CN113576226A - Intelligent carpet based on capacitive sensor - Google Patents
Intelligent carpet based on capacitive sensor Download PDFInfo
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- CN113576226A CN113576226A CN202110991469.6A CN202110991469A CN113576226A CN 113576226 A CN113576226 A CN 113576226A CN 202110991469 A CN202110991469 A CN 202110991469A CN 113576226 A CN113576226 A CN 113576226A
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- capacitive sensor
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- 238000012544 monitoring process Methods 0.000 claims abstract description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 8
- 239000011889 copper foil Substances 0.000 claims description 8
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 description 9
- 239000003990 capacitor Substances 0.000 description 6
- 230000003068 static effect Effects 0.000 description 6
- 230000005611 electricity Effects 0.000 description 4
- 239000006260 foam Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000003325 tomography Methods 0.000 description 3
- 206010063385 Intellectualisation Diseases 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009408 flooring Methods 0.000 description 1
- 238000010801 machine learning Methods 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
Images
Classifications
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47G—HOUSEHOLD OR TABLE EQUIPMENT
- A47G27/00—Floor fabrics; Fastenings therefor
- A47G27/02—Carpets; Stair runners; Bedside rugs; Foot mats
- A47G27/0243—Features of decorative rugs or carpets
Landscapes
- Geophysics And Detection Of Objects (AREA)
- Emergency Alarm Devices (AREA)
Abstract
An intelligent carpet based on a capacitive sensor is composed of a carpet body, an auxiliary ground mat and an above-ground sensing system, and is characterized in that (1) the above-ground sensing system is composed of a sensing node array based on the capacitive sensor, a routing node and an upper computer, (2) the sensing node array based on the capacitive sensor of the above-ground sensing system is attached to and distributed on the auxiliary ground mat and arranged below the carpet body, (3) each sensing node and one routing node of the sensing node array based on the capacitive sensor are connected through a 485 bus, (4) the routing node is connected to the upper computer in a wired or wireless mode, (5) the routing node is connected with a mains supply or indirectly connected with the mains supply through a 5v socket and supplies power to each sensing node of the sensing node array, (6) each sensing node is used for monitoring capacitance values corresponding to different conditions on the ground through the routing node, and the data is transmitted to an upper computer, and the upper computer judges whether a person falls down or enters a room for robbery according to the data.
Description
Technical Field
The application relates to an intelligent carpet based on a capacitive sensor.
The household and the rest homes gradually develop towards intellectualization, and because the method for automatically monitoring the video in real time needs to rely on a large amount of data accumulated in advance and machine learning, the intellectualization of the carpet is also an important method. Compared with the traditional carpet, the intelligent carpet integrates various sensors to sense things happening on the ground, such as falling down of old people, burglary and the like.
Background
An implementation of an intelligent carpet is based on electromagnetic tomography. Electromagnetic Tomography (EMT) is a process Tomography technique based on the principle of Electromagnetic induction, which studies the spatial distribution of substances with Electromagnetic properties. A typical EMT system can be divided into four parts: the system comprises a sensor array (namely a detection and excitation coil), a system control circuit, a data acquisition and processing circuit and an image reconstruction and characteristic parameter extraction unit. The method is used for intelligent carpets, the coils need to be detected and excited, the resolution is related to the number of the coils, the technology is complex, and the adaptability and the robustness to the application field are not high.
One implementation of smart carpet is to use smart pressure sensitive flooring under traditional carpet. As the name suggests, the intelligent pressure sensing floor uses a pressure sensor, and judges the condition on the ground by detecting the pressure from the ground, such as whether the old falls down, whether people exist on the ground, and the like. The method has the defects that a special pressure-sensitive floor is needed, the floor has certain rigidity, the sensors are embedded under the floor, and the applicability is limited.
One implementation of smart carpet is to place an array of electrostatic sensors under a conventional carpet to sense conditions on the floor, based on the principle that human activity on the carpet generates static electricity, with the closer sensors to the static electricity sensing the stronger the static signal. The method has the advantages of being sensitive to the action of people on the carpet (the action generates static electricity), and has the defects of no perception capability to the static condition on the ground and large influence by other external static electricity interference.
Therefore, there is a need for a more adaptable, robust, or applicable intelligent carpet solution.
Disclosure of Invention
The invention aims to provide a novel method.
A new intelligent carpet solution is proposed, which is based on a capacitive sensor and easy to apply and implement.
The technical scheme is as follows.
