A self-calibration water level measurement using an interdigital capacitive sensor.

Highlights: [•] We propose an interdigital capacitive sensor for water level measurement. [•] This sensor has low-cost, low-energy, good repeatability, and high linearity. [•] This sensor can directly be applied to various types of water without recalibration. [•] This sensor can measure water level with 0.2cm resolution. [•] This sensor is also sensitive enough to trace the variability of water level. [ABSTRACT FROM AUTHOR]