CN111696289B - PIR sensor signal triggering method and device - Google Patents
PIR sensor signal triggering method and device Download PDFInfo
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- G—PHYSICS
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- G08B13/00—Burglar, theft or intruder alarms
- G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
- G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
- G08B13/19—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems
- G08B13/191—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems using pyroelectric sensor means
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/18—Prevention or correction of operating errors
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
- G08B29/18—Prevention or correction of operating errors
- G08B29/185—Signal analysis techniques for reducing or preventing false alarms or for enhancing the reliability of the system
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Abstract
The invention discloses a PIR sensor signal triggering method and a device, comprising the following steps: setting a first voltage threshold and a second voltage threshold; and generating a trigger signal when the times that the monitoring signal generated by the PIR sensor alternately reaches the first voltage threshold and the second voltage threshold reach a set time within a preset time range from the time when the monitoring signal generated by the PIR sensor reaches the first voltage threshold to start timing. The first voltage threshold and the second voltage threshold are voltage thresholds at which a waveform generated by a human body to the PIR sensor can reach a set number of times within a preset time range and a waveform generated by other heat sources except the human body to the PIR sensor cannot reach the set number of times within the preset time range. The invention realizes accurate identification and signal triggering of human body waveform by utilizing the characteristics of different waveforms generated by heat sources such as human body and hot air on the PIR sensor.
Description
Technical Field
The invention relates to the technical field of security and protection, in particular to a PIR sensor signal triggering method and device.
Background
The operating principle of a PIR (Passive Infrared Ray, pyroelectric Infrared sensor) sensor is that human body thermal radiation is focused on a pyroelectric element through a lens, so that the pyroelectric element generates corresponding level change along with the change of thermal radiation quantity, and alarm in the installation environment of the PIR sensor can be realized through monitoring the level change. If a person enters a monitoring area of the PIR sensor, the level change of the PIR sensor is prompted, and then the alarm is triggered through the level change of the PIR sensor.
However, since the PIR sensor is an element for passively monitoring the level change of the generated thermal radiation, when a heat source similar to the thermal radiation of a human body is generated in the monitored area of the PIR sensor, an alarm is triggered by mistake, thereby limiting the application of the PIR sensor. If the wavelength of the heat radiation generated by non-human body heat sources such as hot air is close to that of a human body, the heat radiation can be collected by the PIR sensor and the level close to or higher than that of the human body is output, so that when hot air blows through the PIR sensor, the PIR sensor triggers to alarm. Therefore, PIR sensors are hardly applicable in outdoor environments.
Disclosure of Invention
In view of this, the present invention provides a method and an apparatus for triggering a PIR sensor signal, so as to generate an accurate human body monitoring signal triggering signal based on a monitoring signal of the PIR sensor, thereby avoiding false signal triggering caused by interference such as hot wind.
The technical scheme of the invention is realized as follows:
a PIR sensor signal triggering method comprises the following steps:
setting a first voltage threshold and a second voltage threshold;
and generating a trigger signal when the number of times that the monitoring signal generated by the PIR sensor alternately reaches the first voltage threshold and the second voltage threshold reaches a set number of times within a preset time range when the timing is started when the monitoring signal generated by the PIR sensor reaches the first voltage threshold.
Further, the PIR sensor is a bipolar PIR sensor.
Further, the monitoring signal generated by the PIR sensor is generated by the PIR sensor and amplified by an operational amplifier circuit electrically connected to the PIR sensor.
Further, the first voltage threshold is greater than the second voltage threshold; or alternatively
The first voltage threshold is less than the second voltage threshold.
Further, the preset time range is 2 to 6 seconds.
Further, the set number of times is 2 to 4 times.
Further, the monitoring signal generated by the PIR sensor alternately reaches the first voltage threshold and the second voltage threshold, specifically:
at the timing of starting timing, recording as 1 st time when the monitoring signal generated by the PIR sensor reaches the first voltage threshold;
after the 1 st time, recording as 2 nd time that the monitoring signal generated by the PIR sensor reaches the second voltage threshold;
after the 2 nd time, recording as 3 rd time that the monitoring signal generated by the PIR sensor reaches the first voltage threshold;
and so on.
