CN204215530U - Baby wets the bed testing circuit - Google Patents

Abstract

The utility model discloses a baby bed-wetting detection circuit, which comprises a humidity-sensitive resistor R1 used to obtain the baby's bed-wetting signal. The output voltage of the output end supplies power to the bluetooth signal transmitting module of the subsequent stage, and the bluetooth signal transmitting module sends a baby bedwetting signal to the bluetooth alarm device wirelessly connected to it, and then the bluetooth alarm device gives a baby bedwetting alarm. Its remarkable effect is: the detection circuit controls the power supply of the alarm circuit according to the detected baby bedwetting signal, which is energy-saving and environmentally friendly, the circuit structure is simple, and the implementation cost is low; the alarm signal is transmitted wirelessly through Bluetooth, so that the alarm device can be realized Carry it with you, it is not easy to miss the alarm signal, and it is more convenient to use.

Description

Baby bedwetting detection circuit

technical field

The utility model relates to the technical field of baby bedwetting detection and alarm, in particular to a baby bedwetting detection circuit.

Background technique

Babies aged 1-3 are unable to control the time of urination because their brain and bladder are immature. These physiological factors lead to bed-wetting of babies from time to time. Especially young babies are more likely to wet the bed at night. Babies are prone to wetness and cold after bedwetting, which will affect their health and development, and even cause mental retardation in severe cases.

At present, it is common practice for the parents or nanny of the baby to check the baby at regular intervals and to urinate the baby in time to prevent bedwetting from happening. But this method is neither scientific nor convenient, and it cannot be found in time when the baby wets the bed, and measures can be taken to deal with it. However, the baby bedwetting alarm device in the prior art has the following disadvantages: one is that each module in the alarm device is always in a charged state, which consumes the battery circuit faster and does not save energy; the other is that the circuit is complicated and the cost is higher; the third is that the alarm cannot Carry it with you, it is easy to miss the alarm signal, and the effect of use is greatly reduced.

Utility model content

Aiming at the deficiencies of the prior art, the purpose of this utility model is to provide a baby bedwetting detection circuit, which can supply power to the alarm circuit only when the baby bedwetting alarm signal is detected, the circuit is simple, energy-saving and environment-friendly.

In order to achieve the above purpose, the utility model describes a baby bed-wetting detection circuit, the key of which is that it includes a humidity sensitive resistor R1 for obtaining the baby bed-wetting signal, one end of the humidity sensitive resistor R1 is connected to the positive pole of the DC power supply, and the other end is R3 is connected to the base of the triode T2, the collector of the triode T2 is connected to the positive pole of the DC power supply through the resistor R2, the emitter of the triode T2 is grounded, the collector of the triode T2 is also connected to the base of the triode T1, and the collector of the triode T1 is connected to the base of the triode T1 through The resistor RP1 is connected to the positive pole of the DC power supply, the emitter of the triode T1 is grounded, the collector of the triode T1 is also connected to the positive pole of the Zener diode D1, and the negative pole of the Zener diode D1 is connected to the enable control terminal of the power chip U1. The control terminal is also grounded through the resistor R4, the input terminal of the power chip U1 is connected to the positive pole of the DC power supply, and the output terminal of the power chip U1 supplies power to the alarm circuit.

In the absence of bedwetting, the resistance value of the humidity sensitive resistor R1 is very large, so that the triode T2 is in the cut-off state. At this time, the collector of the triode T2 is at a high level, and the triode T1 is in the conduction state, that is, the power chip U1 is enabled. The terminal is in a low level state, and the power chip U1 has no output. When the baby’s bed-wetting is detected, the resistance value of the humidity sensitive resistor R1 decreases and the triode T2 is turned on, causing T1 to be in the cut-off state, the anode of the Zener diode D1 is in a high level state, and the enable control terminal of the U1 power chip is high level, the output voltage of the power supply chip U1 provides power for the alarm circuit. The detection circuit controls the power supply of the alarm circuit according to the detected baby bed-wetting signal, so as to avoid the alarm circuit being in a charged state all the time, which is energy-saving and environmentally friendly, and can ensure its service life. The circuit structure is simple and the implementation cost is low.

The alarm circuit is a bluetooth signal transmitting module, which is mainly composed of a bluetooth baseband chip BC6145 and a bluetooth filter DBF81F107-CSR, and is used to transmit a baby bedwetting alarm signal to a bluetooth alarm device.

The bed-wetting alarm signal of the baby is transmitted wirelessly through the bluetooth, so that the alarm device can be carried around, the alarm signal is not easy to be missed, and the use is more convenient.

In order to provide a stable power supply and ensure reliable operation of the circuit, the model of the power chip U1 used is XC6204A182MR.

In order to facilitate unified management of each unit, a main power switch S1 is serially connected to the main output main line of the positive pole of the DC power supply.

