| 摘要 |
PURPOSE: A switch using a sensor is provided to perform a small error and correct operation without using many transistors and resistors. CONSTITUTION: A sensor unit(201) senses a change of resistance. The sensed signal from the sensor unit(201) is inputted into a comparing unit(202),which compares it to a reference value. An on/off driving unit(203) performs on/off operation according to the result of the comparing unit(202). The sensor unit(201) senses the change of the resistance according to the change of a subject to sense such as the salinity of water and the surrounding temperature. When the resistance changes by the change of the salinity in the water or a difference with predetermined temperature from the sensor unit(201), the comparing unit(202) detects it, and when the control signal according to the resistance change is inputted to the on/off driving unit(203), the on/off driving unit performs the suitable on/off operation.
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