OPEnS Lab - Environmental Sensing

Peer-reviewed journal articles

Undergraduate authors in bold.

2025

•  Prince, R., Roy, K., Jesudason, N., Belinga, M., Field, J., Heiesy, D., Arvidson, A., Menne, T., Selker, J., and Udell, C. 2025. PolyWAG: Autonomous filtered water sampling for eDNA. HardwareX, e00617. https://doi.org/10.5281/zenodo.14160133
• Al-Agele, H.A., Nguyen, B.D., Zimmermann, L.P., Singh, G., Walter, C., Udell, C. and Selker, J.S., 2025. Low-cost composite autosampler for wastewater sampling. HardwareX, p.e00631.

2024

• Vaughn, V., Ensinger, A., Harris, E., Shumway, E., Walton, V., Selker, J. and Udell, C., 2024, Under Review. Open-Source Insect Camera Trap with Vibrational Detection and Luring for Monitoring T. albidosparsus. HardwareX
• Richards, W.; Selker, J.; Udell, C., 2024. Loom: A Modular Open-Source Approach to Rapidly Produce Sensor, Actuator, Datalogger Systems. Sensors, 24, 3466. https://doi.org/10.3390/s24113466

2023

• Woo, W., Richards, W., Selker, J. and Udell, C., 2023. WeatherChimes: An open IoT weather station and data sonification system. HardwareX, p.e00402. https://doi.org/10.1016/j.ohx.2023.e00402

2022

• Al-agele, H.A., Jashami, H. and Higgins, C.W., 2022. Evaluation of novel ultrasonic sensor actuated nozzle in center pivot irrigation systems. Agricultural Water Management, 262, p.107436. https://doi.org/10.1016/j.agwat.2021.107436
• AL-agele, H.A., Mahapatra, D.M., Nackley, L. and Higgins, C., 2022. Economic Viability of Ultrasonic Sensor Actuated Nozzle Height Control in Center Pivot Irrigation Systems. Agronomy, 12(5), p.1077. https://doi.org/10.3390/agronomy12051077
• Duncan, L., Miller, B., Shaw, C., Graebner, R., Moretti, M.L., Walter, C., Selker, J. and Udell, C., 2022. Weed Warden: A Low-Cost Weed Detection Device Implemented with Spectral Triad Sensor for Agricultural Applications. HardwareX, e00303. https://doi.org/10.1016/j.ohx.2022.e00303

2021

• AL-agele, H.A., Jashami, H., Nackley, L. and Higgins, C., 2021. A Variable Rate Drip Irrigation Prototype for Precision Irrigation. Agronomy, 11(12), p.2493. https://doi.org/10.3390/agronomy11122493
• Chu, M., Patton, A., Roering, J., Siebert, C., Selker, J., Walter, C. and Udell, C., 2021. SitkaNet: A low-cost, distributed sensor network for landslide monitoring and study. HardwareX, 9, e00191. https://doi.org/10.1016/j.ohx.2021.e00191
• Clonch, C., Huynh, M., Goto, B., Levin, A., Selker, J., and Udell, C. 2021. High Precision Zero-friction Magnetic Dendrometer. HardwareX, e00248. https://doi.org/10.1016/j.ohx.2021.e00248
• Levintal, E., Kang, K.L., Larson, L., Winkelman, E., Nackley, L., Weisbrod, N., Selker, J.S. and Udell, C.J., 2021. eGreenhouse: Robotically positioned, low-cost, open-source CO2 analyzer and sensor device for greenhouse applications. HardwareX, 9, e00193. https://doi.org/10.1016/j.ohx.2021.e00193
• Nguyen, B., Goto, B., Selker, J.S., Udell, C. 2021. Hypnos board: A low-cost all-in-one solution for environment sensor power management, data storage, and task scheduling. HardwareX, 10: e00213. https://doi.org/10.1016/j.ohx.2021.e00213

2020

• Goertzen, L., Mehr, N., Lopez, M., Udell, C., and Selker, J.S. Low-Cost and Precise Inline Pressure Sensor Housing and DAQ for Use in Laboratory Experiments. HardwareX. e00112. https://doi.org/10.1016/j.ohx.2020.e00112
• Mehr, N., Roques, C., Méheust, Y., Rochetfort, S., & Selker, J. S. (2020) Mixing and finger morphologies in miscible non-Newtonian solution displacement. Exp Fluids 61, 96. https://doi.org/10.1007/s00348-020-2932-x

