Coqui

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What Does It Do?

The Coqui: using audio as a sensor data format. 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). Look for recent updates on Public Lab here.

Activities

This is a list of community-generated guides for specific applications using your coqui. These activities can be categorized, and some may be more reproduced -- or reproducible -- than others. Try them out to build your skills, and help improve them by leaving comments. Together, we can repeat and refine the activities into experiments.

Activity grid

Purpose	Category	Status	Author	Time	Difficulty	Replications
Build a sound-generating Coqui conductivity sensor (new version!)	-	-	@warren	-	-	2 replications: Try it »
Building the new Coqui	-	-	@natevw	-	-	0 replications: Try it »
Coqui 文件	-	-	@imvec	-	-	0 replications: Try it »
Build a Coquí: A Simple Water Conductivity Sensor (version 1)	build	review-me	@akshaya	1h	easy	3 replications: Try it »
¿Cómo hago una serie de diluciones para calibrar un Coqui para medir sólidos disueltos totales (STD)?	-	-	@alejobonifacio	-	-	0 replications: Try it »
Construya un sensor de conductividad Coqui generador de sonido	-	-	@alejobonifacio	-	-	0 replications: Try it »
Analizar señal de audio del sensor Coqui con Audacity	-	-	@imvec	-	-	0 replications: Try it »
Build a "Mega Coqui" water conductivity sensor with an amplifier	-	-	@warren	-	-	0 replications: Try it »
Añadir clavija al sensor Coqui para grabar las mediciones	-	-	@imvec	-	-	0 replications: Try it »
Grabar muestras de audio del sensor Coqui	-	-	@imvec	-	-	0 replications: Try it »

Add an activity or request an activity guide you don't see listed

Activities should include a materials list, costs and a step-by-step guide to construction with photos. Learn what makes a good activity here.

Add your own activity Request an activity guide

Guides should include a materials list and a step-by-step construction guide with photo documentation. Learn what makes a good activity here.

Frequently Asked Questions

Ask a question about the Coqui

Title	Author	Updated	Likes	Comments
Can I measure CSF turbidity in real time?	@Cheesealmighty	about 2 years ago	0	3
Can DIY spectrometers be useful for pH determination and/or dissolved organic carbon of a water solution?	@alejobonifacio	about 2 years ago	2	19
¿como se que mi espectro de una solución sigue la ley de beer?	@edithcaballero19t	about 3 years ago	0	1
Webinar on using hyperspectral imaging in the recycling industry	@amirberAgain	over 3 years ago	0	2
Substitute diffraction grating for DVD?	@msuphysicsformcb	over 3 years ago	1	4
can i use a spectrometer to sense food wastes and use an arduino to make it light a led accordingly?	@tasneim3mon3em	over 3 years ago	0	1
Do you have any tips for splicing DVD-Rs for spectrometer builds?	@mimiss	almost 4 years ago	1	4
Measuring UV-C Sources	@jkenny23	almost 4 years ago	0	4
What light sources might I use to calibrate my spectrometer if I don’t have a CFL available?	@mimiss	almost 4 years ago	0	8
Problem whit workbench spectra. Unable to manipulate(work) whit any image	@damian_orovitz	about 4 years ago	0	1
How can I get the menu to calibrate SpectralWorkbench?	@experimentierwerkstatt_dm	about 4 years ago	1	9
what are the best light sensors?	@omarion	over 4 years ago	1	3
Aside from a wavelength calibration, has there been any discussion on doing some sort of intensity calibration to allow measurement of spectral irradiance?	@Light_Guy60	almost 5 years ago	0	1
I just gotten my newly purchased Infragram Pi Camera, my pi.local is blank and pi.local/Cam keeps popping up message "Error in RaspiMJPEG" hence I do not get any live video feed. Anyone can help?	@willieong	almost 5 years ago	1	1
How do I identify the base polymers in an unknown plastic for recycling?	@profpearce	almost 5 years ago	1	7
Can you help us with calibrating our spectrometer?	@KristinaTamara	almost 5 years ago	1	7
Split DVD – which part to use for spectrometer	@Nelari	almost 5 years ago	0	4
Can you give me measure for spectrum? Thank you.	@Skorex	almost 5 years ago	0	2
What causes spectrum distortion?	@nathanathan	over 5 years ago	0	1
How can I connect my gopro to SpectralWorkbench software? Is there other open software that would?	@CD3000	over 5 years ago	0	3
UV measurements	@exekutive	over 5 years ago	1	5
[SOLVED] Why is my image of the spectrum extremely "slim"? DVD+RW is not good as a diffraction grating!	@jaksch	almost 6 years ago	1	6
How can I get the absorption spectra once I have calibrated my spectrometer data?	@amenzel8	almost 6 years ago	1	1
Most accurate spectrographs?	@jneish	almost 6 years ago	0	1

Ask a question or help answer future questions on this topic

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:

For more information about the Coqui, post a question to the "water quality" mailing list here) (also listed in the left sidebar)
The github repo for a PCB 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.