An intelligent carpet based on a capacitive sensor is composed of a carpet body [7], an auxiliary ground mat [2] and an above-ground sensing system, and is characterized in that (1) the above-ground sensing system is composed of a sensing node array [3] based on the capacitive sensor, a routing node [5] and an upper computer [6], (2) the sensing node array [3] based on the capacitive sensor of the above-ground sensing system is attached to the auxiliary ground mat [2] and arranged below the carpet body [7], (3) each sensing node [3] and a routing node [5] of the sensing node array based on the capacitive sensor are connected through a 485 bus [4], (4) the routing node is connected to the upper computer [6] in a wired or wireless mode, and (5) the routing node is connected with a commercial power or indirectly through a 5v socket and supplies power to each sensing node of the sensing node array, (6) each sensing node [3] transmits the monitored capacitance values corresponding to different conditions on the ground to an upper computer [6] through a routing node [5], and the upper computer judges whether a person falls or enters a room for robbery according to the capacitance values.
The intelligent carpet based on the capacitive sensor is characterized by comprising a capacitive plate pair, a capacitance monitoring chip, a single chip microcomputer, a peripheral circuit and a power module, wherein one plate of the capacitive plate pair is arranged on an auxiliary ground pad, and the other plate of the capacitive plate pair is integrated in the capacitance monitoring chip.
The intelligent carpet based on the capacitive sensor is characterized in that under the condition that the capacitance value monitoring chip supports the intelligent carpet, a plurality of capacitance plate pairs share one capacitance value monitoring chip, and also share one single chip microcomputer, a peripheral circuit and a power module, so that one sensing node can correspond to the plates on a plurality of auxiliary ground mats and also correspond to a plurality of unit areas on the ground. That is, in this case, one sensing node corresponds to a plurality of capacitors, and itself corresponds to one sensing region array.
One polar plate [1] in one polar plate pair of the sensing node [3] of the intelligent carpet based on the capacitive sensor is attached to the auxiliary ground mat [2], and the sensing node is characterized in that the polar plate attached to the auxiliary ground mat [2] can adopt a copper foil [1 ].
The above scheme stems from the assumption that: when a person appears or moves somewhere on the carpet, including falling, walking, etc., the original capacitance value of the underfoot capacitor array is changed. Also stems from the discovery and validation of the inventor's practice of the discipline of: the change in the value of the underfoot capacitor array is large enough to be utilized when a person is present or moving somewhere on the carpet.
Has the beneficial effects.
An intelligent carpet simple device based on a capacitance sensor is built, and the detailed implementation mode is shown in the following embodiment.
And (5) testing experiments. 8 pieces of copper foil are attached to 8 foam ground mats to form 8 capacitance sensors, and another 8 foam ground mats are placed on the capacitance sensors to serve as a carpet body. The testees stand on the intelligent carpet tiles 1#, 2#, 3#, 4#, 5#, 6#, 7#, and 8# respectively, and the corresponding capacitance values are found to be changed obviously. The corresponding capacitance value on the computer display is much larger when stepping on the electric blanket area. This demonstrates the effectiveness of the present invention in monitoring the condition of an above-ground person.
Drawings
Fig. 1 is an oblique view of the structure of the smart carpet based on capacitive sensors according to the present invention. In fig. 1, firstly, a capacitance plate, secondly, an auxiliary ground mat, thirdly, a sensing node formed by a capacitance value monitoring chip, a single chip microcomputer, a peripheral circuit and a power module, fourthly, an RS485 bus, fifthly, a routing node, sixthly, an upper computer and seventhly, a carpet body
Fig. 2 is a logic block diagram of an intelligent carpet circuit built in the embodiment.
Fig. 3 is a schematic diagram of the sensing result of stepping on the 1# sensing area.
Fig. 4 is a schematic diagram of the sensing result of stepping on the 7# sensing area.
Detailed Description
Examples are given. As mentioned above, 8 pieces of copper foil were attached to 8 foam mats to form 8 capacitive sensors, and another 8 foam mats were placed thereon to serve as a carpet body. As the capacitance value monitoring chip mentioned above, a capacitance sensor chip FDC2214 from TI corporation is used. FDC2214 is a 28-bit capacitance-to-digital conversion IC for proximity sensing and level sensing, introduced by TI corporation, and is noise and EMI resistant, high resolution, high speed, multi-channel capacitance-to-digital converter oriented to capacitive sensing solutions. The device adopts an innovative architecture based on narrow bands, can highly suppress noise and interference, and simultaneously provides high resolution under high speed conditions. One chip of the chip and 4 copper foils are matched to construct 4 capacitors, and four capacitance values are monitored, so that only two sensing nodes are involved in the embodiment. The single-chip microcomputer of the sensing nodes adopts STM32F103 of ST company, the routing nodes also adopt STM32F103, and the single-chip microcomputer responsible for sending instructions to each sensing node collects capacitance data and uploads the data to the upper computer through WIFI. The capacitor plate is made of copper foil, so that the capacitor plate is cheap and convenient. The copper foil is attached to the ground mat, a lead is welded to the copper foil and connected to the sensing node, the sensing node collects capacitance values after receiving the collection command, sends the result to the routing node through a 485 bus and then to an upper computer PC, and the PC processes data and visually displays the data.
