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Coqui conductivity sensor
coqui

## What Does It Do? **The Coqui: a simple device to read a sensor via an audible tone.** We're exploring using audio frequencies to convey sensor readings -- like a modem, but even simpler -- in order to make sensor readings more accessible for people (or to enable data transmission over ubiquitous audio jacks on PCs and smartphones). ## Latest version The [latest and simplest version of the Coqui](/notes/warren/03-01-2019/build-a-sound-generating-coqui-conductivity-sensor) can be seen in the following images. This version differs from [the previous](/notes/ashkaya/09-17-2016/build-a-coqui-a-simple-water-conductivity-sensor) in a few ways: * smaller, cheaper circuitboard (breadboard) * fewer wires * flatter wires which make it easier to see the circuit However, the circuit is fundamentally the same! Click these images to enlarge: [![IMG_20190123_111639_270.jpg](/i/28988?size=medium)](/i/28988?size=original) [![IMG_20190118_205609_421.jpg](/i/32338?s=m)](/i/32338?s=o) ## Assemble the Coqui Here are a few guides to building different versions of the Coqui: [notes:grid:activity:coqui] ## Coqui versions The Coqui has been refined, remixed, and modified plenty over the years. [activities:coqui-version] ## Modify the Coqui [activities:coqui-mods] ## Do something with the Coqui Once you've built a Coqui, here are a few things you can do with it: [notes:grid:activity:coqui-usage] Add an activity or request an activity guide you don't see listed **** ## Frequently Asked Questions [questions:coqui] **** [![coquibb.JPG](https://i.publiclab.org/system/images/photos/000/007/410/medium/coquibb.JPG)](https://i.publiclab.org/system/images/photos/000/007/410/original/coquibb.JPG) A Coqui is a simple, inexpensive, open source device that generates an audible tone that is based on any electric resistance-based measurement. For example, a Coqui can measure: * conductivity of liquids * temperature * ambient light ## Build a Coqui Instructions on the breadboard-based "BBv1.0" edition of the Coqui can be found here: http://publiclab.org/notes/donblair/09-30-2014/coqui-bbv1-0 ### Notes - The github repo for a more permanent printed circuit board version of the coqui is [here](https://github.com/OpenWaterProject/coqui) The Coquí is a circuit that allows you to 'hear' the readings from various sensors. Once the Coquí is assembled, you'll be able to 'hear' the conductivity of a solution, the temperature of a room, or the color of a pH test strip. The design was named (onomatopeically) after the several species of small frogs which have a loud, distinctive call at night. ### Demo Coqui applications - [Testing the conductivity of a solution](http://publiclab.org/notes/donblair/09-30-2014/coqui-bbv1-0-testing-conductivity-of-a-solution): - [Reacting to an LED with sound](http://publiclab.org/notes/donblair/09-30-2014/coqui-bbv1-0-reacting-to-an-led-with-sound): - [Assessing ambient light levels](http://publiclab.org/notes/donblair/09-30-2014/coqui-bbv1-0-assessing-ambient-light-with-a-photoresistor): - [Assessing temperature with a thermistor](http://publiclab.org/notes/donblair/09-30-2014/coqui-bbv1-0-using-a-thermistor-as-a-temperature-probe): - [Sending water quality voicemails with a coqui using vojo.com](http://publiclab.org/notes/donblair/09-10-2014/water-quality-coqui-voicemails): [![water-vmail.png](https://i.publiclab.org/system/images/photos/000/007/409/medium/water-vmail.png)](http://publiclab.org/notes/donblair/09-10-2014/water-quality-coqui-voicemails) ### Building your own Coqui - [Coqui BBv1.0](http://publiclab.org/notes/donblair/09-30-2014/coqui-bbv1-0): a breadboarded version of the Coqui ### Building Coqui sensors - Making a conductivity probe from a [bottle cap and two metal screws](http://publiclab.org/notes/donblair/09-30-2014/making-a-diy-conductivity-probe-from-a-water-bottle-and-metal-screws) ## Parts list See the initial parts list here: #13459 and #11209 for a DigiKey shopping cart link at $19 per kit. And @kanarinka mentions: > there are a couple other things that are helpful to have that are not shown (like the probe made from the top of a water bottle with two screws in it and alligator clips to attach that to the breadboard) Scans of an invoice from DigiKey: [![Screenshot_2018-02-28_at_9.59.17_AM.png](https://publiclab.org/system/images/photos/000/023/760/large/Screenshot_2018-02-28_at_9.59.17_AM.png)](https://publiclab.org/system/images/photos/000/023/760/original/Screenshot_2018-02-28_at_9.59.17_AM.png) [![Screenshot_2018-02-28_at_9.59.46_AM.png](https://publiclab.org/system/images/photos/000/023/761/large/Screenshot_2018-02-28_at_9.59.46_AM.png)](https://publiclab.org/system/images/photos/000/023/761/original/Screenshot_2018-02-28_at_9.59.46_AM.png) ...


