CN113487768A - Intelligent door lock touch key detection device and method - Google Patents
Intelligent door lock touch key detection device and method Download PDFInfo
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- CN113487768A CN113487768A CN202110738046.3A CN202110738046A CN113487768A CN 113487768 A CN113487768 A CN 113487768A CN 202110738046 A CN202110738046 A CN 202110738046A CN 113487768 A CN113487768 A CN 113487768A
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- 230000001939 inductive effect Effects 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 18
- 238000013459 approach Methods 0.000 claims description 12
- 230000001965 increasing effect Effects 0.000 claims description 9
- 230000035945 sensitivity Effects 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 6
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- 238000010586 diagram Methods 0.000 description 5
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- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 2
- 238000011896 sensitive detection Methods 0.000 description 2
- 230000004622 sleep time Effects 0.000 description 2
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00658—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by passive electrical keys
- G07C9/00722—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by passive electrical keys with magnetic components, e.g. magnets, magnetic strips, metallic inserts
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00944—Details of construction or manufacture
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/9618—Touch switches using a plurality of detectors, e.g. keyboard
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C2009/00968—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys shape of the data carrier
- G07C2009/00976—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys shape of the data carrier card
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
- H03K2217/94042—Means for reducing energy consumption
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Abstract
The invention discloses an intelligent door lock touch key detection device, which comprises a touch keyboard, a touch chip, a main control chip and an NFC chip, wherein the touch keyboard comprises a plurality of touch keys, an NFC coil is arranged on the touch keyboard, the touch keys are all electrically connected with the touch chip, the touch chip and the NFC chip are all electrically connected with the main control chip, and the NFC coil is electrically connected with the NFC chip, wherein: the touch keys are used for generating electric signals due to the change of ambient environment capacitance when the NFC card is close to the NFC coil; the touch chip is used for amplifying the electric signals obtained by the induction of the plurality of touch keys, generating a wake-up signal and transmitting the wake-up signal to the main control chip so as to wake up the main control chip; the main control chip controls the NFC chip to enter a working mode according to the wake-up signal; the NFC chip is used for inducing the NFC card through the NFC coil. The invention can sensitively detect the approaching action of the handheld NFC card, simplifies the circuit structure and can reduce the time of scanning the key during standby.
Description
Technical Field
The invention relates to an intelligent door lock, in particular to a touch key detection device and method for the intelligent door lock.
Background
In the prior art, the intelligent door lock has the advantages of safety, convenience, intelligence and the like, so that the market is rapidly increased. The conventional functions of the intelligent door lock comprise fingerprints, key passwords, an NFC card, remote APP, key unlocking and the like, a main control chip is arranged in the intelligent door lock and controls a peripheral chip or a functional module to realize corresponding functions, the touch keys and the NFC card are respectively provided with special chips and are connected with the main control chip through an I2C or SPI interface, and the working mode and the state of each functional chip are controlled by the main control chip. The existing intelligent door lock is generally powered by a battery, and is in a standby detection state in most of time, so the requirement on standby power consumption is very high, the standby average current of the existing intelligent door lock does not exceed 50uA, so the requirement on the standby current of an NFC card and a fingerprint chip is very low, wherein the proportion of the standby average current of the NFC card chip is relatively large and critical, in the existing intelligent door lock, the NFC card chip detects a card in the standby process in two modes, one mode is sleeping for a period of time (generally about 0.5 second), the chip recovers to be in a working state for more than a plurality of milliseconds, whether the card is close to the door lock or not is judged by detecting whether the normal data communication between the NFC card chip and the card is available in the working time, the detection mode has relatively long working time and high power consumption, and is generally applied to door lock equipment with low power consumption requirement, another detection mode is that the carrier wave change is detected and shaped by detecting the NFC radio frequency carrier wave change caused by the approach of the card, and then the carrier wave change is detected by the ADC of the main control chip, the period of time only needs tens of microseconds, only after the carrier wave change is detected to exceed a certain preset threshold, the working time of the NFC chip is increased to complete the data communication with the card, the standby average current of the detection mode is relatively less (about 20uA is achieved), and the approach detection of the FNC card is generally completed by adopting the detection mode in the application of the intelligent door lock industry.
Specifically, the intelligent door lock generally requires the 1 st touch of the key to be awakened when in standby, does not execute specific key function operation, and only switches the door lock from the standby mode to the working mode, the backlight lamp of the key is lightened and a prompt sound is emitted after awakening, and the key is pressed again to execute the corresponding key function, so that 12 digital keys or other functional keys on the door lock need to be detected simultaneously when in standby.
