Briefly introduce the working principle and circuit diagram of multi-function temperature and humidity, liquid level automatic controller

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As shown in the figure, the auto controller consists of a step-down rectification power supply, a wet temperature sensor, a variable frequency oscillator, and a one-shot control circuit. The sensor can be equipped with a thermistor, a photoresistor, a mercury conductive thermometer and the like, connected across the charge and discharge loop of the 555 or the trigger end to change the frequency of the oscillator or the trigger state of the 555.