CN102568259A - A story machine with an infant urine wet alarm function - Google Patents

Abstract

The invention discloses a story machine with a baby urine wetting alarm function; the monitoring device comprises a story machine body and a monitor, wherein the story machine body comprises a voice circuit, a urine humidity sensing circuit, a trigger circuit, a low-frequency oscillating circuit, a 49.86MHz oscillating circuit and a modulation transmitting circuit, the output end of the urine humidity sensing circuit is connected with the input end of the trigger circuit, the output end of the trigger circuit is connected with the input end of the low-frequency oscillating circuit, the output end of the low-frequency oscillating circuit is connected with the input end of the 49.86MHz oscillating circuit, the output end of the 49.86MHz oscillating circuit is connected with the modulation transmitting circuit, the monitor comprises a receiving demodulation circuit and a low-frequency amplifying circuit, and the output end of the receiving demodulation circuit is connected with the input end of the low-frequency amplifying. When the infant urinates wet, the story machine body senses the infant urinates wet and emits radio waves, and the monitor receives the radio waves and sends a prompt signal, so that the guardian can know the abnormal movement condition of the infant in time.

Description

A story machine with an infant urine wet alarm function

technical field

The invention relates to the technical field of story machines, in particular to a story machine with an infant urine wet alarm function.

Background technique

The story machine is an early education product for infants and young children. It can promote the intellectual development of infants and the balanced development of the left and right brains, stimulate interest in language learning, improve language expression and communication skills, and cultivate logical thinking, imagination, memory and creativity. force. The existing story machine includes a voice circuit, and the guardian controls the voice circuit to make it play stories, play music, etc.; when the story machine is in the working state of playing, the guardian may need to do housework without being around the infant, such as the guardian needs to cook, When washing clothes, etc., when the baby urinates wet, the guardian may not be able to know the abnormal situation of the baby in time.

Contents of the invention

The invention provides a story machine with an infant urine wetness alarm function, which can enable a guardian to know the abnormal movement of the infant in time.

A story machine with an infant urine wet alarm function, comprising a story machine body, the story machine body includes a voice circuit, the story machine also includes a monitor, and the story machine body also includes a urine wetness sensing circuit for sensing the baby's urine wetness , A trigger circuit for triggering the operation of a low-frequency oscillating circuit, a low-frequency oscillating circuit for controlling a 49.86MHz oscillating circuit to generate an oscillating signal, a 49.86MHz oscillating circuit, a modulation transmitting circuit for modulating an oscillating signal and emitting radio waves, urine wet The output end of the sensing circuit is connected to the input end of the trigger circuit, the output end of the trigger circuit is connected to the input end of the low-frequency oscillation circuit, the output end of the low-frequency oscillation circuit is connected to the input end of the 49.86MHz oscillation circuit, and the output end of the 49.86MHz oscillation circuit It is connected with the input terminal of the modulation and transmission circuit. The monitor includes a receiving and demodulating circuit for receiving radio waves and demodulating the oscillating signal, a low-frequency amplifying circuit for amplifying the oscillating signal and sending out a prompt signal, and the receiving and demodulating circuit The output end is connected with the input end of the low frequency amplifier circuit.

Wherein, the urine humidity sensing circuit includes a humidity sensor.

Among them, the trigger circuit includes NPN type transistor Q1, PNP type transistor Q2, capacitor C2, resistors R1, R6; one end of R6 is connected to the input end of the trigger circuit, the other end of R6 is connected to the base of Q1, and the collector of Q1 The electrode is connected to one end of R1, the other end of R1 is connected to the base of Q2, the emitter of Q2 is connected to the body power supply VCC, the collector of Q2, the positive pole of C2 are connected to the output terminal of the trigger circuit, the negative pole of C2, the Both emitters are grounded.

Among them, the low-frequency oscillation circuit includes NPN type transistor Q3, NPN type transistor Q4, resistors R2, R3, R4, R5, capacitors C1, C3; one end of R2, one end of R3, one end of R4, one end of R5 and low frequency oscillation The input terminal of the circuit is connected, the other end of R2, the base of Q3 are connected to one end of C3, the other end of R3, one end of C1 is connected to the collector of Q3, the other end of R4, the other end of C1 is connected to the base of Q4 Connect, the other end of R5, the other end of C3, the collector of Q4 are connected to the output end of the low frequency oscillation circuit, the emitter of Q3 and the emitter of Q4 are grounded.

