| 摘要 |
An electronic circuit for automatically controlling an electrically operated device on a motor vehicle, such as windshield wiper, fog lights, etc., for aiding driving during inclement weather includes a hygrometer having an electrical resistor with a resistivity which changes with respect to humidity located on a support base heated by an electric resistive heater on the support base and connectable to a substantially constant voltage power source. A threshold temperature detector located in the support base proximate the electrical resistor is electrically connected in series with the resistive heater for regulating the electrical energy to the resistive heater to maintain the support base and electrical resistor below a predetermined temperature such that the hygrometric sensor is not damaged.
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