A moisture sensor comprising a support substrate having a first face and a second face, geometrically opposite to the first face, and wherein: the first face is provided with a plurality of pairs of electrodes configured to be in contact with a liquid, the moisture sensor being characterized in that: the second face comprises a plurality of first means of detection connected to each other in parallel, and each first means of detection comprises a transistor associated with a pair of electrodes, and said transistor of each first means of detection is configured to switch from a first state to a second state when an electric current passes between electrodes (18A, 18B) of the pair of electrodes associated to the transistor, an electrode of the pair of electrodes being electrically connected in series to an input electrode (b) of the transistor and the other electrode of the pair of electrodes being electrically connected to a fixed potential, in particular, to an earth potential, and an output electrode (c) of the transistor being electrically connected in series with a first resistor, such that the moisture sensor is sensitive to the equivalent resistance (Req) of said first resistors of the plurality of the first means of detection. the first face is provided with a plurality of pairs of electrodes configured to be in contact with a liquid, the moisture sensor being characterized in that: the second face comprises a plurality of first means of detection connected to each other in parallel, and each first means of detection comprises a transistor associated with a pair of electrodes, and said transistor of each first means of detection is configured to switch from a first state to a second state when an electric current passes between electrodes (18A, 18B) of the pair of electrodes associated to the transistor, an electrode of the pair of electrodes being electrically connected in series to an input electrode (b) of the transistor and the other electrode of the pair of electrodes being electrically connected to a fixed potential, in particular, to an earth potential, and an output electrode (c) of the transistor being electrically connected in series with a first resistor, such that the moisture sensor is sensitive to the equivalent resistance (Req) of said first resistors of the plurality of the first means of detection. the second face comprises a plurality of first means of detection connected to each other in parallel, and each first means of detection comprises a transistor associated with a pair of electrodes, and said transistor of each first means of detection is configured to switch from a first state to a second state when an electric current passes between electrodes (18A, 18B) of the pair of electrodes associated to the transistor, an electrode of the pair of electrodes being electrically connected in series to an input electrode (b) of the transistor and the other electrode of the pair of electrodes being electrically connected to a fixed potential, in particular, to an earth potential, and an output electrode (c) of the transistor being electrically connected in series with a first resistor, such that the moisture sensor is sensitive to the equivalent resistance (Req) of said first resistors of the plurality of the first means of detection.