In fig. 3 and 4, the computer visually displays the capacitance values, each small gray block in the graph represents a carpet, the capacitance values are converted into gray values after being processed, and the larger the capacitance value is, the smaller the gray value is, and the whiter the small gray block is.
Claims (4)
1. An intelligent carpet based on a capacitive sensor is composed of a carpet body [7], an auxiliary ground mat [2] and an above-ground sensing system, and is characterized in that (1) the above-ground sensing system is composed of a sensing node array [3] based on the capacitive sensor, routing nodes [5] and an upper computer [6], (2) the sensing node array [3] based on the capacitive sensor of the above-ground sensing system is attached to the auxiliary ground mat [2] and arranged below the carpet body [7], (3) each sensing node [3] and a routing node [5] of the sensing node array based on the capacitive sensor are connected through a 485 bus [4], (4) the routing node [5] is connected to the upper computer [6] in a wired or wireless mode, and (5) the routing node is connected with a commercial power or indirectly connected with the commercial power through a 5v socket, and power is supplied to each sensing node of the sensing node array, (6) each sensing node [3] transmits the monitored capacitance values corresponding to different conditions on the ground to an upper computer [6] through a routing node [5], and the upper computer judges whether a person falls or enters a room for robbery according to the capacitance values.
2. The smart carpet based on capacitive sensor according to claim 1, comprising a sensing node [3] in the sensing node array, wherein the sensing node comprises a pair of capacitive plates, a capacitive value monitoring chip, a single chip, a peripheral circuit and a power module, one of the pair of capacitive plates is disposed on the auxiliary ground pad, and the other of the pair of capacitive plates is integrated in the capacitive value monitoring chip.
3. The intelligent carpet based on capacitive sensors according to claims 1-2, wherein a sensing node [3] in the sensing node array is supported by a capacitance monitoring chip, and a plurality of capacitance plate pairs share one capacitance monitoring chip, and also share one single chip microcomputer, a peripheral circuit and a power module, so that one sensing node can correspond to a plurality of auxiliary ground pads and also correspond to a plurality of unit areas on the ground.
4. A sensing node [3] of the intelligent carpet based on the capacitive sensor according to claims 1-3, wherein one plate [1] of one plate pair is attached to the auxiliary ground mat [2], and the plate attached to the auxiliary ground mat [2] can be made of copper foil [1 ].
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CN202110991469.6A CN113576226B (en) | 2021-08-26 | 2021-08-26 | Intelligent carpet based on capacitive sensor |
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Citations (8)
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CN203812370U (en) * | 2014-05-12 | 2014-09-03 | 上海申腾信息技术有限公司 | Ground mat type fall-down detection alarm device |
US20150228177A1 (en) * | 2014-02-07 | 2015-08-13 | Dr. Dujiang Wan | Fall Detection Method and System |
US20170334070A1 (en) * | 2016-05-17 | 2017-11-23 | Comau S.P.A. | Sensorized Covering for an Industrial Device |
CN208505501U (en) * | 2018-06-25 | 2019-02-15 | 河北工业大学 | A kind of intelligent carpet based on pliable pressure sensor |
CN208550990U (en) * | 2017-08-07 | 2019-03-01 | 东莞理工学院 | A kind of residential carpet |
CN109544402A (en) * | 2018-11-28 | 2019-03-29 | 浙江理工大学 | A kind of anti-escape ticket method in scenic spot based on capacitance sensor and system |
CN110897423A (en) * | 2019-12-03 | 2020-03-24 | 江南大学 | Intelligent cushion system and pressure detection method |
CN212153602U (en) * | 2019-12-12 | 2020-12-15 | 南京信息工程大学 | Toilet bowl based on capacitive sensor |
-
2021
- 2021-08-26 CN CN202110991469.6A patent/CN113576226B/en active Active
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150228177A1 (en) * | 2014-02-07 | 2015-08-13 | Dr. Dujiang Wan | Fall Detection Method and System |
CN203812370U (en) * | 2014-05-12 | 2014-09-03 | 上海申腾信息技术有限公司 | Ground mat type fall-down detection alarm device |
US20170334070A1 (en) * | 2016-05-17 | 2017-11-23 | Comau S.P.A. | Sensorized Covering for an Industrial Device |
CN208550990U (en) * | 2017-08-07 | 2019-03-01 | 东莞理工学院 | A kind of residential carpet |
CN208505501U (en) * | 2018-06-25 | 2019-02-15 | 河北工业大学 | A kind of intelligent carpet based on pliable pressure sensor |
CN109544402A (en) * | 2018-11-28 | 2019-03-29 | 浙江理工大学 | A kind of anti-escape ticket method in scenic spot based on capacitance sensor and system |
CN110897423A (en) * | 2019-12-03 | 2020-03-24 | 江南大学 | Intelligent cushion system and pressure detection method |
CN212153602U (en) * | 2019-12-12 | 2020-12-15 | 南京信息工程大学 | Toilet bowl based on capacitive sensor |
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