Gravity Analog pH Sensor Readings Drifting Despite Stable Power
Terry.King 2026-03-16 11:13:50 80 Views1 Replies Hi everyone,
I’m currently testing a DFRobot Gravity analog pH sensor powered with a stable 5V source, but I’m running into a strange issue. Even when the probe is sitting in a solution that should be stable, the readings slowly drift up and down by around ±0.4–0.6 pH over a few minutes.
So far I’ve checked the wiring, tried a different ADC module, and added some filtering capacitors to the power line, but the fluctuations are still there. The temperature of the solution also seems constant, so I’m not sure what’s causing the variation.
Has anyone experienced something similar with these sensors? I’d appreciate any troubleshooting tips or ideas on what else I could test.
Hi there! Sorry to hear you’re dealing with pH reading drift on your DFRobot Gravity analog pH sensor.
Could you first share the sensor’s specific SKU? We recommend checking the usage precautions and calibration methods in the official wiki corresponding to your SKU. You can also directly measure the voltage at the sensor’s signal output port to see if there is a significant offset in the voltage itself — this will help confirm whether the issue comes from the sensor or your setup.
If the drift persists and you need further analysis, please send detailed information (such as wiring photos, test data, or fluctuation records) to [email protected], and our team will help troubleshoot further.
niu.yixuan 