CN214098599U

CN214098599U - Intelligent noise detection and alarm circuit with adjustable alarm threshold

Info

Publication number: CN214098599U
Application number: CN202120096583.8U
Authority: CN
Inventors: 徐通; 赵鑫; 吴登勇
Original assignee: Xian Chaoyue Shentai Information Technology Co Ltd
Current assignee: Xian Chaoyue Shentai Information Technology Co Ltd
Priority date: 2021-01-14
Filing date: 2021-01-14
Publication date: 2021-08-31
Anticipated expiration: 2031-01-14

Abstract

The utility model provides an adjustable intelligent noise of alarm threshold detects and warning circuit, the microphone is used for gathering the noise and turns into the signal of telecommunication with the acoustic signal, rheostat is used for adjusting the size of gathering the signal of telecommunication, ensure that the signal of telecommunication of the integrated power amplifier of input audio frequency is undistorted, electric capacity III is used for increasing the gain of the integrated power amplifier of audio frequency, resistance III is pull-up resistance, be used for with the electric potential clamp at the high level, play the current-limiting effect simultaneously, resistance II is current-limiting resistance, play the effect of stabilizing the branch road current, electric capacity IV is filter capacitor, reduce the alternating current ripple coefficient of the electric current of inputing to the controller, electric capacity V is filter capacitor, be used for reducing the alternating current ripple coefficient of the integrated power amplifier output current of audio frequency, resistance IV is current-limiting resistance, play and stabilize the branch road current and play the current-limiting effect. The audio integrated power amplifier amplifies signals collected by the microphone and inputs the amplified signals into the controller, and when noise exceeds a threshold value prestored in the controller, the controller drives the buzzer to give an alarm.

Description

Intelligent noise detection and alarm circuit with adjustable alarm threshold

Technical Field

The utility model relates to a noise detection technical field, concretely relates to adjustable intelligent noise of alarm threshold detects and warning circuit.

Background

At present, a common 89C51 single chip microcomputer is adopted by a mainstream noise detection and alarm circuit, an integrated A/D conversion module is not arranged inside the mainstream noise detection and alarm circuit, the A/D conversion module needs to be added during circuit design, the complexity of a circuit structure is increased, the system stability is not facilitated, an alarm threshold value cannot be adjusted according to an actual application scene, and the application scene is limited.

Disclosure of Invention

The utility model discloses an overcome not enough of above technique, provide a circuit design and simplify to can carry out the circuit that sets up to the alarm threshold value according to using the scene.

The utility model overcomes the technical scheme that its technical problem adopted is:

an adjustable intelligent noise detection of alarm threshold and warning circuit includes:

the P3.0 pin of the controller is grounded through a resistor III and is connected to the OUT pin of the audio integrated power amplifier through a resistor II and a capacitor IV respectively, the OUT pin of the audio integrated power amplifier is grounded through a capacitor V and a resistor IV which are connected IN series, the VCC pin of the audio integrated power amplifier is connected to a power supply, the PYPASS pin of the audio integrated power amplifier is grounded through a capacitor VII, a capacitor III is connected between two GAIN pins of the audio integrated power amplifier, the IN-pin of the capacitor III is grounded, the GND pin of the capacitor III is grounded, the IN + pin of the audio integrated power amplifier is connected to the sliding blade end of a speed changer, one end of the speed changer is grounded, the other end of the speed changer is connected to a microphone through a capacitor II and is connected to the power supply through a resistor I respectively, the other end of the microphone is grounded, and the capacitor I and the microphone are connected IN parallel;

the GND pin of the self-locking switch is grounded, the VCC pin of the self-locking switch is connected to one end of an jack for connecting a DC power plug, and the other end of the jack is connected with the AVDD pin of the controller;

the positive pole of the buzzer is connected with a power supply, the negative pole of the buzzer is connected with the emitting electrode of the transistor I, the collecting electrode of the transistor I is grounded, and the base electrode of the transistor I is connected with the P3.5 pin of the controller through the resistor V.

Preferably, the controller is an MSC1210 controller.

Further, still include button I, button I includes count-up button, count-down button, sets for the button, confirms the button, and four buttons are connected respectively in the P3.1 pin, P3.2 pin, P3.3 pin, the P3.4 pin of controller.

