Device and method for detecting water levels

Abstract

The invention discloses a device for detecting water levels. The device comprises a kettle (1). A first water level probe L1 and a second water level probe L2 are arranged in the kettle (1), the first water level probe L1 is connected with one end of a resistor R1, the second water level probe L2 is connected with one end of a resistor R2, the other end of the resistor R1 and the other end of the resistor R2 are connected with a common bus bar (2), the bus bar (2) is connected with a water level detection signal input end of a control module, and the signal input end is connected with a power source Vcc by a resistor R0. The device has the advantage that only a single input port and a single electrode of the control module need to be occupied, so that the multiple water levels can be detected by the device.

Description

technical field [0001] In general, the present invention relates to detection technology, in particular to a water level detection device and detection method. Background technique [0002] Smart tea making machines / smart electric kettles have been widely used. The applicant's prior patent application CN201610087588.8 discloses a tea making machine and a control method. The tea making machine is composed of a pot body and a pot seat. An electrode connector is installed in the pot seat. The electrode connector consists of a plurality of concentric metal rings. The standard electrode connector is a 5-pole connector (composed of 5 metal rings) or a 6-level connector (composed of 6 metal rings). In this application, an NTC thermistor is set in the pot, and the NTC The metal shell is connected to one pole of the electrode connector. After the kettle body is placed on the pot base, the NTC metal shell is connected to the main control module in the kettle body through the connecto...

AI Technical Summary

Problems solved by technology

However, in the above-mentioned water level detection circuit, the NTC thermistor can only be installed in a fixed position in the pot, and the water level can only be detected by using the NTC thermistor to detect whether the water level has reached this fixed position, and cannot detect whether the water level is high or low.

In order to detect the water level, in the prior art, multiple water level detectors are installed in the kettle to detect the water level, and each water level detector is connected to an electrode in the electrode connector. A water level detector needs to occupy a plurality of electrodes on the kettle base at the same time, which increases the manufacturing cost, and the number of electrodes on the kettle base is limited, so that too many water level detectors cannot be arranged in the kettle. For 5-pole connectors, only 3 water level detectors (high, medium and low) can be set at most, occupying three electrodes, and the other two electrodes are connected to the power line

Since each detector needs to occupy a detection input terminal on the control module, the control module is required to be provided with multiple detection input terminals, and the cost of the control module (such as a single-chip microcomputer) increases

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