My DFRobot sensor output fluctuates wildly under stable supply
fnf.unkin 2025-10-01 08:51:19 262 Views2 Replies Hello everyone . I am fnf— I’m working with a Gravity analog pH sensor (SKU gravity‑pH) and feeding it a clean 5V supply. But when I leave the setup idle, the pH readings swing ±0.5 unit over minutes, even though the solution and temperature are stable. I’ve double-checked wiring, replaced the ADC board, and added decoupling caps — still no luck.
Has anyone seen this random drift behavior? What steps or diagnostic tricks would you try next?
Put the electrode in a stable pH buffer (e.g., pH 7 then pH 4 or 10) and log continuously for 10–20 minutes. If a handheld pH meter drifts the same way, the probe/ junction/age is suspect.
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