A PIR sensor signal trigger apparatus, comprising:
a setting module for setting a first voltage threshold and a second voltage threshold;
the recording module is used for recording the times that the monitoring signal generated by the PIR sensor alternately reaches the first voltage threshold and the second voltage threshold within a preset time range when the monitoring signal generated by the PIR sensor starts timing at the moment of reaching the first voltage threshold; and
the signal triggering module is used for generating a triggering signal when the number of times that the monitoring signal generated by the PIR sensor recorded by the recording module alternately reaches the first voltage threshold and the second voltage threshold reaches a set number of times.
An electronic device, comprising:
at least one processor; and the number of the first and second groups,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to cause the at least one processor to perform steps in a PIR sensor signal triggering method as described in any above.
A non-transitory computer readable storage medium storing instructions that, when executed by a processor, cause the processor to perform the steps in a PIR sensor signal triggering method as described in any above.
According to the scheme, the PIR sensor signal triggering method and the device utilize the characteristic that the waveforms generated by the PIR sensor are different due to the fact that the shapes of heat sources such as a human body and hot air are different, and based on the waveforms generated by the human body to the PIR sensor, the triggering signal is generated when the frequency that the monitoring signal generated by the PIR sensor alternately reaches the first voltage threshold and the second voltage threshold reaches the set frequency within the preset time range starting to time when the monitoring signal generated by the PIR sensor reaches the first voltage threshold through setting the first voltage threshold and the second voltage threshold, so that the accurate identification and signal triggering of the human body waveform are achieved. The waveform generated by the human body to the PIR sensor can alternately reach the first voltage threshold and the second voltage threshold within the preset time range, and the heat sources such as hot air and the like can not alternately reach the first voltage threshold and the second voltage threshold within the preset time range. The PIR sensor signal triggering method and the device can be applied to the existing bipolar PIR sensor equipment, do not need to modify the existing bipolar PIR sensor equipment, only need to access the device for realizing the PIR sensor signal triggering method and the device function of the embodiment of the invention at the signal output end of the existing bipolar PIR sensor equipment, have high compatibility with the existing bipolar PIR sensor equipment, do not need to modify the existing bipolar PIR sensor equipment, and save the investment for modifying the existing bipolar PIR sensor equipment.
Drawings
FIG. 1 is a flow chart of a PIR sensor signal triggering method according to an embodiment of the present invention;
FIG. 2 is a block diagram of a PIR sensor signal triggering device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a conventional bipolar PIR sensor apparatus;
FIG. 4 is a schematic diagram of a waveform change generated by hot air on a conventional bipolar PIR sensor apparatus;
FIG. 5 is a schematic diagram of a change in waveform generated by a human body to a conventional bipolar PIR sensor apparatus;
FIG. 6 is a relationship between a voltage offset value, a first voltage threshold and a second voltage threshold set in the embodiment of the present invention;
FIG. 7 is a schematic diagram illustrating recording of a point X1 when a disturbance waveform reaches a first voltage threshold according to an embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating recording of X2 points when the interference waveform reaches the second voltage threshold in an embodiment of the present invention;
FIG. 9 is a diagram illustrating recording X3 points when the interference waveform again reaches the first voltage threshold in an embodiment of the present invention;
FIG. 10 is a schematic diagram of recording X4 points when the interference waveform reaches the second voltage threshold again in the embodiment of the present invention;
FIG. 11 is a logic flow diagram illustrating a case where the set number n is 3 according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of an electronic device in an 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 examples.
As shown in fig. 1, a method for triggering a PIR sensor signal according to an embodiment of the present invention includes:
step 1, setting a first voltage threshold and a second voltage threshold;
and 2, generating a trigger signal when the frequency of the monitoring signal generated by the PIR sensor alternately reaching the first voltage threshold and the second voltage threshold reaches a set frequency within a preset time range when the timing is started at the moment when the monitoring signal generated by the PIR sensor reaches the first voltage threshold.
