Arduino: read water quality with the TDS module
Measure total dissolved solids with the Gravity TDS module on an Arduino: clean wiring, temperature compensation, calibration, and what TDS cannot tell you.
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ESP32: measure water quality (TDS) with the analog TDS sensor
Wire the analog TDS sensor module to an ESP32, convert ADC counts to ppm with temperature compensation, and calibrate against a known solution instead of guessing.