2019

• Alcala, J. M. L., Haagsma, M., Udell, C. J., & Selker, J. S. (2019). HyperRail: Modular, 3D Printed, 1-100 meter, Programmable, and Low-cost Linear Motion Control System for Imaging and Sensor Suites. HardwareX, e00081. https://doi.org/10.1016/j.ohx.2019.e00081

• DeBell, T. C., Goertzen, L., Larson, L., Selbie, W., Selker, J. S., & Udell, C. (2019). OPEnS Hub: Real-time Data Logging, Connecting Field Sensors to Google Sheets. Frontiers in Earth Science. https://doi.org/10.3389/feart.2019.00137

• Lapo, K., Freundorfer, A., Pfister, L., Schneider, J., Selker, J., & Thomas, C. (2019). Distributed observations of wind direction using microstructures attached to actively heated fiber-optic cables. Atmospheric Measurement Techniques. https://doi.org/10.5194/amt-2019-188

• Lopez Alcala, J. M., Udell, C. J., & Selker, J. (2019). A User-Printable Three-Rate Rain Gauge Calibration System. Frontiers in Earth Science. https://doi.org/10.3389/feart.2019.00338

Conference posters

2024

• Gasper, P., Udell, C., Selker, J. S. 2024. EC Sense: An Open-Source Electrical Conductivity Meter Based on the Wenner Method. H13N-1185. In AGU Fall Meeting 2024. AGU.
• Belinga, M., Prince, R., Kurniawan, H., Levi, T., Selker, J. S., and Udell, C. 2024. eDNA Sampler: A Field Programmable and Customizable Auto-sampler for eDNA. H13N-1194. In AGU Fall Meeting 2024. AGU.
• Le, N., Rasmussen, L., Elwood-Dieu, M., Zamora Re, M., Zheleva, D., Nackley, L., Selker, J. S., and Udell, C. 2024. High Precision Zero-friction Magnetic Dendrometer. H13N-1188. In AGU Fall Meeting 2024. AGU.
• Truong, B., Olsen, A., Hale-Brown, C., Walter, C., Selker, J. S., and Udell, C. 2024. LilyPad - Internet Connected Freshwater Reservoir Monitoring Device. H13N-1189. In AGU Fall Meeting 2024. AGU.
• Udell, C. and Selker, J. 2024. Openly Published Environmental Sensing (OPEnS) | Advancing Open Environmental Instrumentation. H13N-1184. In AGU Fall Meeting 2024. AGU.
• Alholi, M., Synytsia, M., Tanner, S., Vaughn, V., Ensinger, A., Selker, J., Udell, C. 2024. Pied Piper Trap. H13N-1192. In AGU Fall Meeting 2024. AGU.
• Truong, B., Milford, C., Udell, C., Selker, J. 2024. Smart Rock: Low-Cost Stream Monitoring. H13N-1193. In AGU Fall Meeting 2024. AGU.
• Thiruppathi Ahila, S., Jacklyn, C., Gasper, P., Richards, W., Selker, J., Udell, C. 2024. WeatherChimes: Weather monitoring and Sonification System. H13N-1191. In AGU Fall Meeting 2024. AGU.

2023

•  Ensinger, A., Vaughn, Vincent., and Udell, C., 2023, December. Pied Piper: An Open-Source Vibrational Camera Trap for Monitoring Activity Patterns and Population Distributions of Pest Insects. In AGU Fall Meeting 2023. AGU.
•  Burgos, A., Woo, W., Richards, W., Selker, J., and Udell, C., 2023, December. WeatherChimes: Weather monitoring and Sonification System. H41S-2017. In AGU Fall Meeting 2023. AGU.
• Porter, J., Moyce, C., Selvakumar, S., Williams, P., Le, N., Rasmussen, L., Amador, C., Noble, R., Sears, A., Levin, A., Selker, J., and Udell, C., 2023, December. High Precision Zero-friction Magnetic Dendrometer. H41S-2020. In AGU Fall Meeting 2023. AGU.
• Udell, C., Walter, C., and Selker, J., 2023, December. Openly Published Environmental Sensing (OPEnS) | Advancing Open Environmental Instrumentation. H41S-2021. In AGU Fall Meeting 2023. AGU.
• Milford, C., Hale-Brown, C., Truong, B., Selker, J., and Udell, C., 2023, December. Smart Rock: Low-Cost User-Friendly Stream Monitoring. H41S-2022. In AGU Fall Meeting 2023. AGU.
• Truong, B., Hale-Brown, C., Olsen, A., Walter, C., Selker, J., and Udell, C., 2023, December. LilyPad: An Internet Connected Freshwater Reservoir Monitoring Device. H41S-2023. In AGU Fall Meeting 2023. AGU.
• Prince, R., Roy, K., Belinga, M., Jesudason, N., Heisey, D., Iler, J., Kurniawan, H., Field, J., McFeeters-Krone, G.,  Selker, J., and Udell, C., 2023, December. The OPEnS POLYWAG Environmental DNA Sampling System. H41S-2024. In AGU Fall Meeting 2023. AGU.
• Vidmantas, A., Richards, W., Schenbeck, A., Goshay, I., Walter, C.,  Selker, J., and Udell, C., 2023, December. Slide Sentinel: Centimeter-level Precision Remote Landslide Detection System. H41S-2026. In AGU Fall Meeting 2023. AGU.

