CN202853050U - Detection device for preventing input/output (I/O) port humidifier from drying out - Google Patents

Abstract

The utility model discloses a detection device for preventing an input/output (I/O) port humidifier from drying out. One section of a leading-out end of a probe placed in a water tank is connected with a universal I/O port of a single chip microcomputer through a current-limiting resistor R2, and the other end of the probe is connected with a digital ground. Two ends of the probe are connected in parallel with a capacitor C and a resistor R1. The logically input threshold voltage of a high level and a low level of the I/O port is 1.6 volts. The detection device for preventing the I/O port humidifier from drying out is suitable for a single chip microcomputer control method, and is simple in structure, low in cost and high in reliability.

Description

The anti-checkout gear that dryouies of a kind of IO mouth humidifier

Technical field

The utility model belongs to the humidifying technology field, is particularly useful for the electronic product of air cleaning and humidifier one.

Background technology

Along with humidifier enters huge numbers of families, the electronic product of air cleaning and humidification one is more and more, and corresponding control module has adopted chip microcontroller control.Because the anti-dry that adopts in the past detects, circuit is complicated, and cost is higher, and corresponding fault rate is also higher.Therefore, necessary development is a kind of to be applicable to the Single-chip Controlling mode, and simple in structure, cost is low, the humidifier anti-dry checkout gear of high reliability.

The utility model content

The utility model is for the anti-shortcoming of dryouting testing circuit of existing Single-chip Controlling humidification water level, the anti-checkout gear that dryouies of a kind of humidifier simple in structure, low-cost, high reliability has been proposed, namely by single-chip I/O mouth, realize the anti-checkout gear that dryouies of humidification water level.

The utility model is achieved in that a kind of IO mouth humidifier is anti-and dryouies checkout gear, it is characterized in that, described IO mouth humidifier is anti-to be dryouied the checkout gear primary structure and be:

One section of the probe exit that is positioned in the tank is connected with the universal I/O port of single-chip microcomputer by current-limiting resistance R2, and another termination digitally; The two ends of a probe capacitor C in parallel and a resistance R 1.

Further, the threshold voltage of the high-low level logic of described IO input is 1.6V.

The humidifier anti-dry checkout gear that the utility model provides is applicable to the Single-chip Controlling mode, and simple in structure, cost is low, high reliability.

Description of drawings

Fig. 1 is the anti-electrical schematic diagram that dryouies checkout gear of IO mouth humidifier that the utility model provides.

The specific embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.

Fig. 1 shows the anti-structure of dryouting checkout gear of IO mouth humidifier that the utility model provides.For convenience of explanation, only show the part relevant with the utility model.

The utility model operation principle is by the probe that inserts in the tank water and anhydrous resistive characteristic change to be arranged in tank, to the variation of capacitor discharge time, realizes whether the water in the tank dryouied and detects.

Concrete such as accompanying drawing 1, one section of the probe exit that is positioned in the tank is connected with the universal I/O port of single-chip microcomputer by current-limiting resistance R2, and another termination digitally.

The two ends of a probe capacitor C in parallel and a resistance R 1, the threshold voltage of the high-low level logic input of IO is about 1.6V.At first the IO setup of attribute of the IO mouth of single-chip microcomputer is output, juxtaposition high level, and keeping a period of time guarantees the capacitor C charging, and the IO setup of attribute of IO mouth is input, and to the time counting of IO mouth from the high level to the low transition.When in the tank water being arranged, the probe two ends are resistive feature, and capacitor C is by R1 and probe discharge; When anhydrous in the tank, probe two ends open circuit, capacitor C according to difference discharge time of both of these case, realizes in the tank anhydrous judgement being arranged only by the R1 discharge.

The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.

Claims (2)

1. an IO mouth humidifier is prevented dryouting checkout gear, it is characterized in that, described IO mouth humidifier prevents that dryouting the checkout gear primary structure is:

One section of the probe exit that is positioned in the tank is connected with the universal I/O port of single-chip microcomputer by current-limiting resistance R2, and another termination digitally; The two ends of a probe capacitor C in parallel and a resistance R 1.

2. IO mouth humidifier as claimed in claim 1 is anti-dryouies checkout gear, it is characterized in that, the threshold voltage of the high-low level logic input of described IO is 1.6V.

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