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Sara Damiano edited this page Feb 19, 2019 · 12 revisions


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This Arduino library gives environmental sensors a common interface of functions for use with Arduino-compatible dataloggers, such as the EnviroDIY Mayfly. The ModularSensors library is specifically designed to support wireless, solar-powered environmental data logging applications, that is, to:

  • Retrieve data from many physical sensors;
  • Save that data to a SD memory card;
  • Transmit that data wirelessly to a web server; and
  • Put the processor, sensors and all other peripherals to sleep between readings to conserve power.

The ModularSensors library coordinates these tasks by "wrapping" native sensor libraries into a common interface of functions and returns. These wrapper functions serve to harmonize and simplify the process of iterating through and logging data from a diverse set of sensors and variables. Using the common sensor and variable interface, the library attempts to optimize measurement timing as much as possible to reduce logger "on-time" and power consumption.

Although this library was written primarily for the EnviroDIY Mayfly data logger board, it is also designed to be compatible with a variety of other Arduino-based boards as well.

Data can currently be sent to these web services:

These sensors are currently supported:

Please note that the documentation in this wiki may have information that pertains to pending releases in the development branch of this repository.


Open an issue to suggest and discuss potential changes/additions. Feel free to open issues about any bugs you find or any sensors you would like to have added.

If you would like to directly help with the coding development of the library, there are some tips here on how to set up PlatformIO so you can fork the library and test programs while in the library repo. Please also take time to familiarize yourself with the classes and data structures this library uses. This library is built to fully take advantage of Objecting Oriented Programing (OOP) approaches and is larger and somewhat more complicated than many Arduino libraries. Make sure to familiarize yourself with the terminology and data structures the library uses.


Software sketches and code are released under the BSD 3-Clause License -- See file for details.

Documentation is licensed as Creative Commons Attribution-ShareAlike 4.0 (CC-BY-SA) copyright.

Hardware designs shared are released, unless otherwise indicated, under the CERN Open Hardware License 1.2 (CERN_OHL).


EnviroDIY™ is presented by the Stroud Water Research Center, with contributions from a community of enthusiasts sharing do-it-yourself ideas for environmental science and monitoring.

Sara Damiano is the primary developer of the EnviroDIY ModularSensors library, with input from many other contributors.

This project has benefited from the support from the following funders:

  • William Penn Foundation
  • US Environmental Protection Agency (EPA)
  • National Science Foundation, awards EAR-0724971, EAR-1331856, ACI-1339834
  • Stroud Water Research Center endowment
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