2022

• Singh, G., Udell, C., Walter, C., Selker, J. 2022. Evaporometer: An open source, load cell-based environmental sensing system for rainfall and evaporation. H52O-0659 In AGU Fall Meeting 2022. AGU.
• Woo, W., Richards, W., Udell, C., Selker, J. 2022. WeatherChimes. H52O-0660 In AGU Fall Meeting 2022. AGU.
• Richards, W., Woo, W., Udell, C., Selker, J. 2022. LoomV4, A rapid prototyping library for environmental sensing, telemetry, logging, and actuation. H52O-0661 In AGU Fall Meeting 2022. AGU.
• Udell, C., Walter, C., Selker, J. 2022. Openly Published Environmental Sensing (OPEnS) | Advancing Open Environmental Instrumentation. H52O-0662 In AGU Fall Meeting 2022. AGU.
• Vaughn, V., Shumway, E., Walton, V., Selker, J., Udell, C. 2022. Pied Piper: An Open-Source Vibrational Camera Trap for Autonomously Monitoring Activity Patterns and Population Distributions of Treehopper and Leafhopper Pest Insects. H52O-0663 In AGU Fall Meeting 2022. AGU.
• Roy, K., Wandhekar, N., Arvidson, A., Li, T., Jesudason, N., Pohlschneider, E., Levi, T., Moncada, E., Udell, C., Selker, J., Walter, C. 2022. Updates on PolyWAG: Autonomous filtered water sampling for eDNA. H52O-0664 In AGU Fall Meeting 2022. AGU.
• Milford, C., Udell, C., Selker, J. 2022. Smart Rock: Low Cost, User Friendly Stream Monitoring. H52O-0665 In AGU Fall Meeting 2022. AGU.
• Selker, J., Udell, C., Walter, C., AL-agele, H. 2022. Novel Sampling Devices for Sewage System Monitoring: The Beaver Dam and OPEnS Integrating Sampler. H52O-0666 In AGU Fall Meeting 2022. AGU.

2021

• Carpenter, D., Leshchinsky, B.A., Walter, C., Selker, J.S., Abed, M. and Udell, C., 2021, December. FloDar: An Inline Flow Meter for Observing Flow Data for Research. H45T-1424. In AGU Fall Meeting 2021. AGU.
• Christensen, R., Selker, J.S., Udell, C., Walter, C., Bohl, R., Miller, J., Good, S.P. and Wiman, N., 2021, December. An Affordable Open Source Tree Sap Flow Measurement System Using Flexible Printed Circuit Boards. H45T-1423. In AGU Fall Meeting 2021. AGU.
• Clonch, C., Goto, B., Huynh, M., Levin, A., Selker, J.S. and Udell, C., 2021, December. High Precision Zero-friction Magnetic Dendrometer. H45T-1425. In AGU Fall Meeting 2021. AGU.
• Goto, B., Nguyen, B., Selker, J.S.S., and Udell, C. 2021, December. Hypnos Board: A Low-cost All-in-One Solution for Environment Sensor Power Management, Data Storage, and Task Scheduling. H45T-1426. In AGU Fall Meeting 2021. AGU.
• Hale-Brown, C., Whitlow, C., Veach, A., Escoto, M., Walter, C., Udell, C. and Selker, J.S., 2021, December. Smart Rock-Low Cost Water Monitoring. H45T-1429. In AGU Fall Meeting 2021. AGU.
• Udell, C. and Selker, J.S., 2021, December. Openly Published Environmental Sensing (OPEnS)| Advancing Open Environmental Instrumentation. H45T-1428. In AGU Fall Meeting 2021. AGU.
• Wandhekar, N., Nguyen, B., Pechetratanapanit, K., Menne, T., Arvidson, A., Jesudason, N., Roy, K., Kryuchkov, D., Li, T., Levi, T. and Udell, C., 2021, December. PolyWAG (Water acquired Genomics) Opensource 24-filter eDNA Water Sampler-Robotic DNA Collection with High Performance Sample Isolation and Preservation. H45T-1432. In AGU Fall Meeting 2021. AGU.
• Whitlow, C., Devarajan, A., Clonch, C., Segura, C., Selker, J.S. and Udell, C., 2021, December. Measuring the Electrical Conductivity of Rainfall in Real Time. H45T-1427. In AGU Fall Meeting 2021. AGU.

