Overview

The Riffle is a collection of designs that take an open source approach to water monitoring, with the intent of making gathering water information easier and more accessible. It is part of Public Lab's Open Water Project.

For an overview of the design philosophy behind the Riffle, see this wiki page.

The first Riffle design was an ARM-based datalogger board enclosed in PVC; Public Lab has supported development of an Atmel328-based datalogger enclosed in a water bottle.

Water Monitor Designs

By now, several instrument designs have been constructed around the Riffle, some of which of are described in an array of Github repositories:

• Openwaterproject -- the main organization on github
• riffle_328 -- hardware designs, instructions and software for getting started with the Riffle_328 datalogger
• riffle_328-conductivity -- Design considerations around conductivity
• riffle_328-depth -- Depth measurement circuit prototype
• riffle_328-turbidity -- Turbidity sensor prototype
• riffle_328-thermistor -- Connecting a thermistor to a Riffle
• riffle_328-i2c -- Connecting i2c sensors to a Riffle
• riffle_328-one-wire -- Connecting one-wire sensors to a Riffle

Sensor Designs

We've started to summarize some of the approaches to sensing water parameters like conductivity and turbidity:

• Sensing conductivity
• Sensing turbidity

Project Status

• 2016 Riffle_328 Status. A small order of Riffle_328 boards arrived late April 2016, and were sent to Public Lab community members as a way of testing the design and informing further development.

How to get a Riffle

The Riffle is open source, and anyone can take the designs above to a PCB fabricator and have one made. Since the Riffle is not yet available for sale from public lab, if you are interested in buying one, add your information to this interest form, and Public Lab will facilitate a group order: https://goo.gl/forms/ENPvDsfkUbuXC6YF3