Wherein, the setting of the first voltage threshold and the second voltage threshold ensures: the frequency that the waveform generated by the PIR sensor by the human body alternately reaches the first voltage threshold and the second voltage threshold within the preset time range can reach the set frequency; the waveform generated by the PIR sensor by other heat sources (such as hot air and the like) except the human body can not alternately reach the first voltage threshold and the second voltage threshold within a preset time range, and/or the frequency of the waveform generated by the PIR sensor by other heat sources (such as hot air and the like) except the human body alternately reaching the first voltage threshold and the second voltage threshold can not reach the set frequency. By setting the voltage threshold, the waveform of the human body is identified.
In alternative embodiments, the trigger signal may be sent to multiple devices to trigger operation of the respective devices. For example, a trigger signal may be sent to the alarm device to trigger an alarm of the alarm device, and a trigger signal may also be sent to the lamp control device to trigger the lighting of the electric lamp.
In an alternative embodiment, the PIR sensor is a bipolar PIR sensor.
In an alternative embodiment, the monitoring signal generated by the PIR sensor is generated by the PIR sensor and amplified by an operational amplifier circuit electrically connected to the PIR sensor.
In an alternative embodiment, the first voltage threshold is greater than the second voltage threshold; alternatively, the first voltage threshold is less than the second voltage threshold.
In an alternative embodiment, the predetermined time is in the range of 2 to 6 seconds.
In an alternative embodiment, the set number of times is 2 to 4 times.
In an optional implementation, the monitoring signal generated by the PIR sensor in step 2 alternately reaches the first voltage threshold and the second voltage threshold, specifically:
at the timing of starting timing, recording that a monitoring signal generated by a PIR sensor reaches a first voltage threshold as the 1 st time;
after the 1 st time, recording the time that the monitoring signal generated by the PIR sensor reaches a second voltage threshold as the 2 nd time;
after the 2 nd time, recording the time when the monitoring signal generated by the PIR sensor reaches a first voltage threshold value as the 3 rd time;
and so on.
The embodiment of the invention also provides a signal triggering device for the PIR sensor, which comprises a setting module 11, a recording module 12 and a signal triggering module 13, as shown in FIG. 2. The setting module 11 is configured to set a first voltage threshold and a second voltage threshold. The recording module 12 is configured to record the number of times that the monitoring signal generated by the PIR sensor alternately reaches the first voltage threshold and the second voltage threshold within a preset time range in which timing is started when the monitoring signal generated by the PIR sensor reaches the first voltage threshold. The signal triggering module 13 is configured to generate a triggering signal when the number of times that the monitoring signal generated by the PIR sensor recorded by the recording module 12 alternately reaches the first voltage threshold and the second voltage threshold reaches a set number of times.
The PIR sensor alarm method and the device of the embodiment of the invention are suitable for the existing bipolar PIR sensor equipment. Figure 3 shows a schematic of the structure of a prior art bipolar PIR sensor device. The bipolar PIR sensor device comprises an optical component 21, a pyroelectric element 22, a MOS transistor 23 and an operational amplifier 24. The optical assembly 21 includes a lens 211 and a filter 212, wherein the filter 212 is, for example, a fresnel filter array, and the fresnel filter array is equivalent to a plurality of lenses. The pyroelectric element 22 includes a first pyroelectric element 221 and a second pyroelectric element 222, and the same polarity of the first pyroelectric element 221 and the second pyroelectric element 222 is connected, for example, as shown in fig. 3, the positive electrode of the first pyroelectric element 221 is connected to the positive electrode of the second pyroelectric element 222. The gate G of the MOS transistor 23 is connected to the cathode of one of the two pyroelectric elements, and the cathode of the other pyroelectric element is grounded, for example, as shown in fig. 3, the gate G of the MOS transistor 23 is connected to the cathode of the first pyroelectric element 221, and the cathode of the second pyroelectric element 222 is grounded GND. The source S of the MOS tube 23 is connected to the input end of the operational amplifier 24, and the drain D of the MOS tube 23 is connected to the power voltage. The output of the operational amplifier 24 outputs the monitoring signal of the PIR sensor.
