| 摘要 |
<p>A turbidity sensor unit provided in a dishwasher includes a light emitting element and a light receiving element placed facing each other and sandwiching the pipe of the washing water circulation path; a light emission control circuit that current-controls the amount of light emission from the light emitting element according to PWM output from the control unit; a light receiving circuit that extracts a voltage value to be input to the control unit from a current flowing through the light receiving element. The control unit has multiple voltage levels that are reference values to be compared with a voltage value extracted from the light receiving circuit.</p> |
