Estimate conductivity-derived TDS trends with temperature compensation and calibration; TDS alone cannot determine whether water is safe to drink.
Use the cable-mounted JSN-SR04T transducer for splash-prone distance measurements while keeping its controller board dry and accounting for the blind zone.
Read relative ethanol-vapor changes from an MQ-3 only after warm-up and calibration; the module is not a legal breath tester or certified safety instrument.
Control the ISD1820 record and playback inputs from Arduino while respecting the selected board's trigger behavior and recording duration.