Among them, the 49.86MHz oscillating circuit includes NPN type transistor Q5, crystal oscillator Y1, resistors R7, R8, R9, capacitors C4, C20, and inductor L1; one end of R8 is connected to the input end of the 49.86MHz oscillating circuit, the other end of R8, the The emitter, one end of C20, one end of R9, and one end of C4 are connected to the output end of the 49.86MHz oscillator circuit, the other end of R9 is grounded, one end of R7 and one end of L1 are connected to the body power supply VCC, the other end of R7, the One end is connected to the base of Q5, the other end of Y1, the other end of L1, the other end of C4, and the other end of C20 are connected to the collector of Q5.

Among them, the modulation transmitter circuit includes NPN type transistor Q6, inductors L2, L3, L4, resistor R11, capacitors C5, C6, C7, C8, C9, antenna; one end of C7, the base of Q6 and the input end of the modulation transmitter circuit Connection, one end of L2 is connected to the body power supply VCC, the other end of L2 and one end of C5 are connected to the collector of Q6, the emitter of Q6 and one end of R11 are connected to one end of C8, the other end of C5 and one end of C9 are connected to L3 One end of L3, one end of L4 are connected to one end of C6, the other end of L4 is connected to the antenna, the other end of C7, the other end of R11, the other end of C8, the other end of C9, and the other end of C6 Both are grounded.

Among them, the receiving demodulation circuit includes NPN type transistor Q8, inductors L5, L6, L8, resistors R10, R16, R17, R20, capacitors C12, C13, C14, C15, C16, C17, C18, C19, antenna; One end is connected to the antenna, the other end of L5 is connected to one end of C12, the other end of C12, one end of C13, one end of C14, and one end of L6 are connected to the collector of Q8, the other end of C14, the other end of L6, the other end of R10 One end, one end of C16, one end of R16, one end of C19 are connected to one end of C15, the other end of R10 is connected to the monitor power supply, the other end of C15 is connected to one end of R17, and the other end of R17 is connected to the output of the receiving demodulation circuit The other end of R16 and the positive pole of C18 are connected to the base of Q8, the other end of C13 and one end of L8 are connected to the emitter of Q8, the other end of L8 and one end of C17 are connected to one end of R20, and the other end of C17 One end, the other end of R20, the negative pole of C18, the other end of C19, and the other end of C16 are all grounded; the low-frequency amplifier circuit includes a speaker, NPN transistor Q9, inductor L7, resistors R18, R19; one end of R18, one end of L7 1. One end of the speaker is connected to the monitor power supply, the other end of R18, one end of R19, and the base of Q9 are connected to the input end of the low-frequency amplifier circuit, the other end of L7 and the other end of the speaker are connected to the collector of Q9, and the other end of R19 The other end, the emitter of Q9 are grounded.

Among them, the voice circuit includes a microcontroller, a display drive circuit, an LCD display, a sound amplifier circuit, and a control input circuit. The output end of the control input circuit is connected to the control input end of the microcontroller, and the audio output end of the microcontroller is connected to the sound The input terminal of the amplification circuit is connected, the video output terminal of the microcontroller is connected with the input terminal of the display driving circuit, and the output terminal of the display driving circuit is connected with the input terminal of the LCD display screen.

Wherein, the story machine body also includes a body power supply circuit and a power control circuit. The input end of the power control circuit is connected to the input end of the power control circuit, the power input end of the trigger circuit, the power input end of the low-frequency oscillation circuit, the power input end of the 49.86MHz oscillation circuit, and the modulation transmitter circuit. Power input connection.

Wherein, the monitor also includes a monitor power supply circuit, the output terminals of the monitor power supply circuit are respectively connected with the power input terminals of the receiving demodulation circuit and the power input terminals of the low frequency amplifier circuit.

