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.
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.
|Build a Coquí: A Simple Water Conductivity Sensor||build||review-me||@akshaya||1h||easy||0 replications|
|Coqui PCB + audio jack||build||proposal||@donblair||-||-||0 replications|
|Making a DIY conductivity probe from a water bottle and metal screws||build||draft||@donblair||1h||easy||0 replications|
|Coqui BBv1.0: Using a thermistor as a temperature probe||verify||draft||@donblair||1h||easy||0 replications|
|Coqui BBv1.0: Reacting to an LED with Sound||verify||draft||@donblair||1h||easy||0 replications|
|Coqui BBv1.0: Assessing Ambient Light with a Photoresistor||observe||draft||@donblair||1h||easy||0 replications|
|Coqui BBv1.0: Testing conductivity of a solution||observe||draft||@donblair||1h||easy||0 replications|
|Coqui BBv1.0||-||-||@donblair||-||-||0 replications|
|Coqui draft board design on Upverter||-||-||@warren||-||-||0 replications|
|How much are Coqui measurements affected by hot/cold water?||-||-||@warren||-||-||0 replications|
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
|How much are Coqui measurements affected by hot/cold water?||@warren||about 2 years ago||4|
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
- ambient light
Build a Coqui
Instructions on the breadboard-based "BBv1.0" edition of the Coqui can be found here:
- 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.
Demo Coqui applications
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