DFRobot Gravity Analog Turbidity Sensor for Arduino - Probe w/ Adapter

The sensor provides a 0-4.5V analog output. Connect the sensor's Gravity connector to your Arduino: Red wire (VCC) to 5V, Black wire (GND) to GND, and Blue wire (Signal) to an analog input pin (e.g., A0). Read the voltage using analogRead() and correlate it to turbidity levels via calibration.

Yes, but careful consideration is needed. The sensor itself requires a 5V supply. You can power it from a 5V source while connecting its 0-4.5V analog output directly to an ESP32's ADC pin, as the ESP32's ADC is 3.3V tolerant. Ensure your power source provides a clean 5V to the sensor's VCC pin.

Calibration requires known turbidity standard solutions. Immerse the probe in a clear standard (low NTU) and record the ADC value, then in a turbid standard (higher NTU). Use these two points to establish a linear correlation between your ADC readings and NTU values. The relationship is not linear across the entire range, so calibration near your target measurement point is recommended.

The detachable probe allows the sensitive optical components to be submerged directly into the liquid stream or tank, while the main electronics module can be mounted in a drier, more protected location. The adapter and cable facilitate this remote connection, improving the sensor's longevity and installation flexibility.