Beneficial effects of the present invention: the story machine with infant urine wetness alarm function of the present invention includes a story machine body and a monitor, and the story machine body includes a voice circuit, a urine wetness sensing circuit, a trigger circuit, a low-frequency oscillation circuit, and a 49.86 MHz oscillation circuit , the modulation transmitter circuit, the output end of the urine wet sensing circuit is connected to the input end of the trigger circuit, the output end of the trigger circuit is connected to the input end of the low-frequency oscillation circuit, the output end of the low-frequency oscillation circuit is connected to the input end of the 49.86MHz oscillation circuit, The output end of the 49.86MHz oscillating circuit is connected to the input end of the modulating and transmitting circuit. The monitor includes a receiving demodulation circuit and a low frequency amplifying circuit. The output end of the receiving demodulating circuit is connected to the input end of the low frequency amplifying circuit. When the baby urinates wet, the story machine body senses the baby urinating and emits radio waves, and the monitor receives the radio waves and sends out a prompt signal, so that the guardian can be informed of the abnormal situation of the baby in time. When the guardian carries the monitor to do housework, it can effectively monitor infants and young children.

Description of drawings

Fig. 1 is a schematic structural view of the story machine body of the present invention.

Fig. 2 is a schematic structural diagram of the monitor of the present invention.

Fig. 3 is a circuit diagram of the urine wet sensing circuit, trigger circuit, low-frequency oscillation circuit, 49.86MHz oscillation circuit, modulation and emission circuit, and power control circuit of the present invention.

Fig. 4 is a circuit diagram of the receiving demodulation circuit, the low frequency amplifier circuit and the monitor power supply circuit of the present invention.

Fig. 5 is a circuit diagram of the first part of the speech circuit of the present invention.

Fig. 6 is a circuit diagram of the second part of the speech circuit of the present invention.

Fig. 7 is a circuit diagram of the third part of the speech circuit of the present invention.

Detailed ways

Referring to Figures 1 to 7, the present invention will be described in detail below in conjunction with the accompanying drawings.

A kind of story machine with infant urine wetness alarm function of the present embodiment, comprises story machine body, and story machine body comprises voice circuit, and story machine also comprises monitor, and story machine body also comprises the sensor that is used for sensing infant's urine wetness. Urine wet sensing circuit 101, a trigger circuit 102 for triggering the operation of the low-frequency oscillation circuit 103, a low-frequency oscillation circuit 103 for controlling the 49.86MHz oscillation circuit 104 to generate an oscillation signal, and a 49.86MHz oscillation circuit 104 for modulating the oscillation signal and The modulation transmitter circuit 105 that emits radio waves, the output end of the urine wet sensing circuit 101 is connected to the input end of the trigger circuit 102, the output end of the trigger circuit 102 is connected to the input end of the low-frequency oscillation circuit 103, and the output end of the low-frequency oscillation circuit 103 is connected to the input end of the low-frequency oscillation circuit 103. The input terminal of 49.86MHz oscillating circuit 104 is connected, and the output terminal of 49.86MHz oscillating circuit 104 is connected with the input terminal of modulating transmission circuit 105, and monitor comprises the reception demodulation circuit 201 that is used to receive radio wave and demodulate oscillating signal, uses The output end of the receiving demodulation circuit 201 is connected to the input end of the low frequency amplifier circuit 202 for amplifying the oscillating signal and sending out a prompt signal. The prompt signal sent by the low-frequency amplifying circuit 202 may be a sound signal, a light signal, an acousto-optic signal, a vibration signal, and the like. This story machine can also be used by children.

The speech circuit is used to play stories, play music, etc. In this embodiment, the voice circuit includes a microcontroller 109 , a display drive circuit 110 , an LCD display 112 , a sound amplification circuit 108 , and a control input circuit 111 . An output of the control input circuit 111 is connected to a control input of the microcontroller 109 . The control input circuit 111 may include various keys, and the guardian controls the operation of the voice circuit through the control input circuit 111 . The audio output terminal of the microcontroller 109 is connected with the input terminal of the sound amplification circuit 108 . The microcontroller 109 drives the sound amplifying circuit 108 to emit sound. The video output terminal of the microcontroller 109 is connected to the input terminal of the display driving circuit 110 , and the output terminal of the display driving circuit 110 is connected to the input terminal of the LCD screen 112 . The microcontroller 109 drives the LCD display 112 to display information. Fig. 5 to 7 are the circuit diagrams of the voice circuit of the present embodiment; because the circuit diagram of the voice circuit is too large, it is divided into three parts, and there is a clear connection relationship between the components of these three parts; for example, in Fig. 5, The 4th to 11th pins of the LCD chip are respectively connected to SEG0 to SEG7, and the 8th to 1st pins of the HT1621B chip are respectively connected to SEG0 to SEG7, which means that the 4th to 11th pins of the LCD chip are respectively connected to the 8th pins of the HT1621B chip. to 1-pin connection. It should be pointed out that, in addition to the voice circuit shown in Figures 5 to 7 provided by this embodiment, the present invention can also use the voice circuit of the prior art, and combine the voice circuit of the prior art with the infant urine wet circuit of this program The combination of alarm functions realizes the purpose of the present invention. The voice circuit in the prior art has various structures, which will not be repeated here.

