Two-wire parallel type electronic water gauge circuit

Abstract

The invention discloses a two-line parallel type electronic water gauge circuit. The circuit is composed of multiple stages of water level detection sub-circuits which are arranged in parallel at equal intervals, a voltage division circuit, a microprocessor and the like. The water level detection sub-circuit is composed of an NMOS tube, a resistor, a detection electrode and a common electrode. Whether a water body makes contact with a detection electrode or not is used for deciding connection and disconnection of an NMOS tube, then whether a low-impedance path is provided for detection signaltransmission or not is determined, multi-stage parallel convergence transmission is conducted, finally, a microprocessor MCU conducts analog-digital conversion through AD to obtain a voltage value, the voltage value is compared with reference voltage, and water level information is obtained. A two-wire system replaces a previous four-wire system, analog signals replace digital signals, the flexible electronic water gauge has the advantages of being large in measuring range, capable of being cut at will, ultralow in power consumption, wide in working voltage and temperature range, light in weight, small in size, high in response speed, high in interference resistance, high in corrosion resistance and the like, the waterproof level can reach IP68, and the flexible electronic water gauge is further machined.

Description

technical field [0001] The invention relates to the technical field of water level measurement, in particular to a two-wire parallel electronic water gauge circuit. Background technique [0002] The electronic water gauge (electrode-type water level sensor) is a water level measurement sensor that uses the conductivity of water to collect water depth information through signal detection electrodes arranged in parallel at equal intervals. The signal detection electrodes of the acquisition circuit can judge whether the electrodes are high or low according to the potential. contact with bodies of water. The water depth is judged according to the number of electrodes submerged in the water. Most of the electronic water gauges on the market are composed of circuit boards, common poles, detection electrodes, epoxy resin, and metal casings. The common poles are connected to the metal casing, and the detection electrodes are connected to the PCB circuit board. Good contact with wa...

AI Technical Summary

Problems solved by technology

[0007] Since the above solution uses a digital logic chip: it requires more complex sequential circuits and multiple interface pins of the microprocessor (MCU), too many cascaded stages of detection electrodes will reduce the water level acquisition speed, reduce the anti-interference performance, and it is difficult to adapt to data update In the case of high frequency, it is necessary to develop a new type of electronic water gauge to solve the problems existing in the existing technology

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