CN218497628U

CN218497628U - Alarm circuit capable of automatically sensing ambient light intensity

Info

Publication number: CN218497628U
Application number: CN202220735155.XU
Authority: CN
Inventors: 陈战东; 吴国彪
Original assignee: Guangxi University for Nationalities
Current assignee: Guangxi University for Nationalities
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2023-02-17
Anticipated expiration: 2032-03-31

Abstract

The utility model relates to an electronic information technical field specifically is an automatic alarm circuit of response surrounding environment luminous intensity, including power module, pilot lamp circuit module, partial pressure drive circuit module, alarm circuit module. Through the photosensitive characteristic of make full use of photo resistance and the switching characteristic of triode, mainly adopt two photo resistance as photosensitive element, four triodes are as on-off control component, three emitting diode LED and a bee calling organ are as audible and visual alarm suggestion, a simple structure is designed, therefore, the cost is low, the volume is less, need not the warning circuit of complicated preparation technology, can detect study by instant accuracy, the illumination condition of during operation surrounding environment, in time send out the warning suggestion that illumination is not good (weak or too strong), effectively solve because of the not good tired myopia scheduling problem of eyes that causes of illumination.

Description

Alarm circuit capable of automatically sensing ambient light intensity

Technical Field

The utility model relates to an electronic information technical field specifically is an automatic alarm circuit of response surrounding environment luminous intensity.

Background

At present, the study and work tasks of primary and secondary school students and common office workers are heavy, the eyes are easy to be myopic when the eyes are used excessively, and the myopia of the eyes can be aggravated if the illumination of the study and work environment is poor, such as too strong or too weak. Scientific research shows that the light intensity range suitable for reading and writing by human eyes is about 300-600Lux, the illumination condition of the learning and working environment of most people can change along with the change of time, weather and places, and once people carefully learn and work with full concentration, the change of the illumination condition can be ignored frequently. At present, special measuring equipment capable of measuring illuminance is available in the market, but the general size is large, the price is high, professional requirements are required during operation and use, and an alarm prompt function is not provided usually, so that the special measuring equipment is not suitable for common students or office staff.

SUMMERY OF THE UTILITY MODEL

To the problem that exists, the utility model relates to an automatic alarm circuit of response surrounding environment luminous intensity. Through the photosensitive characteristic of make full use of photo resistance and the switching characteristic of triode, mainly adopt two photo resistance as photosensitive element, four triodes are as on-off control component, three emitting diode LED and a bee calling organ are as audible and visual alarm suggestion, adopt nine conventional resistances as auxiliary component in addition, a simple structure is designed out, therefore, the clothes hanger is low in cost, small in size, need not the alarm circuit of complicated preparation technology, can the instant accurate illumination condition that detects study operational environment, in time send the not good warning suggestion of illumination, effectively solve because of the not good (too weak or too strong) illumination causes the tired myopia scheduling problem of eyes.

The utility model adopts the technical proposal that:

an alarm circuit for automatically sensing the intensity of ambient light, comprising: the alarm circuit comprises a power supply module, a first output end of the power supply module is connected with a power supply input end of the indicator lamp circuit module, a second output end of the power supply module is connected with a power supply input end of the alarm circuit module, a third output end, a fourth output end, a fifth output end and a sixth output end of the power supply module are respectively connected with a first signal input end, a second signal input end, a third signal input end and a fourth signal input end of the voltage division driving circuit module in a one-to-one correspondence manner, and a first driving signal output end and a second driving signal output end of the voltage division driving circuit module are respectively connected with a first signal input end and a second signal input end of the alarm circuit module;

the power module comprises a battery pack E and a switch K, the indicator light circuit module comprises a first light emitting diode LED1, the anode of the first light emitting diode LED1 is connected with the anode of the battery pack E through the switch K, the cathode of the first light emitting diode LED1 is connected with the cathode of the battery pack E through a first resistor R1, and the cathode of the battery pack E is grounded;