The story machine body also includes a body power supply circuit 107, a power supply control circuit 106, and the output end of the body power supply circuit 107 is respectively connected with the power input end of the microcontroller 109, the power input end of the display drive circuit 110, and the power input end of the sound amplification circuit 108. 1. The input end of the power control circuit 106 is connected, and the output end of the power control circuit 106 is respectively connected with the power input end of the urine wet sensing circuit 101, the power input end of the trigger circuit 102, the power input end of the low frequency oscillation circuit 103, and the 49.86MHz oscillation circuit The power input end of 104 is connected with the power input end of the modulation transmitter circuit 105. In this embodiment, the power control circuit 106 includes a switch S1. When the guardian is around the infant, the infant urine wet alarm function of the story machine is turned off through the switch S1. When the guardian is not around the infant, the story machine is turned on through the switch S1. Baby urine wet alarm function.

The monitor also includes a monitor power supply circuit 203 , the output terminals of the monitor power supply circuit 203 are respectively connected to the power input terminals of the receiving demodulation circuit 201 and the power input terminals of the low frequency amplifier circuit 202 . In this embodiment, the monitor power supply circuit 203 includes a 4.5V power supply BT1 and a switch S2, and the monitor power supply can be controlled through the switch S2.

The urine wetness sensing circuit 101 includes a humidity sensor. The humidity sensor is a mature technology, so I won't go into details here. The humidity sensor can sense the urine wetness of infants and send out electrical signals.

The trigger circuit 102 includes an NPN type transistor Q1, a PNP type transistor Q2, a capacitor C2, and resistors R1 and R6; one end of R6 is connected to the input end of the trigger circuit 102, the other end of R6 is connected to the base of Q1, and the collector of Q1 The electrode is connected to one end of R1, the other end of R1 is connected to the base of Q2, the emitter of Q2 is connected to the body power supply VCC, the collector of Q2, the positive pole of C2 are connected to the output end of the trigger circuit 102, the negative pole of C2, Q1 The emitters are grounded. Figure 3 discloses the parameter values of the components and parts of the trigger circuit 102 of this embodiment; certainly, the parameter values of the components and parts can be adjusted according to the actual situation; It can be implemented to drive the low-frequency oscillation circuit 103 to work after receiving the electrical signal.

The low frequency oscillating circuit 103 includes an NPN type transistor Q3, an NPN type transistor Q4, resistors R2, R3, R4, R5, capacitors C1, C3; one end of R2, one end of R3, one end of R4, one end of R5 and the low frequency oscillating circuit The input terminal of 103 is connected, the other end of R2 and the base of Q3 are connected to one end of C3, the other end of R3 and one end of C1 are connected to the collector of Q3, the other end of R4 and the other end of C1 are connected to the base of Q4 connection, the other end of R5, the other end of C3, and the collector of Q4 are connected to the output end of the low-frequency oscillation circuit 103, and the emitters of Q3 and Q4 are grounded. 3 discloses the parameter values of the components and parts of the low-frequency oscillation circuit 103 of the present embodiment; certainly, the parameter values of the components and parts can be adjusted according to the actual situation; moreover, the specific components and parts of the circuit and their connection relationship can also be adjusted, As long as it can control the 49.86MHz oscillation circuit 104 to generate an oscillation signal.