Author Comment Last activity Moderation
natevw "Posting a comment so I can get a link to write a full report. " | Read more » about 3 years ago
Jjjjjj "Second test! " | Read more » over 3 years ago
Jjjjjj "Testing! " | Read more » over 3 years ago
CarolineWebb " Really easy to understand to assembling the Coquí - a Simple Water Conductivity Sensor which is used in academic sector. And will sure share with ..." | Read more » over 3 years ago
jack_ponting "https://www.google.co.uk/ " | Read more » over 3 years ago
imvec " Once you build a mega-coqui you can then record the audio signal and later analyze it using the free and open source software Audacity Record → h..." | Read more » over 3 years ago
warren " Found a way to use an online equalizer! https://publiclab.org/questions/warren/03-01-2019/can-we-use-a-guitar-tuning-app-to-get-numeric-data-from-..." | Read more » over 3 years ago
warren " I made a https://p5js.org sketch of an equalizer -- you can also hover your mouse to see the frequency: https://editor.p5js.org/jywarren/sketches..." | Read more » over 3 years ago
warren " Noting as a reference, this interesting video on making maps of conductivity data! @mimiss " | Read more » over 3 years ago
warren " From a great suggestion from @mimiss I dug up an EQ or equalizer visualization from p5js.org: https://p5js.org/examples/sound-frequency-spectrum...." | Read more » over 3 years ago
warren " @warren has marked @mimiss as a co-author. " | Read more » over 3 years ago
warren "Noting here, a couple ways to approach analyzing Coqui audio data: https://publiclab.org/notes/imvec/06-11-2018/analizing-the-signal-of-the-coqui-..." | Read more » over 3 years ago
MadTinker " @warren You know it's pretty sad when I don't catch things like this myself :smiley: I was referring to the raw data. " | Read more » over 3 years ago
warren "Hi, MadTinker, thanks for the info here. I was just wondering if you  meant that the Coqui itself was noisy, or if you're referring to noise in the..." | Read more » over 3 years ago
MadTinker "I've successfully used the DFRobot TDS/conductivity sensor combined with the a Mini-Pearl system. The Coqui was much too noisy. My Arduino setup wa..." | Read more » over 3 years ago
xose " This is fantastic. Thanks for the doc! " | Read more » almost 4 years ago
shritejkhopade8 "a screenshot you could post? thaks for posting " | Read more » almost 4 years ago
warren " Hi all! With help from @zengirl2, @asnow and @bronwen, we've posted a new Coqui activity with a smaller breadboard and flatter wiring here: https:..." | Read more » almost 4 years ago
warren " Hi all! With help from @zengirl2, @asnow and @bronwen, we've posted a new Coqui activity with a smaller breadboard and flatter wiring here: https:..." | Read more » almost 4 years ago
warren "Hi all! With help from @zengirl2, @asnow and @bronwen, we've posted a new Coqui activity with a smaller breadboard and flatter wiring here: https:/..." | Read more » almost 4 years ago
warren " @warren has marked @asnow as a co-author. " | Read more » almost 4 years ago
warren " I also found recently that a more powerful battery makes it louder, which i guess i could've figured out from the comments above (lol) but, just t..." | Read more » almost 4 years ago
warren " I had seen a post on Instagram a while back of people measuring the pulses from a Coqui using an Arduino... but i was thinking more about this and..." | Read more » almost 4 years ago
warren "Hi @sushills - i reposted your design to Upverter (with attribution and license ref), and took a few pics: https://upverter.com/jywarren/523e0539..." | Read more » almost 4 years ago