the voltage division driving circuit module comprises a second sliding resistor R2 and a fourth sliding resistor R4, the fixed end of the second sliding resistor R2 is connected with the anode of the battery pack E through a first photoresistor PR1 and a switch K, the moving end of the second sliding resistor R2 is connected with the cathode of the battery pack E, the common end of the second sliding resistor R2 and the first photoresistor PR1 is connected with the base electrode of the first triode VT1 through a third resistor R3, the fixed end of the fourth sliding resistor R4 is connected with the anode of the battery pack E through the switch K, the moving end of the fourth sliding resistor R4 is connected with the cathode of the battery pack E through the second photoresistor PR2, the common end of the fourth sliding resistor R4 and the second photoresistor PR2 is connected with the base electrode of the second triode VT2 through a fifth resistor R5, the collector electrode of the first triode VT1 is connected with the anode of the battery pack E through a sixth resistor R6 and a switch K, the emitter electrode of the first triode VT1 is connected with the cathode of the battery pack E, the collector electrode of the second triode VT2 is connected with the emitter electrode of the second triode VT2, and the collector electrode of the triode VT2 is connected with the emitter electrode of the triode VT 2;

the alarm circuit module includes bee calling organ H, bee calling organ H's positive input end is connected with group battery E's positive pole through switch K, bee calling organ H's negative input end is connected with second emitting diode LED 2's positive pole all the way, second emitting diode LED 2's negative pole is connected with third triode VT 3's collecting electrode, third triode VT 3's base is connected with first triode VT 1's collecting electrode through eighth resistance R8, third triode VT 3's projecting pole is connected with group battery E's negative pole, bee calling organ H negative input end's another way is connected with third emitting diode LED 3's positive pole, third emitting diode LED 3's negative pole is connected with fourth triode VT 4's collecting electrode, fourth triode VT 4's base is connected with second triode VT 2's collecting electrode through ninth resistance R9, fourth triode VT 4's projecting pole is connected with group battery E's negative pole.

The working principle is as follows: the characteristic that the resistance value of the photoresistor changes along with the change of illumination intensity and the switching characteristic of the triode are fully utilized, and when the illumination intensity is increased or decreased, the resistance value of the photoresistor is gradually decreased or increased, so that the voltage division value of the photoresistor in the circuit is changed. The on-off of the triode is controlled through the change of the partial pressure value, so that the light emitting diode LED and the buzzer send out corresponding sound and light alarm prompts.

Further, the battery pack E is a direct current 5V.

Further, the first light emitting diode LED1 is a green light emitting diode, the second light emitting diode LED2 is a blue light emitting diode, and the third light emitting diode LED3 is a red light emitting diode.

Further, the first photo-resistor PR1 and the second photo-resistor PR2 are both dark resistors and have resistance values of 1M Ω.

Furthermore, the first triode VT1, the second triode VT2, the third triode VT3 and the fourth triode VT4 are all NPN-type triodes.

Further, the maximum resistance values of the second sliding resistor R2 and the fourth sliding resistor R4 are both 10K Ω.

To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that:

the utility model relates to an automatic alarm circuit of response surrounding environment luminous intensity, can the light intensity change of the real-time accurate detection study operational environment of ability, when the light intensity of environment of locating is less than 300Lux or is higher than 600Lux, in time accurate send the too weak or strong warning suggestion of light intensity, the illumination of warning current environment is not good, avoid during people's eyes are in bad illumination environment for a long time, effectively reduce the probability that eyes myopia takes place, and can change the alarm threshold value of dim light or highlight according to actual need. Simultaneously the utility model relates to a scientific and reasonable, simple structure, required electronic components all can purchase through market conventional channel, low price and energy-concerving and environment-protective, need not complicated technology during the preparation, consequently but mass production has the prospect of extensive application and popularization, has obtained good economic benefits and social after the input use.

Drawings

In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings required in the implementation examples or the description of the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some examples of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive step.

FIG. 1 is a block diagram of an alarm circuit for automatically sensing ambient light intensity;

fig. 2 is a schematic diagram of an alarm circuit for automatically sensing the intensity of ambient light.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the examples of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Example (b):

as shown in fig. 1, an alarm circuit capable of automatically sensing the intensity of ambient light includes a power module, a first output end of the power module is connected to a power input end of an indicator light circuit module, a second output end of the power module is connected to a power input end of the alarm circuit module, a third output end, a fourth output end, a fifth output end, and a sixth output end of the power module are respectively connected to a first signal input end, a second signal input end, a third signal input end, and a fourth signal input end of a voltage division driving circuit module in a one-to-one correspondence manner, and a first driving signal output end and a second driving signal output end of the voltage division driving circuit module are respectively connected to a first signal input end and a second signal input end of the alarm circuit module;