The 49.86MHz oscillating circuit 104 includes an NPN type transistor Q5, a crystal oscillator Y1, resistors R7, R8, R9, capacitors C4, C20, and an inductance L1; one end of R8 is connected to the input end of the 49.86MHz oscillating circuit 104, the other end of R8, the The emitter, one end of C20, one end of R9, and one end of C4 are connected to the output end of the 49.86MHz oscillator circuit 104, the other end of R9 is grounded, one end of R7 and one end of L1 are connected to the main body power supply VCC, the other end of R7, Y1 One end of Y1 is connected to the base of Q5, the other end of Y1, the other end of L1, the other end of C4, and the other end of C20 are connected to the collector of Q5. Figure 3 discloses the parameter values of the components of the 49.86MHz oscillating circuit 104 of this embodiment; of course, the parameter values of the components can be adjusted according to actual conditions; moreover, the specific components and their connection relationship of the circuit can also be adjusted , as long as it can generate an oscillating signal.

The modulation transmitter circuit 105 comprises NPN type triode Q6, inductors L2, L3, L4, resistor R11, capacitors C5, C6, C7, C8, C9, antenna; one end of C7, the base of Q6 and the input terminal of the modulation transmitter circuit 105 Connection, one end of L2 is connected to the body power supply VCC, the other end of L2 and one end of C5 are connected to the collector of Q6, the emitter of Q6 and one end of R11 are connected to one end of C8, the other end of C5 and one end of C9 are connected to L3 One end of L3, one end of L4 are connected to one end of C6, the other end of L4 is connected to the antenna, the other end of C7, the other end of R11, the other end of C8, the other end of C9, and the other end of C6 Both are grounded. Figure 3 discloses the parameter values of the components and parts of the modulation transmitter circuit 105 of the present embodiment; certainly, the parameter values of the components and parts can be adjusted according to the actual situation; moreover, the specific components and parts of the circuit and their connection relationship can also be adjusted, As long as it can realize the modulation of the oscillating signal and the emission of radio waves.

The receiving demodulation circuit 201 includes NPN type transistor Q8, inductors L5, L6, L8, resistors R10, R16, R17, R20, capacitors C12, C13, C14, C15, C16, C17, C18, C19, antenna; one end of L5 Connect to the antenna, the other end of L5 is connected to one end of C12, the other end of C12, one end of C13, one end of C14, one end of L6 are connected to the collector of Q8, the other end of C14, the other end of L6, and one end of R10 , one end of C16, one end of R16, and one end of C19 are connected to one end of C15, the other end of R10 is connected to the monitor power supply, the other end of C15 is connected to one end of R17, and the other end of R17 is connected to the output of the receiving demodulation circuit 201 The other end of R16 and the positive pole of C18 are connected to the base of Q8, the other end of C13 and one end of L8 are connected to the emitter of Q8, the other end of L8 and one end of C17 are connected to one end of R20, and the other end of C17 One end, the other end of R20, the negative pole of C18, the other end of C19, and the other end of C16 are all grounded. Figure 4 discloses the parameter values of the components and parts of the receiving demodulation circuit 201 of this embodiment; certainly, the parameter values of the components and parts can be adjusted according to the actual situation; moreover, the specific components and parts of the circuit and their connection relationship can also be adjusted , as long as it can receive radio waves and demodulate oscillating signals.

Low-frequency amplifying circuit 202 comprises loudspeaker, the triode Q9 of NPN type, inductance L7, resistance R18, R19; One end of R18, one end of L7, one end of loudspeaker are connected with monitor power supply, the other end of R18, one end of R19, the base of Q9 The other end of L7 and the other end of the speaker are connected to the collector of Q9, and the other end of R19 and the emitter of Q9 are both grounded. In this embodiment, the prompt signal sent by the low-frequency amplifier circuit 202 is a sound signal. 4 discloses the parameter values of the components and parts of the low-frequency amplifying circuit 202 of the present embodiment; certainly, the parameter values of the components and parts can be adjusted according to the actual situation; As long as it can amplify the oscillating signal and issue a prompt signal.

