Gravity: Analog TDS Sensor/ Meter for Arduino (0–1000ppm)

This Gravity analog TDS sensor turns an Arduino project into a DIY meter for tracking total dissolved solids in water. With a 0–1000ppm measurement range, this TDS sensor supports water sample comparisons, domestic water monitoring, and hydroponic experiments. The kit brings together a signal transmitter board, waterproof probe, and analog sensor cable, with Arduino wiring instructions and example code available in the Product Wiki. From a simple serial-monitor readout to a custom water monitoring project, this TDS sensor provides an accessible way to add TDS measurements to a microcontroller-based design.

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Easy Arduino Setup, from Wiring to Calibrated Readings

This analog TDS sensor connects through the included 3Pin cable without soldering, simplifying assembly for DIY projects. A 3.3–5.5V supply range and 0–2.3V analog output support both 3.3V and 5V controllers with suitable analog inputs. Arduino examples cover basic measurements and calibration with a known reference solution, providing a clear starting point for displaying TDS values in ppm before adding project-specific displays, logging, or control functions.

AC Excitation for Stable Water Monitoring

This TDS sensor uses AC excitation to help prevent probe polarization, supporting a more stable output signal and extending probe service life. This design is useful for projects that take repeated water measurements, such as tracking TDS changes over time or comparing samples during an experiment. The Arduino measurement example also applies median filtering to sampled readings, helping reduce fluctuations in the displayed value.

Waterproof Probe for In-Water Measurements

This TDS sensor includes a two-electrode probe with a waterproof head and cable, allowing the sensing end to remain immersed during water measurements. The separate probe and signal board make placement straightforward: the probe sits in the water while the electronics remain outside the container. The 83cm total probe length provides flexibility when arranging a tabletop test, educational demonstration, or DIY water monitoring setup.