The heat radiation emitted from the outside is focused on the first pyroelectric element 221 and the second pyroelectric element 222 through the optical component, and when the heat radiation energy received by the first pyroelectric element 221 and the second pyroelectric element 222 is the same, the energy is mutually offset, so that no electric signal is output, and the source S of the MOS tube 23 only outputs the voltage of the offset value. The electrical signal is output only when the first pyroelectric element 221 and the second pyroelectric element 222 receive different thermal radiation energies, when the radiation irradiated to the second pyroelectric element 222 is greater than that of the first pyroelectric element 221, the source S of the MOS tube 23 outputs a voltage higher than the bias value, and when the radiation irradiated to the second pyroelectric element 222 is smaller than that of the first pyroelectric element 221, the source S of the MOS tube 23 outputs a voltage lower than the bias value. When a human body passes through the bipolar PIR sensor device, when the heat radiation of the human body passes through one equivalent lens in the Fresnel filter array and is focused on the first pyroelectric element 221 and the second pyroelectric element 222, the MOS tube 23 outputs positive bias voltage, 0, negative bias voltage and 0, and when the human body passes through the next equivalent lens in the Fresnel filter array and is focused on the first pyroelectric element 221 and the second pyroelectric element 222, the output signal of the MOS tube 23 repeats the previous signal cycle and outputs the positive bias voltage, 0, negative bias voltage and 0. Since the voltage output by the source S of the MOS transistor 23 has a very low amplitude, and thus needs to be amplified by the operational amplifier 24 to be detected, in the embodiment of the present invention, the signal amplified by the operational amplifier 24 is defined as the monitoring signal generated by the PIR sensor.
In the existing bipolar PIR sensor equipment, once the oscillation amplitude of a monitoring signal is higher than a set threshold or lower than another set threshold, human body activity is judged, and a trigger signal is generated to perform operations such as alarming and the like.
In practical tests, the inventor finds that the waveform generated by hot wind in the external environment is different from the waveform generated by a human body in characteristics, for the hot wind, due to the large volume of the wind, the projected area generated after the hot wind passes through the lens is large, due to the fact that the first pyroelectric element 221 and the second pyroelectric element 222 are connected in series in a reverse direction, the energy incident at the same time can be mutually offset, only the initial voltage of the hot wind appears has a positive or negative change, and the subsequent signal group gradually approaches to the middle bias value, as shown in fig. 4.
For human body, the volume of human body is small, and in practical use, the optical filter 212 usually adopts a fresnel filter array (i.e. a plurality of fresnel lenses) or a lens array whose inner surface is made of small spherical lenses, so that the projection area generated by the human body after passing through the lens is small, and because the first pyroelectric element and the second pyroelectric element are connected in series in an opposite manner, when incident energy is sequentially irradiated on the first pyroelectric element and the second pyroelectric element, the generated voltage waveform can form a waveform that is alternately changed around a middle bias value, as shown in fig. 5. Therefore, the bipolar PIR sensor equipment can distinguish a human body in an outdoor environment by judging the waveform characteristics, and the false alarm of the PIR sensor equipment is reduced.
The embodiment of the invention is based on the difference of interference waveform characteristics formed by human bodies and hot air on the bipolar PIR sensor equipment, and particularly generates the trigger signal based on the characteristics of the interference waveform formed by the human bodies on the bipolar PIR sensor equipment.
1) The interference waveform signal formed by the PIR sensor device is an AC signal with bias, and the voltage bias value V of the signal is firstly determined0。
2) Determining a first voltage threshold V according to the actual detection range requirement1And a second voltage threshold V2As shown in fig. 5. Wherein the first voltage threshold value V1Above voltage bias value V0Second voltage threshold V2Below voltage offset value V0. In other embodiments, the first voltage threshold V1Can be lower than the voltage offset value V0And a second voltage threshold V2Can be higher than the voltage offset value V0。
3) When the interference waveform formed by the human body to the bipolar PIR sensor device reaches the first voltage threshold V1Or a second voltage threshold V2Then, the number of times of reaching the threshold value is recorded 1 time and the timer is started. For example, in the embodiment shown in FIG. 7, when the interference waveform formed by the human body to the bipolar PIR sensor device reaches the first voltage threshold V1(high threshold) time, record X1The time is counted and started.
