CN211152299U - Double-infrared detection circuit applied to automatic illumination system of library study room - Google Patents
Double-infrared detection circuit applied to automatic illumination system of library study room Download PDFInfo
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- CN211152299U CN211152299U CN201921787392.5U CN201921787392U CN211152299U CN 211152299 U CN211152299 U CN 211152299U CN 201921787392 U CN201921787392 U CN 201921787392U CN 211152299 U CN211152299 U CN 211152299U
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Abstract
The utility model discloses a double infrared detection circuit applied to an automatic illumination system of a library study room, which comprises an inlet infrared detection unit, an outlet infrared detection unit and a data preprocessing unit; the output end of the inlet infrared detection unit is connected with the input end of the data preprocessing unit, and the output end of the outlet infrared detection unit is connected with the input end of the data preprocessing unit; the inlet infrared detection unit and the outlet infrared detection unit detect a passing human body through the infrared sensor and amplify signals through the preamplification circuit; the data preprocessing unit preprocesses the infrared detection signal. The utility model relates to a be applied to two infrared detection circuitry of library's study room automatic lighting system can use in library's study room automatic lighting system, through the human body of entry infrared detection unit, the infrared detection unit detection process of export, through data preprocessing unit statistics testing result, the illumination in output signal regulation room reduces the waste of electric power resource.
Description
Technical Field
The utility model relates to an infrared detection field particularly, relates to a be applied to two infrared detection circuitry of library's study room automatic lighting system, can use in library's study room automatic lighting system, through the human body of entry infrared detection unit, the infrared detection unit detection process of export, through data preprocessing unit statistics testing result, output signal adjusts indoor lighting, reduces the waste of electric power resource.
Background
With the popularization of information technology, the infrared detection technology is rapidly developed, and living elements of people cannot be used for infrared detection.
Reading rooms, study rooms, bookstores and the like in a library of a school are places with a large number of people coming in and going out. Therefore, the lighting in these places is almost from work to work, regardless of whether or not there are people in these places, and regardless of how many people are. Obviously, the lighting mode cannot be automatically adjusted according to the number of people in a room, is non-energy-saving from the lighting perspective, and wastes power resources.
SUMMERY OF THE UTILITY MODEL
To the problem among the correlation technique, the utility model provides a be applied to library's study room automatic lighting system's two infrared detection circuitry to overcome the above-mentioned technical problem that current correlation technique exists.
The technical scheme of the utility model is realized like this:
a double-infrared detection circuit applied to an automatic illumination system of a library study room is characterized by comprising an inlet infrared detection unit, an outlet infrared detection unit and a data preprocessing unit;
the output end of the inlet infrared detection unit is connected with the input end of the data preprocessing unit, and the output end of the outlet infrared detection unit is connected with the input end of the data preprocessing unit;
the entrance infrared detection unit comprises an infrared sensor U3, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14 and an operational amplifier U4: A. operational amplifier U4: B. operational amplifier U4: C. operational amplifier U4: D. diode D5 and diode D6;
the 2 nd pin of infrared sensor U3 respectively with the one end of resistance R8, the one end of electric capacity C9 is connected, the other end of resistance R8 with the one end of resistance R15 all connects the VCC signal, the other end ground connection of electric capacity C9, the 3 rd pin of infrared sensor U3 with the one end of resistance R9 all is grounded, the 1 st pin of infrared sensor U3 respectively with the other end of resistance R9, the one end of resistance R10 and the one end of resistance R11 are connected, the other end of resistance R11 respectively with the one end of electric capacity C10, operational amplifier U4: the non-inverting input end of A is connected, the other end of the capacitor C10 is grounded, and the other end of the resistor R10 is respectively connected with the operational amplifier U4: the inverting input end of A, one end of the capacitor C11 and one end of the resistor R12 are connected, and the operational amplifier U4: the output end of a is respectively connected with the other end of the capacitor C11, the other end of the resistor R12 and one end of the resistor R13, the other end of the resistor R13 is connected with one end of the capacitor C12, and the other end of the capacitor C12 is respectively connected with the operational amplifier U4: b, one end of the capacitor C14 and one end of the resistor R18 are connected, and the operational amplifier U4: the non-inverting