The infant urine wet alarm process of the present invention is as follows. The story machine body can be placed next to the infant; the monitor can be placed next to the guardian, or the guardian can carry the monitor with him. When the baby is wet, the urine wetness sensing circuit 101 of the story machine body senses the baby's urine wetness, and converts the sensing signal into an electrical signal, which is sent to the trigger circuit 102 . After the trigger circuit 102 receives the electrical signal, it triggers the low frequency oscillation circuit 103 to work. The low-frequency oscillation circuit 103 controls the 49.86 MHz oscillation circuit to generate an oscillation signal, which is sent to the modulation and transmission circuit 105 . The modulation transmission circuit 105 modulates the oscillation signal and transmits radio waves. The receiving and demodulating circuit 201 of the monitor receives the radio wave and demodulates an oscillating signal, and the low-frequency amplifying circuit 202 amplifies the oscillating signal and sends out a prompt signal. According to the prompting signal, the guardian is notified of the abnormal movement of the infant in time, returns to the infant and takes care of it in time.

This embodiment adopts the specific circuit structure shown in Fig. 3-7, which has the advantages of simple structure, stable performance, low cost, and high cost performance, so that the present invention has a good market prospect.

3-7 disclose the parameter values and models of the components and parts of the circuits in this embodiment; it should be noted that the parameter values and models of the components and parts can be adjusted according to the actual situation. Modifications to the content of the present invention by persons of ordinary skill in the technical field without innovative efforts all belong to the scope of protection of the present invention.

The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. limits.

Claims (10)

1. Story machine that has infant's urine-wet alarm function; Comprise the Story machine body; The Story machine body comprises sound circuit; It is characterized in that: Story machine also comprises watch-dog; The Story machine body also comprise be used to respond to the infant urinate the wet sensor circuit of wet urine, be used to trigger low-frequency oscillatory network work trigger circuit, be used to control low-frequency oscillatory network, 49.86MHz oscillatory circuit that the 49.86MHz oscillatory circuit produces oscillator signal, be used for oscillator signal is modulated and the modulation transmitter of emitting radio wave; The output terminal of the wet sensor circuit of urine is connected with the input end of trigger circuit; The output terminal of trigger circuit is connected with the input end of low-frequency oscillatory network, and the output terminal of low-frequency oscillatory network is connected with the input end of 49.86MHz oscillatory circuit, and the output terminal of 49.86MHz oscillatory circuit is connected with the input end of modulation transmitter; Watch-dog comprises and is used to the receiving demodulation circuit that receives radiowave and demodulate oscillator signal, the low-frequency amplifier circuit that is used for oscillator signal is amplified and sends cue that the output terminal of receiving demodulation circuit is connected with the input end of low-frequency amplifier circuit.

2. a kind of Story machine that has infant's urine-wet alarm function according to claim 1 is characterized in that: the wet sensor circuit of said urine comprises humidity sensor.

3. a kind of Story machine that has infant's urine-wet alarm function according to claim 1 is characterized in that: said trigger circuit comprise the triode Q1 of NPN type, the triode Q2 of positive-negative-positive, capacitor C 2, resistance R 1, R6; The end of R6 is connected with the input end of trigger circuit; The other end of R6 is connected with the base stage of Q1; The collector of Q1 is connected with the end of R1, and the other end of R1 is connected with the base stage of Q2, and the emitter of Q2 is connected with body power supply VCC; The collector of Q2, the positive pole of C2 are connected with the output terminal of trigger circuit, the negative pole of C2, the equal ground connection of the emitter of Q1.

4. a kind of Story machine that has infant's urine-wet alarm function according to claim 1 is characterized in that: said low-frequency oscillatory network comprises the triode Q3 of NPN type, the triode Q4 of NPN type, resistance R 2, R3, R4, R5, capacitor C 1, C3; The end of the end of R2, the end of R3, R4, the end of R5 are connected with the input end of low-frequency oscillatory network; The other end of R2, the base stage of Q3 are connected with the end of C3; The end of the other end of R3, C1 is connected with the collector of Q3; The other end of R4, the other end of C1 are connected with the base stage of Q4, and the collector of the other end of R5, the other end of C3, Q4 is connected with the output terminal of low-frequency oscillatory network, the emitter of Q3, the equal ground connection of the emitter of Q4.