2020

• Chu, M., Patton, A., Udell, C., Walter, C. and Selker, J.S., 2020, December. SitkaNet: A Low-Cost, Open-Source System for Landslide Monitoring and Study. In AGU Fall Meeting 2020. AGU.
• Clonch, C., Huynh, M., Goto, B., Selker, J.S., Udell, C. and Levin, A., 2020, December. Low-cost, Low-profile Dendrometer Optimized for Grapevines. In AGU Fall Meeting 2020. AGU.
• Gasper, P., Pelster, Z., Best, B., Walter, C., Udell, C. and Selker, J.S., 2020, December. Measuring Darcy Flux and Transient Pore Velocity: Development of a Compact Temperature, Pressure, and Electrical Conductivity Sensor. In AGU Fall Meeting 2020. AGU.
• Goto, B., Nguyen, B., Selker, J.S. and Udell, C., 2020, December. Hypnos Board: A Low-Cost All-In-One Solution for Environment Sensor Power Management, Data Storage, and Task Scheduling. In AGU Fall Meeting 2020. AGU.
• Kang, K., Kerr, A.C., Smith, M., Brady, C.G., Koontz, N., Selker, J.S. and Udell, C., 2020, December. Loom, A Simple Modular Framework for Rapid Prototyping Environmental Sensors, Actuators, and Data Collection. In AGU Fall Meeting 2020. AGU.
• Nguyen, B., Pechetratanapanit, K., Walter, C., Udell, C., Zimmermann, L.P. and Selker, J.S., 2020, December. COVID Sampler: Open-source Composite Auto-sampler Against the Pandemic. In AGU Fall Meeting 2020. AGU.
• Shumway, E., Nieri, R., Udell, C. and Selker, J.S., 2020, December. Autonomous Vibrational Analysis and Insect Behavioral Manipulation With Pied Piper. In AGU Fall Meeting 2020. AGU.
• Udell, C. and Selker, J.S., Openly Published Environmental Sensing (OPEnS)| Distributed Sensing, Distributed Society. In AGU Fall Meeting 2020. AGU.

2019

• Ebrahimi, K.K., Lunn, G.R., Hudson, B.M., Udell, C. and Selker, J.S., 2019. Slide Sentinel: A Fully Automated, Low-Cost Landslide Monitoring System Using Real Time Kinematics. AGUFM, 2019, H11H-1573.

• Nguyen, B., Pechetratanapanit, K., Udell, C., Walter, C., Selker, J.S. and Levi, T., 2019. PolyWAG Water Acquired Genomics System: A Field Programmable and Customizable Auto-sampler for eDNA. AGUFM, 2019, pp.H53S-2076.

• Stroh, A.R., Winkelman, E., Larson, L., Levintal, E., Nackley, L., Davidson, J., Selker, J.S. and Udell, C., 2019. 3D HyperSense: 1-100 meter, Low-Cost Programmable Gantry and Sensor Suites. AGUFM, H53S-2091.

