CN109673083B - Night disturbance-free control method and circuit and smoke alarm - Google Patents
Night disturbance-free control method and circuit and smoke alarm Download PDFInfo
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- CN109673083B CN109673083B CN201811607912.XA CN201811607912A CN109673083B CN 109673083 B CN109673083 B CN 109673083B CN 201811607912 A CN201811607912 A CN 201811607912A CN 109673083 B CN109673083 B CN 109673083B
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention is suitable for the technical field of smoke alarms, and provides a night disturbance-free control method, a circuit and a smoke alarm, wherein the method comprises the steps of detecting a voltage signal of ambient light where the smoke alarm is located; the voltage signal is read by the MCU at intervals; and the MCU controls whether the smoke alarm is switched to a night disturbance-free state or not according to the read change range of the voltage signal. Because the voltage signal of the environment light where the smoke alarm is located can reflect the light of the environment where the smoke alarm is located, whether the smoke alarm enters night can be determined according to the change range of the read voltage signal, and then whether the smoke alarm is switched to the non-disturbing state at night is determined, and when the smoke alarm is switched to the non-disturbing state at night, the frequent flicker of an LED lamp of the smoke alarm in the night time period is avoided, and the influence on the normal rest of people at night is avoided.
Description
Technical Field
The invention belongs to the technical field of smoke alarms, and particularly relates to a night disturbance-free control method and circuit and a smoke alarm.
Background
In the modern society, as people's awareness of fire fighting is continuously improved, smoke alarms (also called fire smoke alarms, smoke sensors, etc.) are installed in more and more public places and individual residences. The smoke alarm has practical significance for preventing family fire and reducing fire loss. However, the smoke alarm in the prior art generally has a disadvantage that the LED lamp of the smoke alarm periodically flashes, or when the smoke alarm fails, the smoke alarm immediately gives a failure warning, and when people are in a rest state at night, the LED lamp periodically flashes and the failure warning affect normal rest of people.
Therefore, a technical scheme for solving the technical defects and avoiding disturbance of the smoke alarm at night is needed.
Disclosure of Invention
The embodiment of the invention provides a night disturbance-free control method for a smoke alarm, and aims to solve the problem that the smoke alarm does not influence the rest of people at night.
The embodiment of the invention is realized in such a way that a night disturbance-free control method for a smoke alarm comprises the following steps:
detecting a voltage signal of ambient light where the smoke alarm is located;
the voltage signal is read by the MCU at intervals;
and the MCU controls whether the smoke alarm is switched to a night disturbance-free state or not according to the read change range of the voltage signal.
Furthermore, the MCU controls whether the smoke alarm switches to the no-disturbance-at-night state according to the read variation range of the voltage signal, and the method specifically includes:
judging whether the change range of the read voltage signal changes from a set daytime voltage range to a set nighttime voltage range, if so, shortening the interval and continuing to read the voltage signal;
and judging whether the voltage signals read continuously for multiple times after the interval is shortened are all in a set night voltage range, if so, controlling the smoke alarm to be switched to a night disturbance-free state by the MCU.
Still further, after the MCU controls the smoke alarm to switch to the do-not-disturb night state, the method further comprises:
MCU judges whether the time that the smoke alarm is in the non-disturbing state at night exceeds the set night duration:
and if yes, the MCU controls the smoke alarm to exit the non-disturbing state at night.
Still further, the MCU controls the smoke alarm to switch to a night do not disturb state, including:
and the MCU controls the LED lamp of the smoke alarm to reduce the lighting time and the lighting frequency or directly turns off the LED lamp of the smoke alarm.
Still further, after the MCU controls the smoke alarm to switch to the do-not-disturb night state, the method further comprises:
and when the smoke alarm in the non-disturbing state at night breaks down, the MCU controls the smoke alarm to stop fault warning.
Furthermore, the MCU reads the voltage signal at intervals, specifically, once every fixed period.
Further, the fixed periods are distributed at equal intervals or at unequal intervals.