input terminal of B is connected to one end of the capacitor C13, one end of the resistor R14, and one end of the resistor R16, respectively, the other end of the capacitor C13 is grounded, and the other end of the resistor R14 is connected to the other end of the resistor R15 and the operational amplifier U4: c, and the other end of the resistor R16 is connected to one end of the resistor R17, the operational amplifier U4: d, the other end of the resistor R17 is connected to ground, the other end of the resistor R18 is connected to one end of the resistor R19, and the operational amplifier U4: the output end of B is respectively connected with the other end of the capacitor C14, the other end of the resistor R19, the operational amplifier U4: c and the operational amplifier U4: d, the inverting input of the operational amplifier U4: c is connected to the anode of the diode D5, the operational amplifier U4: the output end of the D is connected with the anode of the diode D6, the cathode of the diode D5 is respectively connected with the cathode of the diode D6, one end of the resistor R20 and the 12 th pin of the integrated circuit U7, and the other end of the resistor R20 is grounded;
the outlet infrared detection unit comprises an infrared sensor U5, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a resistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a resistor R32, a resistor R33, a capacitor C15, a capacitor C16, a capacitor C17, a capacitor C18, a capacitor C19, a capacitor C20 and an operational amplifier U6: A. operational amplifier U6: B. operational amplifier U6: C. operational amplifier U6: D. diode D7 and diode D8;
the 2 nd pin of infrared sensor U5 respectively with the one end of resistance R21, the one end of electric capacity C15 is connected, the other end of resistance R21 with the one end of resistance R28 all connects the VCC signal, the other end ground connection of electric capacity C15, the 3 rd pin of infrared sensor U5 with the one end of resistance R22 all is grounded, the 1 st pin of infrared sensor U5 respectively with the other end of resistance R22, the one end of resistance R23 and the one end of resistance R24 are connected, the other end of resistance R24 respectively with the one end of electric capacity C16, operational amplifier U6: the non-inverting input end of A is connected, the other end of the capacitor C16 is grounded, and the other end of the resistor R23 is respectively connected with the operational amplifier U6: the inverting input end of A, one end of the capacitor C17 and one end of the resistor R25 are connected, and the operational amplifier U6: the output end of a is respectively connected with the other end of the capacitor C17, the other end of the resistor R25 and one end of the resistor R26, the other end of the resistor R26 is connected with one end of the capacitor C18, and the other end of the capacitor C18 is respectively connected with the operational amplifier U6: b, one end of the capacitor C20 and one end of the resistor R31 are connected, and the operational amplifier U6: the non-inverting input terminal of B is connected to one end of the capacitor C19, one end of the resistor R27, and one end of the resistor R29, respectively, the other end of the capacitor C19 is grounded, and the other end of the resistor R27 is connected to the other end of the resistor R28 and the operational amplifier U6: c, and the other end of the resistor R29 is connected to one end of the resistor R30, the operational amplifier U6: d, the other end of the resistor R30 is connected to ground, the other end of the resistor R31 is connected to one end of the resistor R32, and the operational amplifier U6: the output end of B is respectively connected with the other end of the capacitor C20, the other end of the resistor R32, the operational amplifier U6: c and the operational amplifier U6: d, the inverting input of the operational amplifier U6: c is connected to the anode of the diode D7, the operational amplifier U6: the output end of the D is connected with the anode of the diode D8, the cathode of the diode D7 is respectively connected with the cathode of the diode D8, one end of the resistor R33 and the 13 th pin of the integrated circuit U7, and the other end of the resistor R33 is grounded;
the data preprocessing unit comprises an integrated circuit U7, a resistor R34, a capacitor C21, a capacitor C22, a capacitor C23 and a crystal oscillator X1;
the 12 th pin of the integrated circuit U7 is respectively connected with the cathode of the diode D5, the cathode of the diode D6 and one end of the resistor R20, the 13 th pin of the integrated circuit U7 is respectively connected with the cathode of the diode D7, the cathode of the diode D8 and one end of the resistor R33, the 19 th pin of the integrated circuit U7 is respectively connected with one end of the crystal oscillator X1 and one end of the capacitor C21, the 18 th pin of the integrated circuit U7 is respectively connected with the other end of the crystal oscillator X1 and one end of the capacitor C22, the other end of the capacitor C21 and the other end of the capacitor C22 are both grounded, the 9 th pin of the integrated circuit U7 is respectively connected with one end of the capacitor C23 and one end of the resistor R34, the other end of the capacitor C23 is connected with a VCC signal, the other end of the resistor R34 is grounded, and the 1 st pin of the integrated circuit U7 is connected with an output signal.