2018

• Alcala, J.M.L., Udell, C. and Selker, J.S., 2018. HyperRail: Modular, 3D Printed, 1-100 meter, Programmable, and Low-cost Linear Motion System for Imaging and Sensor Suites. AGU Fall Meeting 2018.
• DeBell, T., Goertzen, L., Udell, C. and Selker, J., 2018. OPEnS Hub-A Real-Time Decentralized Internet Portal, Connecting Field Sensors to Google Sheets. Proc. AGU Fall Meeting.
• Larson, L., Levintal, E., Lopez Alcala, J.M., Selker, J.S., Nackley, L. and Udell, C., 2018. A Mobile Sensor Package for Real-time Greenhouse Monitoring Using Open-source Hardware. Proc. AGU Fall Meeting, H13P-1988.
• Lunn, G.R., Kwon, M., Walter, C., Udell, C. and Selker, J.S., 2018. Slide Sentinel: Designing Remote Sensor Systems to Estimate Landslide Potential in Oregon Landscapes. AGUFM, NH21B-0821.
• Nelson, M.F., Lopez Alcala, J.M., Woo, M., DeBell, T.C., Udell, C. and Selker, J.S., 2018. Evaporometer Upgrades| Enclosure and Sensor Redesign for Improved Weatherproofing and Accuracy in Real-Time Environmental Data Gathering. AGUFM, 2018, H13P-1982.
• Stoddard, B., Fookes, J., Lee, D., Richardson, W., Walter, C., Udell, C., Good, S. and Selker, J.S., 2018. A PCB Based Sap Flux Sensor for Increased Manufacturability and Lower Cost. Proc. AGU Fall Meeting.
• Udell, C., DeBell, T.C., Goertzen, L.D., Lee, D. and Selker, J.S., 2018. Loom: Plug and Play Wireless Sensor Actuator Platform for Rapid Prototyping New Instrumentation. Proc. AGU Fall Meeting, IN13B-05.

2017

• Alcala, J.M.L., Udell, C. and Selker, J.S., 2017. A High Precision $3.50 Open Source 3D Printed Rain Gauge Calibrator. 2017. AGU Fall Meeting. H41J-0824
• DeBell, T. C.; Udell, C.; Kwon, M.; Selker, J. S.; Lopez Alcala, J. M. "Design and Deployment of a General Purpose, Open Source LoRa to Wi-Fi Hub and Data Logger." Proc. AGU Fall Meeting. 2017: H41J-1576.
• Krejci, A., Lopez Alcala, J.M., Nelke, M., Wagner, J., Udell, C., Higgins, C.W. and Selker, J.S., 2017. Development of an Open Source, Air-Deployable Weather Station. AGUFM, 2017, H41J-1583.
• Kwon, M., Lopez Alcala, J.M., DeBell, T.C., Udell, C. and Selker, J.S., 2017. Evaporometer| A Wireless Mesh of Open-Source Rainfall/Evaporation Gauge and Sensor Suite for In Situ Near-Real-Time Environmental Data. AGUFM, 2017, H41J-1604.
• Nelke, M., Selker, J.S. and Udell, C., 2017. The OPEnSampler: A Low-Cost, Low-Weight, Customizable and Modular Open Source 24-Unit Automatic Water Sampler. AGUFM, 2017, H41J-1596.
• Stoddard, Brett, John Selker, and Chet Udell. "Examining the Effectiveness of Commercial RFID Tags as Soil Moisture Sensors." Proc. AGU Fall Meeting. 2017.
• Udell, C. and Selker, J.S., 2017. Openly Published Environmental Sensing (OPEnS)| Advancing Open-Source Research, Instrumentation, and Dissemination. AGUFM, 2017, IN44A-04.

2016

• Selker, J.S., Good, S.P., Higgins, C.W., Sayde, C., Buskirk, B., Lopez, M., Nelke, M. and Udell, C., 2016. Recent developments from the OPEnS Lab. AGUFM, 2016, H34F-08.

Theses

• Miller, Jackson T. 2021. Error Propagation in Sap Flow Measurements Using the Heat Ratio Method. Undergraduate Honors Thesis: Oregon State University. https://ir.library.oregonstate.edu/concern/honors_college_theses/5712md90s
• Guo, M.D., 2020. The Implementation of Passive RFID Tags to Sample Volumetric Water Content for an Autonomous Irrigation System. Undergraduate Honors Thesis: Oregon State University. https://ir.library.oregonstate.edu/concern/honors_college_theses/ht24wr60d
• Stoddard, Brett S. 2019. Hacking Rfid Tags to Produce Economical Soil Moisture Sensors. Undergraduate Honors Thesis: Oregon State University. https://ir.library.oregonstate.edu/concern/honors_college_theses/4m90f2174
• Inberg, T.J., 2018. Project Management and Design of a Modularized Internet of Things (IoT) Prototyping System. Undergraduate Honors Thesis: Oregon State University. https://ir.library.oregonstate.edu/concern/honors_college_theses/xs55mj293