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Coquí by @PublicLab is a Simple Sensor for Detecting Conductivity of Water – it’s a 555, Speaker, & Homemade Probe

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The Coquí is a simple water conductivity sensor designed by @donblair that is designed for use in an educational context. The coquí is a simple circuit assembled on a breadboard that has a speaker that outputs high frequency sound when the water conductivity is higher and lower frequency sounds when the conductivity is lower.

Read more here and here.


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