4) Then, when the interference waveform formed by the human body to the bipolar PIR sensor device reaches a second voltage threshold V2Or a first voltage threshold V1Then, the number of times of reaching the threshold is recorded 1 more time, and at this time, the number of times of reaching the threshold has been recorded 2 more times. For example, in the embodiment shown in FIG. 8, when a human body is formed against a bipolar PIR sensor deviceThe interference waveform reaches the second voltage threshold V2(Low threshold) time, record X2And (4) point.
5) Then, when the interference waveform formed by the human body to the bipolar PIR sensor device reaches the first voltage threshold V again1Or a second voltage threshold V2Then, the number of times of reaching the threshold is recorded 1 more time, and at this time, the number of times of reaching the threshold has been recorded 3 more times. For example, in the embodiment shown in FIG. 9, when the interference waveform formed by the human body to the bipolar PIR sensor device reaches the first voltage threshold V again1(high threshold) time, record X3And (4) point.
6) Then, when the interference waveform formed by the human body to the bipolar PIR sensor equipment reaches the second voltage threshold value V again2Or a first voltage threshold V1Then, the number of times of reaching the threshold is recorded 1 more time, and at this time, the number of times of reaching the threshold has been recorded 4 more times. For example, in the embodiment shown in FIG. 10, when the interference waveform formed by the human body to the bipolar PIR sensor device reaches the second voltage threshold V again2(Low threshold) time, record X4And (4) point.
The number of subsequent threshold arrivals continues to be recorded in accordance with the procedure described above.
7) Starting timing from the first time of recording the number of times of reaching the threshold value, and if the recorded number of times of reaching the threshold value reaches (is more than or equal to) the set number of times n within the set time range T, generating a trigger signal to trigger the alarm device to alarm or trigger corresponding operations of other devices. E.g. for the processes of fig. 7 to 10, from X1Starting timing, if in time range T, detecting recording point (X)1、X2、X3……Xn) When the number of the alarm devices is larger than the set number n, a trigger signal is generated to trigger the alarm devices to alarm or trigger corresponding operations of other devices. Preferably, T is more than or equal to 2 seconds and less than or equal to 6 seconds, n is more than or equal to 2 and less than or equal to 4 seconds, and the set times of T and n can achieve the effect of eliminating most of interference of hot air and sunlight.
Fig. 11 shows a logic flow diagram when the set number n is 3 in the embodiment of the present invention, where the logic flow includes:
step a, starting sampling, and then entering step b or step b';
step b, judging whether the interference waveform reaches a first voltage threshold value, if so, entering the step c, otherwise, returning to the step a;
step c, recording X1Point, then enter step d;
step d, continuing sampling, and entering step e;
e, judging whether the interference waveform reaches a second voltage threshold, if so, entering a step f, otherwise, entering a step k;
step f, recording X2Point, then enter step g;
step g, continuing sampling, and entering step h;
step h, judging whether the interference waveform reaches a first voltage threshold value, if so, entering a step i, otherwise, entering a step l;
step i, record X3Point, then go to step j;
j, generating a trigger signal and starting the next cycle;
step k, judging whether the timing time reaches a set time range T, if so, finishing the cycle, otherwise, returning to the step d;
step l, judging whether the timing time reaches a set time range T, if so, finishing the cycle, otherwise, returning to the step g;
step b ', judging whether the interference waveform reaches a second voltage threshold value, if so, entering step c', otherwise, returning to the step a;
step c', record X1Point, then go to step d';
step d ', continuing sampling, and entering step e';
step e ', judging whether the interference waveform reaches a first voltage threshold value, if so, entering step f ', otherwise, entering step k ';
step f', record X2Point, then go to step g';
step g ', sampling is continued, and step h' is carried out;
step h ', judging whether the interference waveform reaches a second voltage threshold value, if so, entering a step i ', otherwise, entering a step l ';
step i', record X3Point, then go to step j';
step j', generating a trigger signal and starting the next cycle;
step k ', judging whether the timing time reaches a set time range T, if so, finishing the circulation, otherwise, returning to the step d';
and step l ', judging whether the timing time reaches a set time range T, if so, finishing the circulation, otherwise, returning to the step g'.