The embodiment of the invention also provides a night disturbance-free control circuit for the smoke alarm, which is used for realizing the night disturbance-free control method for the smoke alarm, and the circuit comprises:
the photosensitive device is controlled by the MCU and is used for detecting the ambient light of the smoke alarm;
a voltage dividing resistor connected with the photosensitive device;
and the MCU is connected to a connecting wire between the photosensitive device and the divider resistor and is used for reading the voltage signal at intervals and controlling whether the smoke alarm is switched to a night disturbance-free state or not according to the read change range of the voltage signal.
Furthermore, whether the smoke alarm is switched to the no-disturbance-at-night state is controlled according to the read change range of the voltage signal, specifically:
judging whether the change range of the read voltage signal changes from a set daytime voltage range to a set nighttime voltage range, if so, shortening the interval and continuing to read the voltage signal;
judging whether the voltage signals read continuously and repeatedly after the interval is shortened are all in a set night voltage range, if so, controlling the smoke alarm to be switched to a night disturbance-free state by the MCU;
judging whether the time of the smoke alarm in the non-disturbing state at night exceeds the set night time: if yes, the MCU controls the smoke alarm to exit the non-disturbing state at night;
judging whether the variation range of the voltage signal read by the MCU is continuously in a set night voltage range: and if so, the MCU controls the smoke alarm not to be switched to the non-disturbing state at night.
The embodiment of the invention also provides a smoke alarm which comprises the night disturbance-free control circuit for the smoke alarm.
In the night disturbance-free control method for the smoke alarm provided by the embodiment of the invention, the voltage signal of the ambient light of the smoke alarm can reflect the light of the environment of the smoke alarm, so that whether the smoke alarm enters the night can be determined according to the read change range of the voltage signal, and whether the smoke alarm is switched to the night disturbance-free state is further determined, and when the smoke alarm is switched to the night disturbance-free state, the phenomenon that the LED lamp of the smoke alarm frequently flickers in the night time period to influence the normal rest of people at night is avoided. In order to avoid the situation that the alarm is installed in a dark room and cannot work normally due to long-term night state, the step of judging whether the time in the night disturbance-free state exceeds the set night time length is added, the night disturbance-free state is forcibly quitted if the time in the night disturbance-free state exceeds the set night time length, whether the change range of the voltage signal is continuously in the set night voltage range is judged, if yes, the state is not switched to the night disturbance-free state, and the state is not switched to the night disturbance-free state again until the change range of the detected voltage signal is changed from the set daytime voltage range to the set night voltage range.
Drawings
Fig. 1 is a flowchart of a night disturbance-free control method for a smoke alarm according to an embodiment of the present invention;
fig. 2 is a flowchart of a night disturbance-free control method for a smoke alarm according to a second embodiment of the present invention;
fig. 3 is a flowchart of a nighttime disturbance-free control method for a smoke alarm according to a third embodiment of the present invention;
fig. 4 is a flowchart of a night disturbance-free control method for a smoke alarm according to a fifth embodiment of the present invention;
fig. 5(a) -5 (e) are different implementations of the night do-not-disturb control circuit for a smoke alarm according to an eighth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The embodiment of the invention provides a night disturbance-free control method for a smoke alarm, which comprises the following steps: detecting a voltage signal of the ambient light where the smoke alarm is located; the MCU reads voltage signals at intervals; and the MCU controls whether the smoke alarm is switched to a non-disturbing state at night according to the read change range of the voltage signal. The voltage signal of the smoke alarm is located environment light can reflect the light of the smoke alarm, whether the smoke alarm is switched to the night disturbance-free state or not is determined according to the change range of the read voltage signal, and when the smoke alarm is switched to the night disturbance-free state, the LED lamp of the smoke alarm is prevented from frequently flickering in the night time period, so that the night normal rest of people is prevented from being influenced.
Example one
An embodiment of the present invention provides a night disturbance-free control method for a smoke alarm, as shown in fig. 1, the method includes:
step 100, detecting a voltage signal of ambient light where the smoke alarm is located;
step 200, reading voltage signals at intervals by the MCU;
and step 300, controlling whether the smoke alarm is switched to a night disturbance-free state or not by the MCU according to the read change range of the voltage signal.