At present, in the application of the two detection modes of the NFC card in the intelligent door lock, the power consumption can be reduced only by adopting an intermittent working mode, and the response time and the power consumption are balanced, namely in one working cycle, if the sleep time is long, although the power consumption is low, the detection response time of the NFC card is prolonged, and the response is slow; if the sleep time is short, the power consumption is increased, and the simultaneous consideration cannot be achieved. In addition, when the door lock is in standby, 12 number keys or other functional keys need to be detected simultaneously, and the detection time and the standby power consumption are increased similarly.
In summary, how to handle the contradiction between the detection power consumption and the response duration of the NFC card and reduce the power consumption caused by detecting multiple keys during the standby period is an urgent technical problem to be solved in the prior art.
Disclosure of Invention
The invention aims to solve the technical problem of providing an intelligent door lock touch key detection device and method which can sensitively detect the approaching action of a handheld NFC card, simplify the circuit structure and reduce the scanning key duration in the standby period.
In order to solve the technical problems, the invention adopts the following technical scheme.
The utility model provides an intelligence lock touch button detection device, its is including touch keyboard, touch chip, main control chip and NFC chip, touch keyboard is including a plurality of touch buttons, be equipped with the NFC coil on the touch keyboard, a plurality of touch buttons all with touch chip electric connection, touch chip with the NFC chip all with main control chip electric connection, the NFC coil with NFC chip electric connection, wherein: the touch keys are used for generating electric signals due to the change of ambient environment capacitance when the NFC card is close to the NFC coil; the touch chip is used for amplifying the electric signals obtained by the induction of the plurality of touch keys, generating a wake-up signal and transmitting the wake-up signal to the main control chip so as to wake up the main control chip; the main control chip controls the NFC chip to enter a working mode according to the wake-up signal; the NFC chip is used for inducing the NFC card through the NFC coil.
Preferably, a signal amplifying circuit is arranged in the touch chip and comprises a first amplifier and a plurality of first built-in switches, the touch keys correspond to the first built-in switches one to one, the touch keys are connected with first ends of the first built-in switches, second ends of the first built-in switches are connected with input ends of the first amplifier after being connected in parallel, and output ends of the first amplifier are connected with an analog-to-digital conversion unit of the touch chip.
Preferably, the signal amplifying circuit includes a second amplifier and a plurality of second built-in switches, the touch keys correspond to the second built-in switches one to one, the touch keys are connected to first ends of the second built-in switches, second ends of the plurality of second built-in switches are connected to input ends of the second amplifier after being connected in parallel, and output ends of the second amplifier are connected to the analog-to-digital conversion unit of the touch chip.
Preferably, the touch chip and the main control chip communicate with each other based on an I2C interface.
Preferably, the NFC antenna also comprises a detection circuit, wherein the detection circuit comprises a first diode, a second diode, a first capacitor, a second capacitor, a first resistor and a second resistor, the anode of the first diode is connected to one end of the NFC coil, the cathode of the first diode is grounded through the first resistor and the second resistor which are sequentially connected in series, the cathode of the second diode is connected with the anode of the first diode, the anode of the second diode is grounded, one end of the first capacitor is connected to the cathode of the first diode, the other end of the first capacitor is grounded, one end of the second capacitor is connected with the junction of the first resistor and the second resistor, and the other end of the second capacitor is grounded.
Preferably, the NFC coil is arranged in a gap between the plurality of touch keys.
The method is realized on the basis of a device, the device comprises a touch keyboard, a touch chip, a main control chip and an NFC chip, the touch keyboard comprises a plurality of touch keys, an NFC coil is arranged on the touch keyboard and is arranged in gaps of the touch keys, the touch keys are electrically connected with the touch chip, the touch chip and the NFC chip are electrically connected with the main control chip, and the NFC coil is electrically connected with the NFC chip, and the method comprises the following steps: step S1, the main control chip and the NFC chip both enter a sleep state; step S2, forming a large induction disc by the touch keys, wherein when the NFC card is close to the NFC coil, the large induction disc formed by the touch keys generates an electric signal due to the change of the ambient capacitance; step S3, the touch chip detects electric signals obtained by the induction of a plurality of touch keys, amplifies the electric signals, generates an awakening signal and transmits the awakening signal to the main control chip, and then awakens the main control chip; step S4, the main control chip controls the NFC chip to enter a working mode according to the wake-up signal; and step S5, the NFC chip induces the NFC card through the NFC coil, and then reads data from the NFC card.
