Abstract
Turbidity is a physical property related to the scattering of light by particles that aresuspended in a liquid. Commercial turbidimeters are priced at the range of hundreds tothousands of dollars. Considering this scenario, it is proposed in this work the developmentof a low-cost portable turbidimeter for monitoring of turbidity in processes. An infrared LEDwas used as light emitter, and an infrared phototransistor as light receiver. The signalprocessing control unit was developed with the Arduino Uno platform. The calibration of theturbidimeter was done by means of a comparative test in triplicate, using as reference thecommercial turbidimeter 2100P, HACH®. The turbidimeter was able to perform analysis inthe range of 100 to 1000 NTU, presenting an innovation character given its portability andcomputer communication via USB, and in a good price range for the prototype, costing US$46.30
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