# 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](https://publiclab.org/wiki/open-water). 

For an overview of the design philosophy behind the Riffle, see [this wiki page](https://publiclab.org/wiki/riffle_design_philosophy). 

The first **Riffle** design was an [ARM-based datalogger board enclosed in PVC](https://github.com/bgamari/riffle); [Public Lab](http://publiclab.org/wiki/riffle) has supported development of an [Atmel328-based datalogger enclosed in a water bottle](https://github.com/OpenWaterProject/riffle_328).  

# 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](https://github.com/OpenWaterProject) -- the main organization on github
- [riffle_328](https://github.com/OpenWaterProject/riffle_328) -- hardware designs, instructions and software for getting started with the Riffle_328 datalogger
- [riffle_328-conductivity](https://github.com/OpenWaterProject/riffle_328-conductivity) -- Design considerations around conductivity
- [riffle_328-depth](https://github.com/OpenWaterProject/riffle_328-depth) -- Depth measurement circuit prototype
- [riffle_328-turbidity](https://github.com/OpenWaterProject/riffle_328-turbidity) -- Turbidity sensor prototype
- [riffle_328-thermistor](https://github.com/OpenWaterProject/riffle_328-thermistor) -- Connecting a thermistor to a Riffle
- [riffle_328-i2c](https://github.com/OpenWaterProject/riffle_328-i2c) -- Connecting i2c sensors to a Riffle
- [riffle_328-one-wire](https://github.com/OpenWaterProject/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](https://publiclab.org/wiki/conductivity_sensing)
- [Sensing turbidity](https://publiclab.org/wiki/turbidity_sensing)

# 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.