In order to display noise decibels, the digital tube is a four-in-one and sun-sharing digital tube, the selection ends of the digital tube are respectively connected to a P0.0 pin, a P0.1 pin, a P0.2 pin, a P0.3 pin, a P0.4 pin, a P0.5 pin, a P0.6 pin and a P0.7 pin of a controller through 7 resistors VIII, the position selection ends of the digital tube are respectively connected to the collector electrodes of 4 transistors II, the emitting electrode of the transistor II is connected to a power supply, and the base electrodes of the 4 transistors II are respectively connected to the P2.7 pin, the P2.6 pin, the P2.5 pin and the P2.4 pin of the controller through a resistor IX.

In order to display the power-on state of the system, the system further comprises an LED, the cathode of the LED is grounded, and the anode of the LED is connected to an AVDD pin of the controller through a resistor VII.

In order to realize reset, the reset circuit further comprises a key II, one end of the key II is grounded through a resistor VI, the other end of the key II is connected to the RST pin of the power supply and the controller respectively, and a capacitor VI is connected with the key II in parallel.

Preferably, the audio integrated power amplifier is an LM386 chip.

The utility model has the advantages that: the microphone is used for collecting noise and converting an acoustic signal into an electric signal, the capacitor I and the capacitor II are used for filtering the signal, the rheostat is used for adjusting the size of the collected electric signal to ensure that the electric signal input into the audio integrated power amplifier is not distorted, the capacitor III is used for increasing the gain of the audio integrated power amplifier, the resistor III is a pull-up resistor and is used for clamping the electric potential at a high level and plays a role in limiting the current, the resistor II is a current-limiting resistor and plays a role in stabilizing the branch current, the capacitor IV is a filter capacitor and is used for reducing the alternating current ripple coefficient of the current input into the controller, the capacitor V is a filter capacitor and is used for reducing the alternating current ripple coefficient of the output current of the audio integrated power amplifier, and the resistor IV is a current-limiting resistor and plays a role in stabilizing the branch current and limiting the current. And the capacitor VII is a bypass capacitor and is used for filtering high-frequency noise. The audio integrated power amplifier amplifies signals collected by the microphone and inputs the signals into the controller, and when noise exceeds a threshold value prestored in the controller, the controller drives the buzzer to give an alarm, so that the noise detection and alarm circuit with the adjustable alarm threshold value is realized.

Drawings

FIG. 1 is a circuit diagram of the present invention;

FIG. 2 is a block diagram of the controller of the present invention;

fig. 3 is a structural diagram of the audio integrated power amplifier of the present invention;

FIG. 4 is a structural diagram of the self-locking switch of the present invention;

in the figure, 1, a controller 2, a microphone 3, a capacitor I4, a capacitor II 5, a resistor I6, a rheostat 7, an audio integrated power amplifier 8, a capacitor III 9, a resistor II 10, a resistor III 11, a capacitor IV 12, a capacitor V13, a resistor IV 14, a key I15, a buzzer 16, a transistor I17, a resistor V18, a resistor VI 19, a key II 20, a capacitor VI 21, a self-locking switch 22, a jack 23, a resistor VII 24, an LED 25, a resistor VIII 26, a transistor II 27, a resistor IX 28, a digital tube 29 and a capacitor VII are shown.

Detailed Description

The present invention will be further described with reference to fig. 1 to 4.