The principle of the method is as follows: detecting a voltage signal of the ambient light where the smoke alarm is located; the MCU reads voltage signals at intervals; and the MCU controls whether the smoke alarm is switched to a non-disturbing state at night according to the read change range of the voltage signal.
In this embodiment, because the voltage signal of the environment light that smoke alarm locates can reflect the light of smoke alarm locates environment, consequently according to the change range of the voltage signal who reads, can confirm whether get into night, and then confirm whether switch smoke alarm to the disturbance-free state at night, when smoke alarm switches to the disturbance-free state at night, avoided the LED lamp of smoke alarm frequently twinkling at night time quantum, influence people's normal rest at night.
Example two
The embodiment of the invention provides a night disturbance-free control method for a smoke alarm, and on the basis of the first embodiment, as shown in fig. 2, the step 300 specifically comprises the following steps:
step 301, judging whether the variation range of the read voltage signal is changed from a set daytime voltage range to a set nighttime voltage range, if so, executing step 302;
step 303, judging whether the voltage signals continuously read for multiple times after the interval is shortened are all in a set night voltage range, if so, executing step 304;
and step 304, the MCU controls the smoke alarm to be switched to a non-disturbing state at night.
In this embodiment, if the variation range of the read voltage signal varies from the set daytime voltage range to the set nighttime voltage range, and at this time, the time may have entered into nighttime from daytime, in order to avoid misjudgment, it is necessary to shorten the interval to continue reading the voltage signal (for example, originally, reading every 30 minutes, and shortening to reading every 5 minutes), and if the voltage signals read continuously for multiple times (for example, continuously for 5 times) after shortening the interval are all in the set nighttime voltage range, it is determined that the smoke alarm actually enters nighttime, so the MCU controls the smoke alarm to switch to the nighttime disturbance-free state. In consideration of the difference between the daytime and nighttime periods in each country and region, the daytime voltage range and the nighttime voltage range are set according to actual conditions.
In this embodiment, after step 304, the MCU controls the smoke alarm to switch to the no-disturbance state at night, the following steps are performed:
judging whether the change range of the read voltage signal changes from a set night voltage range to a set day voltage range or not, if so, shortening the interval and continuously reading the voltage signal;
and judging whether the voltage signals read continuously for multiple times after the interval is shortened are all in the set daytime voltage range, and if so, controlling the smoke alarm to be switched to the working state by the MCU.
Because the MCU controls the smoke alarm to switch to the no-disturbance-at-night state when the smoke alarm changes from daytime to nighttime, and the MCU controls the smoke alarm to switch to the working state when the smoke alarm changes from nighttime to daytime, the method is the same, and only the difference in the variation range of the read voltage signal is determined.
EXAMPLE III
An embodiment of the present invention provides a method for controlling a smoke alarm without disturbing at night, where on the basis of the second embodiment, as shown in fig. 3, after step 304, the method further includes:
and 308, controlling the smoke alarm to be not switched to the non-disturbing state at night by the MCU.
In this embodiment, in order to avoid that the alarm is installed in a dark room and cannot normally work due to long-term non-disturbance at night, timeout processing is added, if it is detected that the time exceeds a set night time (for example, 12 hours), at this time, it may be that the installation environment light of the smoke alarm is dim or there is no light, so that the change range of the read voltage signal is always within a set night voltage range, in order to avoid that the smoke alarm cannot normally prompt for a long time under such a condition, the smoke alarm is forcibly quitted from the non-disturbance at night, and is restored to a normal prompt state, that is, the LED lamp periodically flashes, or when the smoke alarm fails, the smoke alarm immediately sends a failure warning; and under the condition that the change range of the voltage signal is always detected to be in the set night voltage range, the night disturbance-free state is not entered. The night-time non-disturbing state cannot be entered again until the day-to-night transition is detected.