5. a kind of Story machine that has infant's urine-wet alarm function according to claim 1 is characterized in that: said 49.86MHz oscillatory circuit comprises the triode Q5 of NPN type, crystal oscillator Y1, resistance R 7, R8, R9, capacitor C 4, C20, inductance L 1; The end of R8 connects the input end of 49.86MHz oscillatory circuit; The end of the end of the other end of R8, the emitter of Q5, C20, the end of R9, C4 is connected with the output terminal of 49.86MHz oscillatory circuit; The other end ground connection of R9; The end of R7, the end of L1 are connected with body power supply VCC, and the end of the other end of R7, Y1 is connected with the base stage of Q5, and the other end of the other end of Y1, the other end of L1, C4, the other end of C20 are connected with the collector of Q5.

6. a kind of Story machine that has infant's urine-wet alarm function according to claim 1 is characterized in that: said modulation transmitter comprises the triode Q6 of NPN type, inductance L 2, L3, L4, resistance R 11, capacitor C 5, C6, C7, C8, C9, antenna; The end of C7, the base stage of Q6 are connected with the input end of modulation transmitter; The end of L2 is connected with body power supply VCC; The end of the other end of L2, C5 is connected with the collector of Q6; The end of the emitter of Q6, R11 is connected with the end of C8, and the end of the other end of C5, C9 is connected with the end of L3, and the end of the other end of L3, L4 is connected with the end of C6; The other end of L4 is connected with antenna, the equal ground connection of the other end of the other end of the other end of C7, the other end of R11, C8, the other end of C9, C6.

7. a kind of Story machine that has infant's urine-wet alarm function according to claim 1 is characterized in that:

Said receiving demodulation circuit comprises the triode Q8 of NPN type, inductance L 5, L6, L8, resistance R 10, R16, R17, R20, capacitor C 12, C13, C14, C15, C16, C17, C18, C19, antenna; The end of L5 is connected with antenna; The other end of L5 is connected with the end of C12; The end of the end of the other end of C12, C13, the end of C14, L6 is connected with the collector of Q8, and the end of the end of the other end of C14, the other end of L6, R10, the end of C16, R16, the end of C19 are connected with the end of C15, and the other end of R10 is connected with the watch-dog power supply; The other end of C15 is connected with the end of R17; The other end of R17 is connected with the output terminal of receiving demodulation circuit, and the other end of R16, the positive pole of C18 are connected with the base stage of Q8, and the end of the other end of C13, L8 is connected with the emitter of Q8; The end of the other end of L8, C17 is connected with the end of R20, the equal ground connection of the other end of the negative pole of the other end of C17, the other end of R20, C18, the other end of C19, C16;

Said low-frequency amplifier circuit comprises loudspeaker, the triode Q9 of NPN type, inductance L 7, resistance R 18, R19; One end of the end of R18, the end of L7, loudspeaker is connected with the watch-dog power supply; The end of the other end of R18, R19, the base stage of Q9 are connected with the input end of low-frequency amplifier circuit; The other end of L7, the other end of loudspeaker are connected with the collector of Q9, the other end of R19, the equal ground connection of the emitter of Q9.

8. a kind of Story machine that has infant's urine-wet alarm function according to claim 1; It is characterized in that: said sound circuit comprises microcontroller, display driver circuit, LCD display, sound amplifying circuit, control input circuit; The output terminal of control input circuit is connected with the control input end of microcontroller; The audio output of microcontroller is connected with the input end of sound amplifying circuit; The video output terminals of microcontroller is connected with the input end of display driver circuit, and the output terminal of display driver circuit is connected with the input end of LCD display.

9. a kind of Story machine that has infant's urine-wet alarm function according to claim 8; It is characterized in that: said Story machine body also comprises body power circuit, power control circuit; The output terminal of body power circuit is connected with the power input of microcontroller, the power input of display driver circuit, the power input of sound amplifying circuit, the input end of power control circuit respectively, and the output terminal of power control circuit is connected with the power input of the wet sensor circuit of urine, the power input of trigger circuit, the power input of low-frequency oscillatory network, the power input of 49.86MHz oscillatory circuit, the power input of modulation transmitter respectively.

10. a kind of Story machine that has infant's urine-wet alarm function according to claim 1; It is characterized in that: said watch-dog also comprises the watch-dog power circuit, and the output terminal of watch-dog power circuit is connected with the power input of receiving demodulation circuit, the power input of low-frequency amplifier circuit respectively.

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