An adjustable intelligent noise detection of alarm threshold and warning circuit includes: the controller 1, its P3.0 base pin is grounded through resistance III 10 and connected to OUT base pin of the integrated power amplifier 7 of the audio frequency through resistance II 9 and electric capacity IV 11 separately, OUT base pin of the integrated power amplifier 7 of the audio frequency is grounded after electric capacity V12 and resistance IV 13 connected IN series each other, VCC base pin of the integrated power amplifier 7 of the audio frequency is connected to the power, its PYPASS base pin is grounded through electric capacity VII 29, connect with electric capacity III 8 between its two GAIN base pins, its IN-base pin is grounded, its GND base pin is grounded, its IN + base pin is connected to the slip sheet end of the speed change gear 6, one end of the speed change gear 6 is grounded, its another end is connected to microphone 2 and connected to the power through electric capacity II 4 separately, another end of the microphone 2 is grounded, electric capacity I3 and microphone 2 are connected IN parallel each other; a GND pin of the self-locking switch 21 is grounded, a VCC pin of the self-locking switch is connected to one end of a jack 22 for connecting a DC power plug, and the other end of the jack 22 is connected with an AVDD pin of the controller 1; the buzzer 15 has its positive pole connected to the power supply and its negative pole connected to the emitter of the transistor i 16, the collector of the transistor i 16 is grounded, and the base of the transistor i 16 is connected to the pin P3.5 of the controller 1 through the resistor v 17. The resistor I5 is a pull-up resistor and is used for clamping the electric potential at a high level and playing a role of limiting current, the microphone 2 is used for collecting noise and converting an acoustic signal into an electric signal, the capacitor I3 and the capacitor II 4 are used for filtering the signal, the rheostat 6 is used for adjusting the size of the collected electric signal and ensuring that the electric signal input into the audio integrated power amplifier 7 is undistorted, the capacitor III 8 is used for increasing the gain of the audio integrated power amplifier 7, the resistor III 10 is a pull-up resistor and is used for clamping the electric potential at the high level and playing a role of limiting current, the resistor II 9 is a current limiting resistor and plays a role of stabilizing branch current, the capacitor IV 11 is a filter capacitor and reduces the alternating current ripple coefficient of the current input into the controller 1, the capacitor V12 is a filter capacitor and is used for reducing the alternating current ripple coefficient of the current output by the audio integrated power amplifier 7, and the resistor IV 13 is a current limiting resistor, the current stabilizing branch circuit plays a role in stabilizing branch circuit current and limiting current. And the capacitor VII 29 is a bypass capacitor and is used for filtering high-frequency noise. The audio integrated power amplifier 7 amplifies signals collected by the microphone 2 and inputs the amplified signals into the controller 1, and when noise exceeds a threshold value prestored in the controller 1, the controller 1 drives the buzzer 15 to give an alarm, so that a noise detection and alarm circuit with an adjustable alarm threshold value is realized.

Further, still include button I14, include count-up button, count-down button, set for the button, confirm the button in button I14, four buttons are connected respectively in P3.1 pin, P3.2 pin, P3.3 pin, the P3.4 pin of controller 1. The setting key, the count-up key and the count-down key are used for setting an alarm threshold value, and the confirmation key is used for confirming the set alarm threshold value.

Further, the digital tube 28 is a four-in-one and sun-sharing digital tube, the selection ends of the digital tube 28 are respectively connected to a P0.0 pin, a P0.1 pin, a P0.2 pin, a P0.3 pin, a P0.4 pin, a P0.5 pin, a P0.6 pin and a P0.7 pin of the controller 1 through 7 resistors viii 25, the position selection ends of the digital tube are respectively connected to the collectors of 4 transistors ii 26, the emitter of the transistor ii 26 is connected to the power supply, and the bases of the 4 transistors ii 26 are respectively connected to a P2.7 pin, a P2.6 pin, a P2.5 pin and a P2.4 pin of the controller 1 through resistors ix 27. The nixie tube 28 is used for displaying noise decibels, the 4 transistors II 26 are used for increasing current so as to drive the nixie tube 28 to work, and the resistor IX 27 is a current-limiting resistor and plays a role in stabilizing branch current.

Further, the LED24 is further included, the cathode of the LED is grounded, and the anode of the LED is connected to an AVDD pin of the controller 1 through a resistor VII 23. The LED24 is used to display the system power-on state, the current drives the LED24 to emit light, and when the system is powered on, the LED24 emits light to show that the system is powered on, and when the power supply is disconnected, the LED24 is off. The resistor VII 23 is a pull-up resistor and is used for clamping the potential at a high level and playing a role in current limiting.