Example four
The embodiment of the invention provides a night disturbance-free control method for a smoke alarm, and on the basis of the second embodiment, step 306 specifically comprises the following steps:
the MCU controls the LED lamp of the smoke alarm to reduce the lighting time and lighting frequency or directly turns off the LED lamp of the smoke alarm.
In this embodiment, when MCU control smoke alarm switched to the state of not disturbing at night, the LED lamp through control smoke alarm reduced the LED lamp of lighting time, lighting frequency or directly closed smoke alarm, avoided when people were in the rest state at night, the LED lamp frequently twinkles and can influence people's normal rest.
EXAMPLE five
An embodiment of the present invention provides a method for controlling a smoke alarm without disturbing at night, as shown in fig. 4, where on the basis of the second embodiment, after the MCU controls the smoke alarm to switch to a state of avoiding disturbing at night, the method further includes:
step 309, if the smoke alarm in the non-disturbing state at night breaks down, the MCU controls the smoke alarm to stop the failure warning.
In this embodiment, through MCU control smoke alarm stops the trouble warning when smoke alarm breaks down under the night condition, avoid when people are in the rest state at night, the reputation suggestion of trouble warning can influence people's normal rest.
EXAMPLE six
The embodiment of the invention provides a night disturbance-free control method for a smoke alarm.
In this embodiment, the voltage signal of the ambient light to which the smoke alarm is located is read once every fixed period, for example, once every 30 minutes, so that the ambient light to which the smoke alarm is located is monitored.
EXAMPLE seven
The embodiment of the invention provides a night disturbance-free control method for a smoke alarm, wherein on the basis of the sixth embodiment, fixed periods are distributed at equal intervals or unequal intervals.
In this embodiment, the voltage signal of the ambient light where the smoke alarm is located is read once every fixed period that is distributed at equal intervals or unequal intervals, so that the ambient light where the smoke alarm is located can be monitored, the fixed period may be distributed at equal intervals or unequal intervals, whether the voltage signal is adjusted or not can be determined according to actual conditions, and the voltage signal is not specifically limited here.
Example eight
The embodiment of the invention provides a night disturbance-free control circuit for a smoke alarm, which is used for realizing the night disturbance-free control method for the smoke alarm of any one of the embodiments, and the circuit comprises the following components:
the photosensitive device is controlled by the MCU and is used for detecting the ambient light of the smoke alarm;
a voltage dividing resistor connected with the photosensitive device;
and the MCU is connected to a connecting wire between the photosensitive device and the divider resistor and is used for reading voltage signals at intervals and controlling whether the smoke alarm is switched to a night disturbance-free state or not according to the change range of the read voltage signals.
The working principle of the night disturbance-free control circuit is as follows:
the MCU controls the photosensitive device to detect the ambient light of the smoke alarm, the MCU reads the voltage signal of the ambient light of the smoke alarm at intervals, if the read voltage signal changes from the set daytime voltage range to the set night voltage range, the time is indicated to possibly enter the night from the daytime, at the moment, in order to determine whether the smoke alarm really enters the night instead of accidentally changing the voltage signal due to other reasons, the interval needs to be shortened to continuously read the voltage signal for further determination, if the voltage signal which is continuously read for multiple times after the interval is shortened is in the set night voltage range, the smoke alarm is indicated to really enter the night, and at the moment, the MCU controls the smoke alarm to be switched to a night interference-free state. If the read voltage signal is always in the set night voltage range, the smoke alarm may be installed in a dim environment, if the night duration is detected to exceed a set time (for example, 12 hours), the smoke alarm is forcibly exited from the night disturbance-free state, and if the smoke alarm is detected to be always in the night, the smoke alarm does not enter the night disturbance-free state. The non-disturbing state at night can be entered again only after the change from day to night is detected.
The above-mentioned night do not disturb control circuit can also include: and the filter capacitors are connected in parallel at two ends of the voltage dividing resistor. The voltage division is realized through the divider resistance under the condition that the total voltage is not changed, and the signal anti-interference is realized through the filter capacitor.