Furthermore, the infrared sensor U3 and the infrared sensor U5 are pyroelectric infrared sensors P228, and are used for detecting the number of people passing through the entrance and the exit of the study room, and further obtaining the number of people in the study room.
Further, the infrared sensor U3 output of the inlet infrared detection unit is directly coupled to the operational amplifier U4: a, the output of the infrared sensor U5 of the outlet infrared detection unit is directly coupled to the operational amplifier U6: a is used for limiting the noise bandwidth, and a low-pass filter circuit is connected in series in the preamplification circuit.
Further, the resistor R13 and the capacitor C12 of the inlet infrared detection unit are coupled to the operational amplifier U4: b, further filtering and amplifying, wherein the resistor R26 and the capacitor C18 of the outlet infrared detection unit are coupled to the operational amplifier U6: and the second-stage reverse amplification circuit formed by the B is used for further filtering and amplifying, and two-stage high-gain amplification is performed, so that the signal is more stable.
Further, the operational amplifier U4: C. the operational amplifier U4: d constitutes a double-limit voltage comparator of the inlet infrared detection unit, said operational amplifier U6: C. the operational amplifier U6: d forms a double-limit voltage comparator of the outlet infrared detection unit, resists noise interference, compares input voltage and outputs signal level.
Further, the integrated circuit U7 is a singlechip AT89C52, and is used for preprocessing the received signals and outputting the preprocessing result.
The utility model has the advantages that: the system can be used in an automatic illumination system of a library study room, the passing human body is detected through the inlet infrared detection unit and the outlet infrared detection unit, the detection result is counted through the data preprocessing unit, the indoor illumination is adjusted through the output signal, and the waste of power resources is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a dual infrared detection circuit applied to an automatic illumination system of a library study room according to the embodiment of the present invention.
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 embodiments 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 all belong to the protection scope of the present invention.
According to the utility model discloses an embodiment provides a be applied to two infrared detection circuitry of library's study room automatic lighting system.
As shown in fig. 1, the dual infrared detection circuit applied to the automatic illumination system of the study room in the library according to the embodiment of the present invention is characterized by comprising an entrance infrared detection unit, an exit infrared detection unit and a data preprocessing unit;
the output end of the inlet infrared detection unit is connected with the input end of the data preprocessing unit, and the output end of the outlet infrared detection unit is connected with the input end of the data preprocessing unit;
the entrance infrared detection unit comprises an infrared sensor U3, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14 and an operational amplifier U4: A. operational amplifier U4: B. operational amplifier U4: C. operational amplifier U4: D. diode D5 and diode D6;
the 2 nd pin of infrared sensor U3 respectively with the one end of resistance R8, the one end of electric capacity C9 is connected, the other end of resistance R8 with the one end of resistance R15 all connects the VCC signal, the other end ground connection of electric capacity C9, the 3 rd pin of infrared sensor U3 with the one end of resistance R9 all is grounded, the 1 st pin of infrared sensor U3 respectively with the other end of resistance R9, the one end of resistance R10 and the one end of resistance R11 are connected, the other end of resistance R11 respectively with the one end of electric capacity C10, operational amplifier U4: the non-inverting input end of A is connected, the other end of the capacitor C10 is grounded, and the other end of the resistor R10 is respectively connected with the operational amplifier U4: the inverting input end of A, one end of the capacitor C11 and one end of the resistor R12 are connected, and the operational amplifier U4: the output end of a is respectively connected with the other end of the capacitor C11, the other end of the resistor R12 and one end of the resistor R13, the other end of the resistor R13 is connected with one end of the capacitor C12, and the other end of the capacitor C12 is respectively connected with the operational amplifier U4: b, one end of the capacitor C14 and one end of the resistor R18 are connected, and the operational amplifier U4: the non-inverting input terminal of B is connected to one end of the capacitor C13, one end of the resistor R14, and one end of the resistor R16, respectively, the other end of the capacitor C13 is grounded, and the other end of the resistor R14 is connected to the other end of the resistor R15 and the operational