Furthermore, the controller also comprises a key II 19, one end of the key II 19 is grounded through a resistor VI 18, the other end of the key II 19 is respectively connected with a power supply and a RST pin of the controller 1, and a capacitor VI 20 is connected with the key II 19 in parallel. The key II 19 is a reset key and is used for resetting a set alarm value and an alarm state after the alarm threshold value is reached, and the capacitor VI 20 is a bypass capacitor and is used for filtering high-frequency noise. And the resistor VI 18 is a pull-down resistor and is used for clamping the potential at a low level and simultaneously playing a role in limiting the current.

Preferably, the controller 1 is an MSC1210 controller. The audio integrated power amplifier is an LM386 chip.

The above description is only the preferred embodiment of the present invention, which is only used to illustrate the technical solution of the present invention, and is not used to limit the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention is included in the protection scope of the present invention.

Claims

1. An adjustable intelligent noise detection of alarm threshold and warning circuit which characterized in that includes:

a P3.0 pin of the controller (1) is respectively connected with the ground through a resistor III (10) and an OUT pin of the audio integrated power amplifier (7) through a resistor II (9) and a capacitor IV (11), the OUT pin of the audio integrated power amplifier (7) is connected with the ground through a capacitor V (12) and a resistor IV (13) which are mutually connected in series, a VCC pin of the audio integrated power amplifier (7) is connected with a power supply, the PYPASS pin is grounded through a capacitor VII (29), a capacitor III (8) is connected between the two GAIN pins, the IN-pin is grounded, the GND pin is grounded, the IN + pin is connected with the slip sheet end of the speed changer (6), one end of the speed changer (6) is grounded, the other end of the capacitor I (3) is connected with the microphone (2) through a capacitor II (4) and is connected with a power supply through a resistor I (5), the other end of the microphone (2) is grounded, and the capacitor I (3) and the microphone (2) are mutually connected in parallel;

the GND pin of the self-locking switch (21) is grounded, the VCC pin of the self-locking switch is connected to one end of a jack (22) for connecting a DC power plug, and the other end of the jack (22) is connected with the AVDD pin of the controller (1);

and the positive electrode of the buzzer (15) is connected with a power supply, the negative electrode of the buzzer is connected with the emitting electrode of the transistor I (16), the collecting electrode of the transistor I (16) is grounded, and the base electrode of the transistor I (16) is connected with the P3.5 pin of the controller (1) through a resistor V (17).

2. The adjustable alarm threshold intelligent noise detection and alarm circuit of claim 1, wherein: the controller (1) is an MSC1210 controller.

3. The adjustable alarm threshold intelligent noise detection and alarm circuit of claim 1, wherein: still include button I (14), button I (14) include count the button, subtract count the button, set for the button, confirm the button, four buttons are connected respectively in P3.1 pin, P3.2 pin, P3.3 pin, the P3.4 pin of controller (1).

4. The adjustable alarm threshold intelligent noise detection and alarm circuit of claim 1, wherein: the digital tube (28) is a four-in-one and sun-sharing digital tube, the selection ends of the digital tube are respectively connected with a P0.0 pin, a P0.1 pin, a P0.2 pin, a P0.3 pin, a P0.4 pin, a P0.5 pin, a P0.6 pin and a P0.7 pin of the controller (1) through 7 resistors VIII (25), the position selection ends of the digital tube are respectively connected with the collecting electrodes of 4 transistors II (26), the emitting electrode of the transistor II (26) is connected with a power supply, and the base electrodes of the 4 transistors II (26) are respectively connected with a P2.7 pin, a P2.6 pin, a P2.5 pin and a P2.4 pin of the controller (1) through resistors IX (27).

5. The adjustable alarm threshold intelligent noise detection and alarm circuit of claim 1, wherein: the LED controller also comprises an LED (24), the cathode of the LED is grounded, and the anode of the LED is connected to an AVDD pin of the controller (1) through a resistor VII (23).

6. The adjustable alarm threshold intelligent noise detection and alarm circuit of claim 1, wherein: the LED lamp further comprises a key II (19), one end of the key II (19) is grounded through a resistor VI (18), the other end of the key II (19) is connected to the RST pin of the power supply and the controller (1) respectively, and a capacitor VI (20) is connected with the key II (19) in parallel.

7. The adjustable alarm threshold intelligent noise detection and alarm circuit of claim 1, wherein: the audio integrated power amplifier is an LM386 chip.