as shown in fig. 2, the power module includes a battery pack E and a switch K, the battery pack E is a direct current 5V, the indicator light circuit module includes a first light emitting diode LED1, the first light emitting diode LED1 is a green light emitting diode, an anode of the first light emitting diode LED1 is connected to an anode of the battery pack E through the switch K, a cathode of the first light emitting diode LED1 is connected to a cathode of the battery pack E through a first resistor R1, and a cathode of the battery pack E is grounded;

the voltage division driving circuit module comprises a second sliding resistor R2 and a fourth sliding resistor R4, the maximum resistance values of the second sliding resistor R2 and the fourth sliding resistor R4 are both 10K omega, the fixed end of the second sliding resistor R2 is connected with the anode of the battery pack E through a first photoresistor PR1 and a switch K, the first photoresistor PR1 is a dark resistor and has a resistance value of 1M omega, the movable end of the second sliding resistor R2 is connected with the cathode of the battery pack E, the common end of the second sliding resistor R2 and the first photoresistor PR1 is connected with the base of a first triode VT1 through a third resistor R3, the fixed end of the fourth sliding resistor R4 is connected with the anode of the battery pack E through the switch K, the movable end of the fourth sliding resistor R4 is connected with the cathode of the battery pack E through the second photoresistor PR2, and the second photoresistor PR2 is a dark resistor and has a resistance value of 1M omega;

the common end of the fourth sliding resistor R4 and the second photoresistor PR2 is connected with the base electrode of the second triode VT2 through a fifth resistor R5, the collector electrode of the first triode VT1 is connected with the anode of the battery pack E through a sixth resistor R6 and a switch K, the emitter electrode of the first triode VT1 is connected with the cathode of the battery pack E, the collector electrode of the second triode VT2 is connected with the anode of the battery pack E through a seventh resistor R7 and the switch K, and the emitter electrode of the second triode VT2 is connected with the cathode of the battery pack E;

the alarm circuit module comprises a buzzer H, wherein the positive input end of the buzzer H is connected with the positive electrode of a battery pack E through a switch K, one path of the negative input end of the buzzer H is connected with the anode of a second light-emitting diode LED2, the second light-emitting diode LED2 is a blue light-emitting diode, the cathode of the second light-emitting diode LED2 is connected with the collector of a third triode VT3, the base of the third triode VT3 is connected with the collector of a first triode VT1 through an eighth resistor R8, the emitter of the third triode VT3 is connected with the negative electrode of the battery pack E, the other path of the negative input end of the buzzer H is connected with the anode of the third light-emitting diode LED3, the third light-emitting diode LED3 is a red light-emitting diode, the cathode of the third light-emitting diode LED3 is connected with the collector of a fourth triode VT4, the base of the fourth triode VT4 is connected with the collector of the second triode VT2 through a ninth resistor R9, and the emitter of the fourth triode VT4 is connected with the negative electrode of the battery pack E;

the first triode VT1, the second triode VT2, the third triode VT3 and the fourth triode VT4 are all NPN type triodes.

The utility model discloses a working process as follows:

when the switch K is closed, the light emitting diode LED1 emits green light, namely the power supply indicator light is green, and the circuit is normally electrified;

when the illumination intensity of the environment is less than 300Lux, namely when the environment is in a weak light state, the resistance values of the photoresistors PR1 and PR2 are large, the resistance value of the photoresistors PR1 is large, so that the fixed end voltage of the sliding resistor R2 is lower than 0.7V, namely the base voltage of the triode VT1 is lower than 0.7V, at the moment, the triode VT1 is in a disconnected state, the collector of the triode VT1 is in a high potential, namely the base voltage of the triode VT3 is larger than 0.7V, therefore, the triode VT3 is conducted, the light emitting diode LED2 emits blue alarm light, namely the weak light indicator light is lightened, and meanwhile, the buzzer emits alarm sound. The larger resistance of the photoresistor PR2 enables the voltage of the moving end of the sliding resistor R4 to be larger than 0.7V, namely the base voltage of the triode VT2 is larger than 0.7V, the triode VT2 is conducted, therefore, the collector of the triode VT2 is at a low potential, namely the base voltage of the triode VT4 is smaller than 0.7V, the triode VT4 is cut off, the light emitting diode LED3 does not emit light, namely the light intensity indicator lamp does not light.

