Patent ID: 11933754
Assignee: LG ELECTRONICS INC.
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 28:
29. A method for operating a sensor, the method comprising:
generating direct current power with a radio signal by receiving the radio signal from an external device;
determining whether the radio signal is a signal requesting measurement of the ion concentration representing water quality of a sensing target material or a signal requesting measurement of salinity of the sensing target material, by being woken up by the direct current power;
supplying a first driving current to a first electrode and a second electrode to sense a first measurement voltage corresponding to an impedance change of the first electrode and the second electrode to which the sensing target material is brought into contact with when the radio signal is determined to be the signal requesting the measurement of ion concentration;
determining whether the first measurement voltage satisfies a set ion reference voltage;
transmitting a first digital signal corresponding to the ion concentration calculated by applying the first measurement voltage to a set first logarithmic function to the external device when the first measurement voltage satisfies the ion reference voltage;
supplying a second driving current lower than the first driving current to the first electrode and the second electrode, when the first measurement voltage does not satisfy the ion reference voltage;
determining whether a second measurement voltage sensed at the first electrode and the second electrode by the second driving current satisfies the ion reference voltage; and
transmitting a second digital signal corresponding to the ion concentration calculated by applying the second measurement voltage to a set second logarithmic function to the external device, when the second measurement voltage satisfies the ion reference voltage.