In the embodiment, when in the daytime or in the presence of lamplight, the light is strong, so that the impedance of the photosensitive device becomes small, the current becomes large, and the voltage value is high; at night or when the lamp is turned off, the light is weak, so that the impedance of the photosensitive device is increased, the current is reduced, and the voltage value is low. The MCU reads the voltage value at intervals, so that the monitoring of the ambient light where the smoke alarm is located is realized, whether the smoke alarm is switched to a night disturbance-free state or not is controlled according to the change range of the read voltage signal, the automatic switching of the working state of the smoke alarm is realized, and the influence of the smoke alarm on the rest of people at night is avoided. The photosensitive device can adopt a photosensitive diode, a photosensitive resistor or a photosensitive module, and the MCU can adopt a module purchased in the market or directly use the MCU of the smoke alarm, but is not limited to the above; the specific structures and circuits of the smoke alarm, the MCU and the photosensitive device are not innovative points of the application, and therefore the structures and circuits of the smoke alarm, the MCU and the photosensitive device are not limited and repeated.
The above-mentioned circuit may be implemented as any one of the circuits in fig. 5(a) to 5(e), but this is merely an example, and the implementation of the night-time do not disturb control circuit is not limited to this.
Taking fig. 5(a) as an example to illustrate the night disturbance-free control circuit, the negative electrode of the photosensitive device is connected to the power source VCC, the positive electrode is connected to one end of the voltage dividing resistor, and the other end of the voltage dividing resistor is grounded; one pin of the MCU is connected to a connecting wire between the photosensitive device and the divider resistor and is used for reading voltage signals at intervals.
Taking fig. 5(b) as an example to illustrate the night-time disturbance-free control circuit, the negative electrode of the photosensitive device is connected to the collector of the switching device, the emitter of the switching device is connected to the power VCC, the positive electrode is connected to one end of the voltage dividing resistor, and the other end of the voltage dividing resistor is grounded; one pin of the MCU is connected to a connecting wire between the photosensitive device and the divider resistor and is used for reading voltage signals at intervals; the other pin of the MCU is connected to the base of a switching device, and the MCU drives the photosensitive device through the switching device. The switching device may be a transistor 8550, but is not limited thereto.
Fig. 5(c) is an example of the night disturbance-free control circuit, in which the negative electrode of the photosensitive device is connected to the power source VCC, and the positive electrode is connected to one end of the voltage dividing resistor; one pin of the MCU is connected to a connecting wire between the photosensitive device and the divider resistor and used for reading voltage signals at intervals, and the other pin of the MCU is connected with the other end of the divider resistor.
Fig. 5(d) is an example of the night disturbance-free control circuit, in which the negative electrode of the photosensitive device is connected to the power source VCC, and the positive electrode is connected to one end of the voltage dividing resistor; one pin of the MCU is connected to a connecting wire between the photosensitive device and the divider resistor and is used for reading voltage signals at intervals; the other end of the divider resistor is connected with a collector of the switch device, the other pin of the MCU is connected with a base of the switch device, an emitter of the switch device is grounded, and the MCU drives the switch device. The switching device may be a transistor 8050, but is not limited thereto.
Taking fig. 5(e) as an example to illustrate the night disturbance-free control circuit, the positive electrode of the photosensitive device is grounded, the negative electrode is connected to one end of a voltage dividing resistor, the other end of the voltage dividing resistor is connected to a power supply VCC, and one pin of the positive electrode MCU is connected to a connection line between the photosensitive device and the voltage dividing resistor for reading voltage signals at intervals.
