Abstract: According to one embodiment, a sensor device includes a transmitter part, a receiver part, a signal generation part, and a determination part. The transmitter part is configured to emit a radio wave outside as a transmission wave. The receiver part is configured to receive a reflection wave reflected by an object as a reception wave. The signal generation part is configured to generate a first output signal generated based on the transmission wave and the reception wave, a second output signal provided with a phase different from that of the first output signal, and a third output signal generated based on the first output signal and the second output signal. The determination part is configured to determine presence or absence of an object based on the first output signal, the second output signal, and the third output signal.

Abstract: A sanitary device includes a wet area device includes a radio wave sensor, a control section and a controlled section. The radio wave sensor is configured to output a sensing signal concerning a water flow. The control section is configured to determine a state of the water flow based on phase information of the sensing signal and to output a control signal based on a determination result. The controlled section is configured to be controlled based on the control signal.

Abstract: According to one embodiment, a toilet seat device includes a toilet seat, and a Doppler sensor using radio waves. An opened state of the toilet seat is sensed when approach of a user to the toilet seat is sensed based on a sensing signal outputted by the Doppler sensor. It is regarded that use is in progress for urination by the user when the toilet seat is in the opened state. In a state of being regarded that use is in progress for urination, a post-use operation is performed after sensing leaving of the user from the toilet seat based on the sensing signal.

Abstract: A toilet device includes a toilet seat device, a radio wave sensor, and a controller. The toilet seat device is provided on a toilet bowl. The controller is configured to operate the toilet seat device based on a signal outputted from the radio wave sensor. The radio wave sensor is being operable for detecting presence of a human body in a first area including front of the toilet seat device, detecting motion of a human body in a second area including the front of the toilet seat device and a region outside the first area, and determining sensing of the human body based on detection result of the motion of the human body and detection result of the presence of the human body.