Preferably, in an initial state, the detection sensitivity of the touch chip to the plurality of touch keys is increased.
Preferably, the detection sensitivity condition of the touch chip satisfies: the electrical signal can be accurately detected when the touch chip performs the step S3.
Preferably, when the touch chip detects that the touch key is touched, the touch chip generates an interrupt signal and transmits the interrupt signal to the main control chip, and then wakes up the main control chip to enable the main control chip to read the specific key value.
In the intelligent door lock touch key detection device disclosed by the invention, under a normal condition, the main control chip and the NFC chip both enter a dormant state, the plurality of touch keys are electrically connected with the touch chip to form a large induction disc, when an NFC card approaches the NFC coil, the large induction disc formed by the plurality of touch keys generates an electric signal due to the change of ambient capacitance, the touch chip detects the electric signal obtained by induction of the plurality of touch keys, after amplification processing, an awakening signal is generated and transmitted to the main control chip to further awaken the main control chip, then the main control chip controls the NFC chip to enter a working mode, and the NFC chip reads data in the NFC card through the NFC coil. Among the above-mentioned device, connect all touch button together in parallel, make a plurality of touch buttons constitute a big response dish to the response area of response dish has been increased, and when the handheld NFC card of user was close to when the touch keyboard, the action of being close to of the handheld NFC card of ability sensitive detection, whole process need not NFC carrier wave detection circuit, thereby has simplified circuit structure, and it is long when scanning the button during can reducing the standby.
Drawings
FIG. 1 is a block diagram of the touch key detection device of the intelligent door lock of the present invention;
fig. 2 is a circuit schematic of an NFC chip;
FIG. 3 is a schematic circuit diagram of a detector circuit;
FIG. 4 is a block diagram of a touch keypad;
FIG. 5 is a schematic circuit diagram of a touch chip;
fig. 6 is a schematic circuit diagram of the signal amplification circuit.
Detailed Description
The invention is described in more detail below with reference to the figures and examples.
The invention discloses an intelligent door lock touch key detection device, which is shown by combining fig. 1 to fig. 6 and comprises a touch keyboard 1, a touch chip U1, a master control chip 2 and an NFC chip U2, wherein the touch keyboard 1 comprises a plurality of touch keys 10, an NFC coil 3 is arranged on the touch keyboard 1, the touch keys 10 are electrically connected with the touch chip U1, the touch chip U1 and the NFC chip U2 are electrically connected with the master control chip 2, and the NFC coil 3 is electrically connected with the NFC chip U2, wherein:
the touch keys 10 are used for generating electric signals due to the change of ambient environment capacitance when an NFC card approaches the NFC coil 3;
the touch chip U1 is configured to amplify the electrical signals obtained by sensing the plurality of touch keys 10, generate an awakening signal and transmit the awakening signal to the main control chip 2, so as to awaken the main control chip 2;
the main control chip 2 controls the NFC chip U2 to enter a working mode according to the wake-up signal;
the NFC chip U2 is used to induce the NFC card through the NFC coil 3.
In the above detection device, under a normal condition, the main control chip 2 and the NFC chip U2 both enter a sleep state, and because the touch keys 10 are electrically connected to the touch chip U1, the touch keys 10 form a large inductive disk, when the NFC card is close to the NFC coil 3, the large inductive disk formed by the touch keys 10 generates an electrical signal due to a change in ambient capacitance, the touch chip U1 detects the electrical signal obtained by sensing the touch keys 10, and after amplification processing, generates a wake-up signal and transmits the wake-up signal to the main control chip 2, so as to wake up the main control chip 2, and then the main control chip 2 controls the NFC chip U2 to enter a working mode, and the NFC chip U2 reads data in the NFC card through the NFC coil 3. Among the above-mentioned device, connect all touch button together in parallel, make a plurality of touch buttons constitute a big response dish to the response area of response dish has been increased, and when the handheld NFC card of user was close to when touch keyboard 1, the action of being close to of the handheld NFC card of ability sensitive detection, whole process need not NFC carrier detection circuit, thereby has simplified circuit structure, and it is long when scanning the button during can reducing the standby.
Referring to fig. 6, in the present embodiment, a signal amplifying circuit 4 is disposed in the touch chip U1, the signal amplifying circuit 4 includes a first amplifier CA0 and a plurality of first built-in switches 11, the touch keys 10 correspond to the first built-in switches 11 one to one, the touch keys 10 are connected to first ends of the first built-in switches 11, second ends of the plurality of first built-in switches 11 are connected to input ends of the first amplifier CA0 after being connected in parallel, and an output end of the first amplifier CA0 is connected to an analog-to-digital conversion unit ADC of the touch chip U1.