amplifier U4: c, and the other end of the resistor R16 is connected to one end of the resistor R17, the operational amplifier U4: d, the other end of the resistor R17 is connected to ground, the other end of the resistor R18 is connected to one end of the resistor R19, and the operational amplifier U4: the output end of B is respectively connected with the other end of the capacitor C14, the other end of the resistor R19, the operational amplifier U4: c and the operational amplifier U4: d, the inverting input of the operational amplifier U4: c is connected to the anode of the diode D5, the operational amplifier U4: the output end of the D is connected with the anode of the diode D6, the cathode of the diode D5 is respectively connected with the cathode of the diode D6, one end of the resistor R20 and the 12 th pin of the integrated circuit U7, and the other end of the resistor R20 is grounded;
the outlet infrared detection unit comprises an infrared sensor U5, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a resistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a resistor R32, a resistor R33, a capacitor C15, a capacitor C16, a capacitor C17, a capacitor C18, a capacitor C19, a capacitor C20 and an operational amplifier U6: A. operational amplifier U6: B. operational amplifier U6: C. operational amplifier U6: D. diode D7 and diode D8;
the 2 nd pin of infrared sensor U5 respectively with the one end of resistance R21, the one end of electric capacity C15 is connected, the other end of resistance R21 with the one end of resistance R28 all connects the VCC signal, the other end ground connection of electric capacity C15, the 3 rd pin of infrared sensor U5 with the one end of resistance R22 all is grounded, the 1 st pin of infrared sensor U5 respectively with the other end of resistance R22, the one end of resistance R23 and the one end of resistance R24 are connected, the other end of resistance R24 respectively with the one end of electric capacity C16, operational amplifier U6: the non-inverting input end of A is connected, the other end of the capacitor C16 is grounded, and the other end of the resistor R23 is respectively connected with the operational amplifier U6: the inverting input end of A, one end of the capacitor C17 and one end of the resistor R25 are connected, and the operational amplifier U6: the output end of a is respectively connected with the other end of the capacitor C17, the other end of the resistor R25 and one end of the resistor R26, the other end of the resistor R26 is connected with one end of the capacitor C18, and the other end of the capacitor C18 is respectively connected with the operational amplifier U6: b, one end of the capacitor C20 and one end of the resistor R31 are connected, and the operational amplifier U6: the non-inverting input terminal of B is connected to one end of the capacitor C19, one end of the resistor R27, and one end of the resistor R29, respectively, the other end of the capacitor C19 is grounded, and the other end of the resistor R27 is connected to the other end of the resistor R28 and the operational amplifier U6: c, and the other end of the resistor R29 is connected to one end of the resistor R30, the operational amplifier U6: d, the other end of the resistor R30 is connected to ground, the other end of the resistor R31 is connected to one end of the resistor R32, and the operational amplifier U6: the output end of B is respectively connected with the other end of the capacitor C20, the other end of the resistor R32, the operational amplifier U6: c and the operational amplifier U6: d, the inverting input of the operational amplifier U6: c is connected to the anode of the diode D7, the operational amplifier U6: the output end of the D is connected with the anode of the diode D8, the cathode of the diode D7 is respectively connected with the cathode of the diode D8, one end of the resistor R33 and the 13 th pin of the integrated circuit U7, and the other end of the resistor R33 is grounded;
the data preprocessing unit comprises an integrated circuit U7, a resistor R34, a capacitor C21, a capacitor C22, a capacitor C23 and a crystal oscillator X1;
the 12 th pin of the integrated circuit U7 is respectively connected with the cathode of the diode D5, the cathode of the diode D6 and one end of the resistor R20, the 13 th pin of the integrated circuit U7 is respectively connected with the cathode of the diode D7, the cathode of the diode D8 and one end of the resistor R33, the 19 th pin of the integrated circuit U7 is respectively connected with one end of the crystal oscillator X1 and one end of the capacitor C21, the 18 th pin of the integrated circuit U7 is respectively connected with the other end of the crystal oscillator X1 and one end of the capacitor C22, the other end of the capacitor C21 and the other end of the capacitor C22 are both grounded, the 9 th pin of the integrated circuit U7 is respectively connected with one end of the capacitor C23 and one end of the resistor R34, the other end of the capacitor C23 is connected with a VCC signal, the other end of the resistor R34 is grounded, and the 1 st pin of the integrated circuit U7 is connected with an output signal.
