Detection circuit of urinal and detection method thereof

Abstract

The invention discloses a detection circuit of a urinal and a detection method thereof. The detection circuit comprises a capacitive electrode unit, a capacitive sensing module, a first vibrator, a frequency conversion module, a digital conversion module and a master control module. The capacitive electrode unit sends an induced capacitive signal to the capacitive sensing module, the capacitive sensing module detects a first vibrating frequency of the capacitive signal, the frequency conversion module outputs a difference frequency signal to the digital conversion module, the digital conversion module sends a digital signal to the master control module, and the master control module sends a control signal to an electromagnetic water valve of the urinal. The detection method can induce information of a human body accurately through the detection circuit and judges the water level detection of the urinal and the like. By mounting a plurality of capacitive electrodes on the urinal, the urinal can automatically induce changes of external environments and can accurately judge sensation of human body, water level detection of the urinal and the like, so that inductive failures caused by difference factors are avoided.

Description

technical field [0001] The invention relates to the technical field of intelligent control of urinals, in particular to a detection circuit of a urinal based on capacitive induction and a detection method of the circuit. Background technique [0002] In the prior art, in order to automate the work of the urinal body for going to the toilet, the traditional technology is to install human body detection sensors such as infrared sensors on the urinal. Most of the traditional infrared sensors adopt active infrared induction methods. That is, the infrared emitter emits infrared rays of a certain wavelength. By receiving the reflection, it is judged whether the object is within the effective range, and the function of water supply or water stop is realized. When the human body stands in the infrared area of ​​the urinal, the infrared rays emitted by the infrared emitting tube Because the human body is blocked and reflected to the infrared receiving tube, the signal processed by th...

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Problems solved by technology

[0003] However, the infrared signal emitted by the existing infrared technology is a pointing signal in a specific direction, so whether its function can be realized normally is closely related to factors with obvious individual differences such as the user's standing posture. Its surface reflection is unavoidable. For example, some substances with low reflectivity to infrared rays, such as black clothes, hair, etc., are difficult to realize automatic induction judgment. After the infrared light of the infrared emitter is reflected by these substances, only a few The infrared light is received by the infrared receiver

Due to the insufficient strength of the reflected signal, the sensor cannot judge whether there is a target, resulting in a sensor failure

[0004] However, infrared technology can only simply judge whether there is a user within a certain distance of the direction to be tested, so there is not enough information to accurately evaluate the real-time usage of the urinal, and it is difficult to realize more complex functions (such as water level detection, block recognition)

In addition, infrared signals cannot penetrate ceramics, so holes need to be set on the ceramic structure or arranged outside the ceramic structure to work normally, which increases the complexity and cost of design and manufacturing

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