The PIR sensor signal triggering method and the device of the embodiment of the invention are adopted to carry out actual three groups of comparison tests; wherein, the group A sets T to be less than or equal to 5 seconds, and triggers alarm when n = 3; the group B sets T to be less than or equal to 5 seconds, and triggers an alarm when n = 2; group C sets the alarm to be triggered whenever X1 point is generated. The three groups of comparison test environments are outdoor sunny environment, the total test time is 3 days, the PIR sensor is arranged in outdoor open-air environment, a person passes through the test area within 3 days, and the number of the passed persons is recorded to be 60, so that the three groups of comparison tests are shown in the following table.
| Group A | Group B | Group C | |
| Number of alarms | 60 | 126 | 1822 |
| Number of false alarms | 0 | 66 | 1762 |
It can be seen that the optimal embodiment adopts the setting that T is less than or equal to 5 seconds, and the optimal effect of avoiding false alarm can be achieved by triggering alarm when n = 3.
An embodiment of the present invention further provides an electronic device for executing a PIR sensor signal triggering method, as shown in fig. 12, the electronic device includes: at least one processor 31 and a memory 32. The memory 32 is communicatively coupled to the at least one processor 31, for example, the memory 32 and the at least one processor 31 are coupled via a bus. The memory 32 stores instructions executable by the at least one processor 31 to cause the at least one processor 31 to perform the steps of the PIR sensor signal triggering method as described above.
Embodiments of the present invention also provide a non-transitory computer-readable storage medium storing instructions that, when executed by a processor, cause the processor to perform the steps of the PIR sensor signal triggering method as described above.
According to the PIR sensor signal triggering method and device provided by the embodiment of the invention, the characteristics that the waveforms generated by a human body, hot air and other heat sources on the PIR sensor are different are utilized, and based on the waveforms generated by the human body on the PIR sensor, by setting the first voltage threshold and the second voltage threshold, when the times that the monitoring signal generated by the PIR sensor alternately reaches the first voltage threshold and the second voltage threshold reach the set times within the preset time range beginning to time at the moment that the monitoring signal generated by the PIR sensor reaches the first voltage threshold, the triggering signal is generated, so that the accurate identification of the human body waveform and the signal triggering are realized. When a human body moves in the effective detection range of the PIR sensor, the waveform generated by a subsequent amplifying device of the PIR sensor can alternately reach the voltage threshold of the set times within a certain time, and heat sources such as hot air and the like can not alternately reach the voltage threshold of the set times within the certain time. The PIR sensor signal triggering method and the device can be applied to the existing bipolar PIR sensor equipment, the existing bipolar PIR sensor equipment does not need to be modified, only the device for realizing the PIR sensor signal triggering method and the device function of the embodiment of the invention needs to be connected to the signal output end of the existing bipolar PIR sensor equipment, the compatibility with the existing bipolar PIR sensor equipment is high, the existing bipolar PIR sensor equipment does not need to be modified, and the investment for modifying the existing bipolar PIR sensor equipment is saved.
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, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A PIR sensor signal triggering method, wherein the PIR sensor is a bipolar PIR sensor, the method comprising:
setting a first voltage threshold and a second voltage threshold; wherein the first voltage threshold is greater than a voltage offset value of a monitoring signal formed by the PIR sensor, and the second voltage threshold is less than the voltage offset value; or, the first voltage threshold is smaller than the voltage offset value, and the second voltage threshold is larger than the voltage offset value;
generating a trigger signal when the frequency that the monitoring signal generated by the PIR sensor alternately reaches the first voltage threshold and the second voltage threshold reaches a set frequency within a preset time range when the timing is started at the moment that the monitoring signal generated by the PIR sensor reaches the first voltage threshold, wherein the trigger signal is characterized in that a person enters a monitoring area of the PIR sensor; the set times are 3 or 4, and the preset time range comprises 2 to 6 seconds;
wherein the setting of the first voltage threshold and the second voltage threshold ensures: the frequency that the waveform generated by the PIR sensor by the human body alternately reaches the first voltage threshold and the second voltage threshold within the preset time range can reach the set frequency; the waveform generated by other heat sources except the human body to the PIR sensor can not alternately reach the first voltage threshold and the second voltage threshold within a preset time range, and/or the frequency of the waveform generated by other heat sources except the human body to the PIR sensor alternately reaching the first voltage threshold and the second voltage threshold can not reach the set frequency;
the PIR sensor comprises a first pyroelectric element and a second pyroelectric element which are reversely connected in series between a grounding terminal and a grid electrode of an MOS tube; the pyroelectric infrared sensor does not generate electric signal output under the condition that the heat radiation energy received by the first pyroelectric element and the second pyroelectric element is the same, and generates electric signal output under the condition that the heat radiation energy received by the first pyroelectric element and the second pyroelectric element is different.