In one embodiment, the resistor R8 is connected in series between the 2 nd pin of the infrared sensor U3 and the VCC signal of the dual infrared detection circuit for reducing the radio frequency interference, the 3 rd pin of the infrared sensor U3 is grounded, the 1 st pin of the infrared sensor U3 is connected to a load resistor, i.e., the resistor R9, and the bias voltage is about 1V. The infrared sensor U3 output is directly coupled to the operational amplifier U4: a, the inverted input end of the band-pass filtering and first-stage amplifying circuit is coupled to the operational amplifier U4 through the resistor R13 and the capacitor C12: and the second stage of reverse amplification circuit formed by the B is used for further filtering and amplifying. The double-limit voltage comparator is composed of the operational amplifier U4: C. the operational amplifier U4: and D, forming. When the level of the output signal of the second-stage reverse amplification circuit is out of the voltage value set by the double-limit voltage comparator, the double-limit voltage comparator outputs a high level, which indicates that the moving human body is detected. And the second infrared detection circuit of the double infrared detection circuits has the same operation mode. The integrated circuit U7 preprocesses the received signal and outputs the result of the preprocessing.
The working principle is as follows: infrared sensor U3, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, resistance R13, resistance R14, resistance R15, resistance R16, resistance R17, resistance R18, resistance R19, resistance R20, capacitance C9, capacitance C10, capacitance C11, capacitance C12, capacitance C13, capacitance C14, operational amplifier U4: A. operational amplifier U4: B. operational amplifier U4: C. operational amplifier U4: D. the diode D5 and the diode D6 form an entrance infrared detection unit; the infrared sensor U3 is used for detecting the number of people passing through the entrance and the exit of the study room so as to obtain the number of people in the study room; the operational amplifier U4: the function of A is to couple with the output of the infrared sensor U3 directly to form the reverse input end of the band-pass filtering and first-stage amplifying circuit; the resistor R13 and the capacitor C12 are coupled to the operational amplifier U4: the second-stage reverse amplification circuit formed by the B carries out further filtering and amplification; the operational amplifier U4: C. the operational amplifier U4: d is used for forming a double-limit voltage comparator.
Infrared sensor U5, resistance R21, resistance R22, resistance R23, resistance R24, resistance R25, resistance R26, resistance R27, resistance R28, resistance R29, resistance R30, resistance R31, resistance R32, resistance R33, capacitance C15, capacitance C16, capacitance C17, capacitance C18, capacitance C19, capacitance C20, operational amplifier U6: A. operational amplifier U6: B. operational amplifier U6: C. operational amplifier U6: D. the diode D7 and the diode D8 form an outlet infrared detection unit; the infrared sensor U5 is used for detecting the number of people passing through the entrance and the exit of the study room so as to obtain the number of people in the study room; the operational amplifier U6: the function of A is to couple with the output of the infrared sensor U5 directly to form the reverse input end of the band-pass filtering and first-stage amplifying circuit; the resistor R26 and the capacitor C18 are coupled to the operational amplifier U6: the second-stage reverse amplification circuit formed by the B carries out further filtering and amplification; the operational amplifier U6: C. the operational amplifier U6: d is used for forming a double-limit voltage comparator.
The integrated circuit U7, the resistor R34, the capacitor C21, the capacitor C22, the capacitor C23 and the crystal oscillator X1 form a data preprocessing unit; the integrated circuit U7 is used for preprocessing the received signals and outputting the preprocessing result; the capacitor C21, the capacitor C22 and the crystal oscillator X1 are used for forming a clock circuit; the resistor R34 and the capacitor C23 are used for forming a reset circuit.
