Coqui conductivity sensor

## 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](]( 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: ### Notes - The github repo for a more permanent printed circuit board version of the coqui is [here]( 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]( - [Reacting to an LED with sound]( - [Assessing ambient light levels]( - [Assessing temperature with a thermistor]( - [Sending water quality voicemails with a coqui using]( [![water-vmail.png](]( ### Building your own Coqui - [Coqui BBv1.0]( a breadboarded version of the Coqui ### Building Coqui sensors - Making a conductivity probe from a [bottle cap and two 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](]( [![Screenshot_2018-02-28_at_9.59.46_AM.png](]( ...

Author Comment Last activity Moderation
xose "Añadir clavija al sensor Coqui para grabar las mediciones:" | Read more » almost 2 years ago
liz "Thank you! I added the tag lang:cz to indicate this was Mandarin language content " | Read more » over 3 years ago
amocorro "@amocorro awards a barnstar to imvec for their awesome contribution! " | Read more » over 3 years ago
natevw "Posting a comment so I can get a link to write a full report. " | Read more » over 4 years ago
Jjjjjj "Second test! " | Read more » almost 5 years ago
Jjjjjj "Testing! " | Read more » almost 5 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 » about 5 years ago
jack_ponting " " | Read more » about 5 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 » about 5 years ago
warren " @warren has marked @mimiss as a co-author. " | Read more » about 5 years ago
xose " This is fantastic. Thanks for the doc! " | Read more » about 5 years ago
shritejkhopade8 "a screenshot you could post? thaks for posting " | Read more » about 5 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 » about 5 years ago
warren " @warren has marked @asnow as a co-author. " | Read more » about 5 years ago
warren "Hi @sushills - i reposted your design to Upverter (with attribution and license ref), and took a few pics:" | Read more » over 5 years ago
warren "Oh WOW! Do you have any photos of the board, or a screenshot you could post? Thanks!! " | Read more » over 5 years ago
sushils "Hello, I know this a long time but, I just designed a PCB for this circuit that can be easily made at home and is exactly the size of a AA battery..." | Read more » over 5 years ago
xose "A bit late but here is how to plug the jack " | Read more » almost 6 years ago
xose "Deffinitely! On wednesday i'll post the mod ;) " | Read more » almost 6 years ago
warren "This is really cool. A recording would mean you could calibrate it later, too -- if you maybe dipped it in 2 different high and low solutions of kn..." | Read more » almost 6 years ago
warren "Oooooohhhhhhhh!!!!! " | Read more » almost 6 years ago
xose "Added a 3.5mm jack to record the wave ;D " | Read more » almost 6 years ago
warren "Hi! I made a bookletized version of the pdf for printing on half-letter-sized paper -- Booklet_Sensor_Journalism_Final.pdf " | Read more » about 6 years ago
warren "@kanarinka - we're planning to order a bunch of these to test out at MakeFaire SF at the end of may -- getting ready for a big order, and printing ..." | Read more » about 6 years ago