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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
warren "So just finally circling back here; I'm happy to post step-by-step photos and to put notes on all existing Coqui docs if we are pretty much OK with..." | Read more » about 4 years ago
warren " I think it's possible, yeah! I'm not sure how fast PWM is or how easily you can set the rate? " | Read more » about 4 years ago
warren " " | Read more » about 4 years ago
warren "I tried doing a layout as @akshaya has done on a bigger board (https://publiclab.org/notes/ashkaya/09-17-2016/build-a-coqui-a-simple-water-conducti..." | Read more » about 4 years ago
zengirl2 "@warren I'm with @Liz that it looks cute. Also, on a Fritzing diagram I think this will be clear enough. It is actually easier to find the hole for..." | Read more » about 4 years ago
roberts_ecofarm "I think that crossing the wires over the top makes it harder to see which pins are connected. It does save space, but as a teaching aid I think it..." | Read more » about 4 years ago
warren "Nope, just thought it might be confusing in a diagram, but it saves space.  On Tue, Nov 27, 2018, 4:51 PM \<notifications@publiclab.org wrote: ..." | Read more » about 4 years ago
liz "I personally think it's cute to have the wires do a criss-cross over the 555-timer, and it kind of keeps them out of the way....does it mess up the..." | Read more » about 4 years ago
warren "Like this... Sorry, now running out of light! " | Read more » about 4 years ago
warren "I could also have those wires go over the chip, would that be confusing? " | Read more » about 4 years ago
warren "Amazing! I've been trying to further simplify the wires-as-diagram version to make adding a resistor easier and also just have fewer weird routing..." | Read more » about 4 years ago
xose "SPANISH INSTRUCTIONS -1) Antes de empezar familiarizate con los elementos. Recuerda realizar un paso de cada vez y ayudar a otros grupos antes de ..." | Read more » about 4 years ago
xose "@xose awards a barnstar to pdhixenbaugh for their awesome contribution! " | Read more » about 4 years ago
xose "Translating instructions to spanish in 3, 2, 1... " | Read more » about 4 years ago
adiizo-la "If you like this configuration we can always update the Fritzing diagram. [Gclub มือถือ] https://gclub-mobile.snbbet.com/ [ทางเข้า Gclub] https:/..." | Read more » about 4 years ago
pdhixenbaugh "@liz it would be super cool to have a module where the participants could build it this way, and then add components or otherwise change the circui..." | Read more » about 4 years ago
pdhixenbaugh "I have never seen wires like that, and they look awesome! I would love to give my kids the choice of which style of wires to use! Also, these are ..." | Read more » about 4 years ago
warren "I was also able to confirm that adding a resistor in-line with one of the probe wires lowered the frequency! Much lower and less annoying! " | Read more » about 4 years ago
warren "I think an activity on /coqui would work. I was also able to confirm that adding a resistor in-line with one of the probe wires lowered the freque..." | Read more » about 4 years ago
zengirl2 "@warren I like these short wires because they tend to stay in place better when inserted, and they also aren't like sloppy spaghetti. :) If you lik..." | Read more » about 4 years ago
warren "OK, also just a note, i had trouble w the placement of the orange wire, which in Leslie's diagram goes to a spot one pin higher than in my version...." | Read more » about 4 years ago
warren "Oh WOW! Do you have any photos of the board, or a screenshot you could post? Thanks!! " | Read more » about 4 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 » about 4 years ago
roberts_ecofarm "@warren - that looks great. Waiting on some 555 timers so I can try this out too. " | Read more » about 4 years ago