Example nine
The embodiment of the invention provides a night disturbance-free control circuit for a smoke alarm, which is used for controlling whether the smoke alarm is switched to a night disturbance-free state or not according to the read change range of a voltage signal on the basis of the eighth embodiment, and specifically comprises the following steps:
judging whether the change range of the read voltage signal changes from a set daytime voltage range to a set nighttime voltage range, if so, shortening the interval and continuing to read the voltage signal;
judging whether the voltage signals continuously read for multiple times after the interval is shortened are all in a set night voltage range, if so, controlling the smoke alarm to be switched to a night disturbance-free state by the MCU;
judging whether the time of the smoke alarm in the non-disturbing state at night exceeds the set night time: if so, the MCU controls the smoke alarm to exit the non-disturbing state at night;
judging whether the variation range of the voltage signal read by the MCU is continuously in the set night voltage range: and if so, the MCU controls the smoke alarm to be not switched to the non-disturbing state at night.
In this embodiment, when the variation range of the read voltage signal varies from the set daytime voltage range to the set nighttime voltage range, the time may have already entered the nighttime from the daytime, and to avoid misjudgment, it is necessary to shorten the interval to continue reading the voltage signal for further confirmation, and if the voltage signals read continuously after shortening the interval are all in the set nighttime voltage range, it is determined that the voltage signal actually enters the nighttime, so the MCU controls the smoke alarm to switch to the no-disturbance state at night. If the read voltage signal is always in the set night voltage range, the smoke alarm may be installed in a dim environment, if the duration of the night exceeds a set time (for example, 12 hours), the smoke alarm is forcibly exited from the night disturbance-free state, and if the smoke alarm is detected to be always in the night, the smoke alarm does not enter the night disturbance-free state. The non-disturbing state at night can be entered again only after the change from day to night is detected. Since the daytime and nighttime periods of each country and region are different, the daytime voltage range and the nighttime voltage range are set according to actual conditions.
Example ten
The embodiment of the invention provides a smoke alarm, which comprises an eighth night disturbance-free control circuit for the smoke alarm.
In this embodiment, through increase the disturbance-free control circuit at night on smoke alarm, realize carrying out the disturbance-free control under the night state to smoke alarm, this smoke alarm has avoided because the frequent scintillation of LED lamp, influences the normal rest at people night.
According to the night disturbance-free control method for the smoke alarm, the voltage signal of the light of the environment where the smoke alarm is located can reflect the light of the environment where the smoke alarm is located, whether the smoke alarm is switched to the night disturbance-free state or not is determined according to the read change range of the voltage signal, and when the smoke alarm is switched to the night disturbance-free state, the phenomenon that an LED lamp of the smoke alarm frequently flickers in the night time period to affect normal rest of people at night is avoided. Specifically, if the variation range of the read voltage signal varies from the set daytime voltage range to the set nighttime voltage range, in order to avoid misjudgment, the voltage signals continuously read for multiple times after the interval is shortened are all in the set nighttime voltage range, and the MCU controls the smoke alarm to switch to the no-disturbance-at-night state. And meanwhile, if the time of the smoke alarm in the non-disturbance state at night exceeds the set night time, the smoke alarm is forced to exit from the non-disturbance state at night and is restored to the normal prompt state. When MCU control smoke alarm switches to the state of exempting from to disturb at night, specifically reduce the LED lamp of lighting time, lighting frequency or directly close smoke alarm through the LED lamp of control smoke alarm, avoided when people are in the rest state at night, the LED lamp frequently twinkles and can influence people's normal rest. In addition, the MCU controls the smoke alarm to stop fault warning when the smoke alarm breaks down under the night condition, so that the phenomenon that normal rest of people is influenced by sound and light prompt of the fault warning when people are in a rest state at night is avoided. The voltage signal of the ambient light of the smoke alarm is read once every fixed period, so that the ambient light of the smoke alarm is monitored, and the fixed period can be determined to be distributed at equal intervals or unequal intervals according to actual conditions. In the night disturbance-free control circuit for the smoke alarm provided by the embodiment of the invention, the MCU reads the voltage value at intervals, so that the monitoring of the ambient light where the smoke alarm is positioned is realized, whether the smoke alarm is switched to a night disturbance-free state or not is controlled according to the read change range of the voltage signal, the automatic switching of the working state of the smoke alarm is realized, and the smoke alarm is prevented from influencing the rest of people at night. Through increase the disturbance-free control circuit at night on smoke alarm, realize carrying out the disturbance-free control under the night state to smoke alarm, this smoke alarm has avoided because the frequent scintillation of LED lamp, influences the normal rest at night of people.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (7)