To sum up, with the help of the above technical scheme of the utility model, through designing a double infrared detection circuitry who is applied to library's study room automatic lighting system, can use in library's study room automatic lighting system, through the human body that entry infrared detection unit, the infrared detection unit of export detected the process, through data preprocessing unit statistics testing result, output signal adjusts indoor lighting, reduces the waste of electric power resource.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. A double-infrared detection circuit applied to an automatic illumination system of a library study room is characterized by comprising an inlet infrared detection unit, an outlet infrared detection unit and a data preprocessing unit;
the output end of the inlet infrared detection unit is connected with the input end of the data preprocessing unit, and the output end of the outlet infrared detection unit is connected with the input end of the data preprocessing unit;
the entrance infrared detection unit comprises an infrared sensor U3, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R14, a resistor R15, a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a capacitor C9, a capacitor C10, a capacitor C11, a capacitor C12, a capacitor C13, a capacitor C14 and an operational amplifier U4: A. operational amplifier U4: B. operational amplifier U4: C. operational amplifier U4: D. diode D5 and diode D6;
the 2 nd pin of infrared sensor U3 respectively with the one end of resistance R8, the one end of electric capacity C9 is connected, the other end of resistance R8 with the one end of resistance R15 all connects the VCC signal, the other end ground connection of electric capacity C9, the 3 rd pin of infrared sensor U3 with the one end of resistance R9 all is grounded, the 1 st pin of infrared sensor U3 respectively with the other end of resistance R9, the one end of resistance R10 and the one end of resistance R11 are connected, the other end of resistance R11 respectively with the one end of electric capacity C10, operational amplifier U4: the non-inverting input end of A is connected, the other end of the capacitor C10 is grounded, and the other end of the resistor R10 is respectively connected with the operational amplifier U4: the inverting input end of A, one end of the capacitor C11 and one end of the resistor R12 are connected, and the operational amplifier U4: the output end of a is respectively connected with the other end of the capacitor C11, the other end of the resistor R12 and one end of the resistor R13, the other end of the resistor R13 is connected with one end of the capacitor C12, and the other end of the capacitor C12 is respectively connected with the operational amplifier U4: b, one end of the capacitor C14 and one end of the resistor R18 are connected, and the operational amplifier U4: the non-inverting input terminal of B is connected to one end of the capacitor C13, one end of the resistor R14, and one end of the resistor R16, respectively, the other end of the capacitor C13 is grounded, and the other end of the resistor R14 is connected to the other end of the resistor R15 and the operational amplifier U4: c, and the other end of the resistor R16 is connected to one end of the resistor R17, the operational amplifier U4: d, the other end of the resistor R17 is connected to ground, the other end of the resistor R18 is connected to one end of the resistor R19, and the operational amplifier U4: the output end of B is respectively connected with the other end of the capacitor C14, the other end of the resistor R19, the operational amplifier U4: c and the operational amplifier U4: d, the inverting input of the operational amplifier U4: c is connected to the anode of the diode D5, the operational amplifier U4: the output end of the D is connected with the anode of the diode D6, the cathode of the diode D5 is respectively connected with the cathode of the diode D6 and one end of the resistor R20, and the other end of the resistor R20 is grounded;
the outlet infrared detection unit comprises an infrared sensor U5, a resistor R21, a resistor R22, a resistor R23, a resistor R24, a resistor R25, a resistor R26, a resistor R27, a resistor R28, a resistor R29, a resistor R30, a resistor R31, a resistor R32, a resistor R33, a capacitor C15, a capacitor C16, a capacitor C17, a capacitor C18, a capacitor C19, a capacitor C20 and an operational amplifier U6: A. operational amplifier U6: B. operational amplifier U6: C. operational amplifier U6: D. diode D7 and diode D8;
the 2 nd pin of infrared sensor U5 respectively with the one end of resistance R21, the one end of electric capacity C15 is connected, the other end of resistance R21 with the one end of resistance R28 all connects the VCC signal, the other end ground connection of electric capacity C15, the 3 rd pin of infrared sensor U5 with the one end of resistance R22 all is grounded, the 1 st pin of infrared sensor U5 respectively with the other end of resistance R22, the one end of resistance R23 and the one end of resistance R24 are connected, the other end of resistance R24 respectively with the one end of electric capacity C16, operational amplifier U6: the non-inverting input end of A is connected, the other end of the capacitor C16 is grounded, and the other end of the resistor R23 is respectively connected with the operational amplifier U6: the inverting input end of A, one end of the capacitor C17 and one end of the resistor R25 are connected, and the operational amplifier