↗

9 Jan 2016

Field Report 2015-12-10: Sensor Precision vs Accuracy vs Drift original ↗

7 Jan 2016

Field Report 2015-12-08: The DIY Logging Rain Gauges Work!original ↗

5 Jan 2016

2015

Arduino UNO Datalogger Project for Beginners (ie: no soldering)original ↗

23 Dec 2015

Cave Pearl Data Loggers at GSA 2015 original ↗

8 Nov 2015

Arduino Pro Mini Data Logger : Part 4 : Power Optimization (2015)original ↗

5 Nov 2015

Arduino Pro Mini Data Logger : Part 3: Sensors & Housing (2015)original ↗

24 Oct 2015

Arduino Pro Mini Data Logger : Part 2 : Logger Platform Assembly (2015)original ↗

24 Oct 2015

Arduino Pro Mini Data Logger : Part 1: Component Preparation (2015)original ↗

24 Oct 2015

Interview: Cave Pearl Project Team: 2015-09-20 original ↗

20 Sept 2015

Modeling the Effect of Drag Enhancement on Water Flow Measurements original ↗

3 Sept 2015

Field Report 2015-08-17: Flow Sensors go back into Akumal Bay original ↗

2 Sept 2015

Field Report 2015-08-14: Install New Sensors at RioSecreto original ↗

1 Sept 2015

Field Report 2015-08-12: Success with DS18B20 1-Wire Temperature Chains!original ↗

26 Aug 2015

Field Report 2015-08-10: Diagnosing a TMP102 Temperature Sensor Failure original ↗

26 Aug 2015

Field Report 2015-08-07: Retrieve Flow Sensor from Akumal Bay original ↗

24 Aug 2015

Field Report 2015-08-06: Retrieve Drip Sensors from RioSecreto original ↗

21 Aug 2015

Measuring Humidity with Arduino: A Masons Hyrgometer Experiment original ↗

8 Jul 2015

Measuring Power Use with Complex Data Logger Duty Cycles original ↗

29 Jun 2015

Developing an Arduino weather station…original ↗

15 Jun 2015

Tutorial: How to calibrate a compass (and accelerometer) with Arduino original ↗

23 May 2015

Field Report: 2015-03-23 Flow Sensor “drag fins” tested original ↗

20 Apr 2015

Field Report: 2015-03-18 One logger sacrificed to the sea gods.original ↗

15 Apr 2015

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

11 Apr 2015

Calibrating DS18B20 1-Wire Sensors with Ice & Steam point measurement original ↗

30 Mar 2015

Using multiple 1-Wire DS18B20’s for a DIY Temperature Sensor Chain original ↗

1 Mar 2015

A DIY Underwater Housing for Arduino Data Loggers made from PVC pipe original ↗

4 Feb 2015

A Simple DIY Underwater Connector System made from plumbing parts original ↗

29 Jan 2015

The 2014 Cave Pearl Project ‘Year in Review’original ↗

28 Jan 2015

Field Report 2014-12-20: Our 2nd Drip Sensor Deployment at Rio Secreto original ↗

18 Jan 2015

Field Report 2014-12-18: A Water Flow Sensor Co-deployment.original ↗

16 Jan 2015

Field Report 2014-12-16: Rebuilding & Reloading the Old Sensors.original ↗

9 Jan 2015

Field Report: 2014-12-12 Retrieve the Costal Discharge Flow Sensors original ↗

7 Jan 2015

Field Report: 2014-12-11 Our First Real-World Drip Sensor Data!original ↗

6 Jan 2015

Field Report 2014-12-10: Collecting Salt Water Pearls original ↗

5 Jan 2015

Project Update: Gearing up for field work 2014-11-26 original ↗

5 Jan 2015

2014

Sleeping an MCP9808 on an Arduino based Pressure, Humidity & Temperature logger original ↗

16 Dec 2014

Project Update: the Next Generation of Drip Sensors original ↗

1 Dec 2014

Cave Pearls at the 2014 Geological Society of America Conference original ↗

31 Oct 2014

The DIY Arduino datalogger with low power shut down capability (2014)original ↗

7 Oct 2014

What to expect buying cheap electronic components from eBay & AliExpress original ↗

6 Oct 2014

High SD card sleep-currents from counterfeit cards & floating pins original ↗

22 Sept 2014

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

21 Sept 2014

Field Report 2014-09-02: Our first open water deployment original ↗

19 Sept 2014