1. A method of night-time, non-disturbing control for a smoke alarm, the method comprising:
detecting a voltage signal of ambient light where the smoke alarm is located;
the voltage signal is read by the MCU at intervals;
the MCU controls whether the smoke alarm is switched to a non-disturbing state at night or not according to the read change range of the voltage signal;
the MCU is according to read voltage signal's variation range, control whether smoke alarm switches to the state of not disturbing night, specifically includes:
judging whether the change range of the read voltage signal changes from a set daytime voltage range to a set nighttime voltage range, if so, shortening the interval and continuing to read the voltage signal;
judging whether the voltage signals read continuously and repeatedly after the interval is shortened are all in a set night voltage range, if so, controlling the smoke alarm to be switched to a night disturbance-free state by the MCU;
judging whether the time of the smoke alarm in the non-disturbing state at night exceeds the set night time length or not; if so, the MCU controls the smoke alarm to exit the non-disturbing state at night;
judging whether the variation range of the voltage signal read by the MCU is continuously in the set night voltage range or not; if so, the MCU controls the smoke alarm to be not switched to the non-disturbing state at night.
2. The night disturbance-free control method for a smoke alarm according to claim 1, wherein the MCU controls the smoke alarm to switch to a night disturbance-free state, comprising:
and the MCU controls the LED lamp of the smoke alarm to reduce the lighting time and the lighting frequency or directly turns off the LED lamp of the smoke alarm.
3. The night disturbance-free control method for a smoke alarm according to claim 1, wherein after the MCU controls the smoke alarm to switch to a night disturbance-free state, the method further comprises:
and when the smoke alarm in the non-disturbing state at night breaks down, the MCU controls the smoke alarm to stop fault warning.
4. The night disturbance-free control method for a smoke alarm according to claim 1, wherein the MCU reads the voltage signal at intervals, in particular once every fixed period.
5. The night disturbance-free control method for a smoke alarm according to claim 4, wherein the fixed periods are equally or unequally spaced apart.
6. A night-time do-not-disturb control circuit for a smoke alarm for implementing the method of any of claims 1 to 5 for night-time do-not-disturb control of a smoke alarm, the circuit comprising:
the photosensitive device is controlled by the MCU and is used for detecting the ambient light of the smoke alarm;
a voltage dividing resistor connected with the photosensitive device;
the MCU is connected to a connecting wire between the photosensitive device and the divider resistor and is used for reading the voltage signal at intervals and controlling whether the smoke alarm is switched to a night disturbance-free state or not according to the read change range of the voltage signal;
according to the change range of the read voltage signal, whether the smoke alarm is switched to the non-disturbing state at night is controlled, and the method specifically comprises the following steps:
judging whether the change range of the read voltage signal changes from a set daytime voltage range to a set nighttime voltage range, if so, shortening the interval and continuing to read the voltage signal;
judging whether the voltage signals continuously read for multiple times after the interval is shortened are all in a set night voltage range, if so, controlling the smoke alarm to be switched to a night disturbance-free state by the MCU;
judging whether the time of the smoke alarm in the non-disturbing state at night exceeds the set night time length or not; if so, the MCU controls the smoke alarm to exit the non-disturbing state at night;
judging whether the variation range of the voltage signal read by the MCU is continuously in the set night voltage range or not; and if so, the MCU controls the smoke alarm to be not switched to the non-disturbing state at night.
7. A smoke alarm including a night time do not disturb control circuit for a smoke alarm as claimed in claim 6.
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| CN201811607912.XA CN109673083B (en) | 2018-12-27 | 2018-12-27 | Night disturbance-free control method and circuit and smoke alarm |
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| CN103079310A (en) * | 2012-12-26 | 2013-05-01 | 浙江明烁电子科技有限公司 | Dimming control circuit for spotlight |
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| CN109673083A (en) | 2019-04-23 |
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