2. A method for signal triggering from a PIR sensor according to claim 1, characterized in that:
the monitoring signal generated by the PIR sensor is generated by the PIR sensor and amplified by an operational amplifier circuit electrically connected with the PIR sensor.
3. A method for signal triggering from a PIR sensor according to claim 1, characterized in that:
the first voltage threshold is greater than the second voltage threshold; or
The first voltage threshold is less than the second voltage threshold.
4. A PIR sensor signal triggering method according to claim 1, characterized in that the monitoring signal generated by the PIR sensor alternately reaches the first voltage threshold and the second voltage threshold, in particular:
at the timing of starting timing, recording as 1 st time when the monitoring signal generated by the PIR sensor reaches the first voltage threshold;
after the 1 st time, recording as 2 nd time that the monitoring signal generated by the PIR sensor reaches the second voltage threshold;
after the 2 nd time, recording as 3 rd time that the monitoring signal generated by the PIR sensor reaches the first voltage threshold;
and so on.
5. A PIR sensor signal trigger apparatus, wherein the PIR sensor is a bipolar PIR sensor, the apparatus comprising:
a setting module for setting a first voltage threshold and a second voltage threshold; wherein the first voltage threshold is greater than a voltage offset value of a monitoring signal formed by the PIR sensor, and the second voltage threshold is less than the voltage offset value; or, the first voltage threshold is smaller than the voltage offset value, and the second voltage threshold is larger than the voltage offset value;
the recording module is used for recording the times that the monitoring signals generated by the PIR sensor alternately reach the first voltage threshold and the second voltage threshold within a preset time range when the monitoring signals generated by the PIR sensor reach the first voltage threshold; and
the signal triggering module is used for generating a triggering signal when the frequency of the monitoring signal generated by the PIR sensor recorded by the recording module alternately reaching the first voltage threshold and the second voltage threshold reaches a set frequency, wherein the triggering signal is used for indicating that a person enters the area monitored by the PIR sensor; the set times are 3 or 4, and the preset time range comprises 2 to 6 seconds;
wherein the setting of the first voltage threshold and the second voltage threshold ensures: the frequency that the waveform generated by the PIR sensor by the human body alternately reaches a first voltage threshold and a second voltage threshold within a preset time range can reach a set frequency; the waveform generated by other heat sources except the human body to the PIR sensor can not alternately reach the first voltage threshold and the second voltage threshold within a preset time range, and/or the frequency of the waveform generated by other heat sources except the human body to the PIR sensor alternately reaching the first voltage threshold and the second voltage threshold can not reach the set frequency;
the PIR sensor comprises a first pyroelectric element and a second pyroelectric element which are reversely connected in series between a grounding end and a grid electrode of an MOS tube; the pyroelectric infrared sensor does not generate electric signal output under the condition that the heat radiation energy received by the first pyroelectric element and the second pyroelectric element is the same, and generates electric signal output under the condition that the heat radiation energy received by the first pyroelectric element and the second pyroelectric element is different.
6. An electronic device, comprising:
at least one processor; and (c) a second step of,
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to cause the at least one processor to perform the steps in a PIR sensor signal triggering method according to any of claims 1 to 4.
7. A non-transitory computer-readable storage medium storing instructions that, when executed by a processor, cause the processor to perform the steps in a PIR sensor signal triggering method according to any of claims 1 to 4.
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| PCT/CN2020/078459 WO2020182099A1 (en) | 2019-03-11 | 2020-03-09 | Pir sensor signal triggering method and device |
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