The remarkable effect of the utility model is: the detection circuit controls the power supply of the alarm circuit according to the detected baby bedwetting signal, avoids the alarm circuit being in a charged state all the time, saves energy and protects the environment, and prolongs its service life. The circuit structure is simple, The implementation cost is low; the alarm signal is transmitted wirelessly through Bluetooth, so that the alarm device can be carried with you, it is not easy to miss the alarm signal, and it is more convenient to use.

Description of drawings

Fig. 1 is a schematic diagram of the power supply control circuit;

Fig. 2 is a schematic diagram of the alarm circuit.

Detailed ways

The specific embodiment and working principle of the present utility model will be described in further detail below in conjunction with the accompanying drawings.

As shown in Figure 1, a baby bedwetting detection circuit includes a humidity sensitive resistor R1 used to obtain the baby bedwetting signal, one end of the humidity sensitive resistor R1 is connected to the positive pole of the DC power supply, and the other end is connected to the base of the triode T2 through the resistor R3 , the collector of the transistor T2 is connected to the positive pole of the DC power supply through the resistor R2, the emitter of the transistor T2 is grounded, the collector of the transistor T2 is also connected to the base of the transistor T1, and the collector of the transistor T1 is connected to the DC power supply through the resistor RP1 Positive pole, the emitter of the triode T1 is grounded, the collector of the triode T1 is also connected to the positive pole of the Zener diode D1, the negative pole of the Zener diode D1 is connected to the enabling control terminal of the power chip U1, and the enabling control terminal is also grounded through the resistor R4 , the input end of the power chip U1 is connected to the positive pole of the DC power supply, and the output end of the power chip U1 supplies power to the alarm circuit.

It can also be seen from FIG. 1 that a main power switch S1 is serially connected to the output main line of the positive pole of the DC power supply; the power chip U1 adopts an LDO step-down regulator whose model is XC6204A182MR. As shown in the figure, the input end is the first pin, the output end is the fifth pin, the output voltage is 1.8V, and the enable control end is the third pin.

As shown in Figure 2, the alarm circuit is a bluetooth signal transmitting module, which is mainly composed of a bluetooth baseband chip BC6145 and a bluetooth filter DBF81F107-CSR, which is used to transmit a baby bedwetting alarm signal to a bluetooth alarm device. It can be seen from the figure that the output terminal of the power chip U1 in the power control circuit is respectively connected to the power input terminal and the interrupt signal input terminal of the BC6145 Bluetooth baseband chip.

The working principle of this circuit is:

Close the switch S1, in the case of no bedwetting, the resistance value of the humidity sensitive resistor R1 is very large, and the triode T2 is in the cut-off state. At this time, the collector of the triode T2 is at a high level, causing the triode T1 to be in the conduction state, and the Zener diode D1 The positive pole of the power chip U1 is at a low level, so the enable control terminal of the power chip U1 is in a low level state, and its output terminal has no output voltage;

When the baby’s bedwetting is detected, the resistance value of the humidity-sensitive resistor R1 becomes smaller, and the triode T2 is turned on, causing the triode T1 to be in the cut-off state, the anode of the Zener diode D1 is at a high level, and the enabling control terminal of the power chip U1 is at a high level. Flat, the output terminal of the power supply chip U1 outputs 1.8V voltage to supply power to the subsequent Bluetooth signal transmitting module. The Bluetooth signal transmitting module sends out a baby bedwetting signal, and then the Bluetooth alarm device wirelessly connected to it receives the signal and sends out a baby bedwetting alarm signal.

Claims (4)

1. A baby bed-wetting detection circuit, characterized in that: comprising a humidity sensitive resistor R1 for obtaining baby bed-wetting signals, one end of the humidity sensitive resistor R1 is connected to the positive pole of a DC power supply, and the other end is connected to the base of the triode T2 through a resistor R3 , the collector of the transistor T2 is connected to the positive pole of the DC power supply through the resistor R2, the emitter of the transistor T2 is grounded, the collector of the transistor T2 is also connected to the base of the transistor T1, and the collector of the transistor T1 is connected to the DC power supply through the resistor RP1 Positive pole, the emitter of the triode T1 is grounded, the collector of the triode T1 is also connected to the positive pole of the Zener diode D1, the negative pole of the Zener diode D1 is connected to the enabling control terminal of the power chip U1, and the enabling control terminal is also grounded through the resistor R4 , the input end of the power chip U1 is connected to the positive pole of the DC power supply, and the output end of the power chip U1 supplies power to the alarm circuit. 2. The baby bedwetting detection circuit according to claim 1, characterized in that: the alarm circuit is a bluetooth signal transmitting module, which is mainly composed of a bluetooth baseband chip BC6145 and a bluetooth filter DBF81F107-CSR, used for Send a baby bedwetting alarm signal to the Bluetooth alarm device. 3. The baby bed-wetting detection circuit according to claim 1, characterized in that: the model of the power chip U1 is XC6204A182MR. 4. The baby bed-wetting detection circuit according to claim 1, characterized in that: a main power switch S1 is connected in series with the output main line of the positive pole of the DC power supply.