U6: the output end of a is respectively connected with the other end of the capacitor C17, the other end of the resistor R25 and one end of the resistor R26, the other end of the resistor R26 is connected with one end of the capacitor C18, and the other end of the capacitor C18 is respectively connected with the operational amplifier U6: b, one end of the capacitor C20 and one end of the resistor R31 are connected, and the operational amplifier U6: the non-inverting input terminal of B is connected to one end of the capacitor C19, one end of the resistor R27, and one end of the resistor R29, respectively, the other end of the capacitor C19 is grounded, and the other end of the resistor R27 is connected to the other end of the resistor R28 and the operational amplifier U6: c, and the other end of the resistor R29 is connected to one end of the resistor R30, the operational amplifier U6: d, the other end of the resistor R30 is connected to ground, the other end of the resistor R31 is connected to one end of the resistor R32, and the operational amplifier U6: the output end of B is respectively connected with the other end of the capacitor C20, the other end of the resistor R32, the operational amplifier U6: c and the operational amplifier U6: d, the inverting input of the operational amplifier U6: c is connected to the anode of the diode D7, the operational amplifier U6: the output end of the D is connected with the anode of the diode D8, the cathode of the diode D7 is respectively connected with the cathode of the diode D8 and one end of the resistor R33, and the other end of the resistor R33 is grounded;
the data preprocessing unit comprises an integrated circuit U7, a resistor R34, a capacitor C21, a capacitor C22, a capacitor C23 and a crystal oscillator X1;
the 12 th pin of the integrated circuit U7 is respectively connected with the cathode of the diode D5, the cathode of the diode D6 and one end of the resistor R20, the 13 th pin of the integrated circuit U7 is respectively connected with the cathode of the diode D7, the cathode of the diode D8 and one end of the resistor R33, the 19 th pin of the integrated circuit U7 is respectively connected with one end of the crystal oscillator X1 and one end of the capacitor C21, the 18 th pin of the integrated circuit U7 is respectively connected with the other end of the crystal oscillator X1 and one end of the capacitor C22, the other end of the capacitor C21 and the other end of the capacitor C22 are both grounded, the 9 th pin of the integrated circuit U7 is respectively connected with one end of the capacitor C23 and one end of the resistor R34, the other end of the capacitor C23 is connected with a VCC signal, the other end of the resistor R34 is grounded, and the 1 st pin of the integrated circuit U7 is connected with an output signal.
2. The dual infrared detection circuit applied to the automatic illumination system of the library study room as claimed in claim 1, wherein the infrared sensor U3 and the infrared sensor U5 are pyroelectric infrared sensors P228.
3. The dual infrared detection circuit as claimed in claim 1, wherein the output of the infrared sensor U3 of the entrance infrared detection unit is directly coupled to the operational amplifier U4: a, the output of the infrared sensor U5 of the outlet infrared detection unit is directly coupled to the operational amplifier U6: a forms the reverse input end of the band-pass filtering and first-stage amplifying circuit.
4. The dual infrared detection circuit applied to the automatic illumination system of the library study room as claimed in claim 1, wherein the resistor R13 and the capacitor C12 of the entrance infrared detection unit are coupled to the operational amplifier U4: b, the resistor R26 and the capacitor C18 of the outlet infrared detection unit are coupled to the operational amplifier U6: b, a second stage of reverse amplification circuit.
5. The dual infrared detection circuit applied to the automatic illumination system of the library study room as claimed in claim 1, wherein the operational amplifier U4: C. the operational amplifier U4: d constitutes a double-limit voltage comparator of the inlet infrared detection unit, said operational amplifier U6: C. the operational amplifier U6: d constitutes a double-limit voltage comparator of the outlet infrared detection unit.
6. The dual infrared detection circuit applied to the automatic illumination system of the library study room as claimed in claim 1, wherein the integrated circuit U7 is a single chip microcomputer AT89C 52.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921787392.5U CN211152299U (en) | 2019-10-23 | 2019-10-23 | Double-infrared detection circuit applied to automatic illumination system of library study room |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921787392.5U CN211152299U (en) | 2019-10-23 | 2019-10-23 | Double-infrared detection circuit applied to automatic illumination system of library study room |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211152299U true CN211152299U (en) | 2020-07-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921787392.5U Expired - Fee Related CN211152299U (en) | 2019-10-23 | 2019-10-23 | Double-infrared detection circuit applied to automatic illumination system of library study room |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211152299U (en) |
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2019
- 2019-10-23 CN CN201921787392.5U patent/CN211152299U/en not_active Expired - Fee Related
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