When the illumination intensity of the environment is larger than 600Lux, namely when the environment is in a strong light state, the resistance values of the photoresistors PR1 and PR2 are smaller, the resistance value of the photoresistors PR1 is smaller, so that the voltage of the fixed end of the sliding resistor R2 is higher than 0.7V, namely the voltage of the base electrode of the triode VT1 is higher than 0.7V, the triode VT1 is conducted, at the moment, the collector electrode of the triode VT1 is in a low potential, namely the voltage of the base electrode of the triode VT3 is smaller than 0.7V, the triode VT3 is cut off, the light-emitting diode LED2 does not emit light, namely the light-weak indicating lamp does not emit light. The resistance value of the photoresistor PR2 is small, so that the voltage of the moving end of the sliding resistor R4 is smaller than 0.7V, namely the base electrode of the triode VT2 is at a low potential, the triode VT2 is cut off, at the moment, the collector electrode of the triode VT2 is at a high potential, namely the base electrode voltage of the triode VT4 is larger than 0.7V, the triode VT4 is conducted, the light emitting diode LED3 emits red alarm light, namely, the light intensity indicator light is on, and the buzzer emits alarm sound.

When the illumination intensity of the environment is suitable, namely the environment is between 300Lux and 600Lux, the resistance values of the photoresistor PR1 and the photoresistor PR2 are moderate, the resistance value of the photoresistor PR1 is moderate, so that the voltage of the fixed end of the sliding resistor R2 is higher than 0.7V, namely the voltage of the base electrode of the triode VT1 is higher than 0.7V, the triode VT1 is conducted, at the moment, the collector electrode of the triode VT1 is at a low potential, namely the voltage of the base electrode of the triode VT3 is lower than 0.7V, the triode VT3 is cut off, and the light-emitting diode LED2 does not emit light. Meanwhile, the resistance value of the photoresistor PR2 is moderate, so that the mobile terminal voltage of the sliding resistor R4 is larger than 0.7V, namely the base voltage of the triode VT2 is larger than 0.7V, the triode VT2 is conducted, at the moment, the collector electrode of the triode VT2 is at a low potential, namely the base voltage of the triode VT4 is smaller than 0.7V, the triode VT4 is cut off, the light-emitting diode LED3 does not emit light, namely, the weak light indicator lamp and the light intensity indicator lamp are not on at the moment, and meanwhile, the buzzer does not give out alarm sound.

If the alarm threshold value in the weak light or the light intensity is required to be changed, the alarm threshold value can be realized by adjusting the resistance value of the sliding resistor R2 or the sliding resistor R4.

The above description is only for the preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements and the like made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims

1. An alarm circuit for automatically sensing the intensity of ambient light, comprising: the alarm circuit comprises a power supply module, a first output end of the power supply module is connected with a power supply input end of an indicator lamp circuit module, a second output end of the power supply module is connected with a power supply input end of the alarm circuit module, a third output end, a fourth output end, a fifth output end and a sixth output end of the power supply module are respectively connected with a first signal input end, a second signal input end, a third signal input end and a fourth signal input end of a voltage division driving circuit module in a one-to-one correspondence manner, and a first driving signal output end and a second driving signal output end of the voltage division driving circuit module are respectively connected with a first signal input end and a second signal input end of the alarm circuit module;

the power module comprises a battery pack E and a switch K, the indicating lamp circuit module comprises a first light emitting diode LED1, the anode of the first light emitting diode LED1 is connected with the anode of the battery pack E through the switch K, the cathode of the first light emitting diode LED1 is connected with the cathode of the battery pack E through a first resistor R1, and the cathode of the battery pack E is grounded;

2. The alarm circuit of claim 1, wherein: the battery pack E is direct current 5V.

3. The alarm circuit of claim 1, wherein the alarm circuit is configured to automatically sense the intensity of ambient light: the first light emitting diode LED1 is a green light emitting diode, the second light emitting diode LED2 is a blue light emitting diode, and the third light emitting diode LED3 is a red light emitting diode.

4. The alarm circuit of claim 1, wherein: the first photoresistor PR1 and the second photoresistor PR2 are both dark resistors, and the resistance values are both 1M omega.

5. The alarm circuit of claim 1, wherein: the first triode VT1, the second triode VT2, the third triode VT3 and the fourth triode VT4 are all NPN type triodes.

6. The alarm circuit of claim 1, wherein: the maximum resistance values of the second sliding resistor R2 and the fourth sliding resistor R4 are both 10K omega.