The signal amplifying circuit 4 is a key circuit added in the touch chip U1 of the present invention, and includes a group of switches composed of a plurality of first built-in switches 11, and is used for implementing a function of controlling a plurality of touch keys 10 to be connected in parallel, in the circuit, when the plurality of first built-in switches 11 are simultaneously turned on, metal areas of the plurality of touch keys 10 form a large sensing disc, and the sensing disc can sense changes of ambient capacitance, thereby generating an electrical signal and serving as a trigger basis of a subsequent circuit.
Further, in order to improve the sensing accuracy and reliability, in this embodiment, two sets of built-in switches and two amplifiers are provided, specifically, the signal amplification circuit 4 includes a second amplifier CA1 and a plurality of second built-in switches 12, the touch keys 10 correspond to the second built-in switches 12 one to one, the touch keys 10 are connected to first ends of the second built-in switches 12, second ends of the plurality of second built-in switches 12 are connected to input ends of the second amplifier CA1 after being connected to each other in parallel, and an output end of the second amplifier CA1 is connected to the analog-to-digital conversion unit ADC of the touch chip U1.
Based on the circuit principle, when the chip is designed, the first built-in switch and the second built-in switch can be realized through register setting and then are configured on the same operational amplifier, so that all keys can be used as a key with a large induction disc to be detected when in standby, approach of the handheld NFC card is detected in a suspension mode, the number of key detection in standby is reduced, the purpose of reducing power consumption is achieved, and meanwhile the capability of quick response is improved. Compared with the commonly used touch key chip in the market at present, the existing touch chip is generally set to scan the keys once in 0.5 second when in standby, and the scanning time is about 50 milliseconds.
Preferably, the touch chip U1 and the main control chip 2 communicate with each other based on an I2C interface. In this embodiment, the touch chip and the intelligent door lock main control chip adopt the communication of I2C interface, and when the lock standby, when the touch chip detected the touch button, interrupt foot INT can be pulled high, awakens up the main control chip, and the main control chip reads specific button numerical value through the I2C interface.
Of course, according to the application requirement, the present embodiment may also consider to add a detector circuit 5, please refer to fig. 2 and fig. 3, where the detector circuit 5 includes a first diode D1, a second diode D2, a first capacitor C15, a second capacitor C16, a first resistor R5 and a second resistor R6, the first diode D1, an anode of the first diode D1 is connected to one end of the NFC coil 3, a cathode of the first diode D1 is grounded through a first resistor R5 and a second resistor R6 which are sequentially connected in series, a cathode of the second diode D2 is connected to the anode of the first diode D1, an anode of the second diode D2 is grounded, one end of the first capacitor C15 is connected to the cathode of the first diode D1, the other end of the first capacitor C15 is grounded, one end of the second capacitor C16 is connected to a node of the first resistor R5 and the second resistor R6, the other end of the second capacitor C16 is grounded. The detection circuit 5 is provided to shorten the detection time of the approach of the NFC card, so as to reduce the standby current of the NFC chip.
In this embodiment, the NFC coil 3 is disposed in a gap between the touch keys 10. Specifically, the NFC antenna is designed on a PCB of the touch key board and is used as an onboard antenna and located in the middle of 12 keys, when a card is swiped, the card needs to be close to the position of the antenna, and the maximum detection distance is generally about 25 mm.
The embodiment also relates to an intelligent door lock touch key detection method, which is realized based on a device shown in fig. 1 to 6, wherein the device comprises a touch keyboard 1, a touch chip U1, a master control chip 2 and an NFC chip U2, the touch keyboard 1 comprises a plurality of touch keys 10, the touch keyboard 1 is provided with an NFC coil 3, the NFC coil 3 is arranged in gaps of the plurality of touch keys 10, the plurality of touch keys 10 are all electrically connected with the touch chip U1, the touch chip U1 and the NFC chip U2 are both electrically connected with the master control chip 2, the NFC coil 3 is electrically connected with the NFC chip U2, and the method comprises the following steps:
step S1, the main control chip 2 and the NFC chip U2 both enter a sleep state;
step S2, the plurality of touch keys 10 form a large inductive disc, and when the NFC card approaches the NFC coil 3, the large inductive disc formed by the plurality of touch keys 10 generates an electrical signal due to a change in the ambient capacitance;
step S3, the touch chip U1 detects an electrical signal induced by the plurality of touch keys 10, amplifies the electrical signal, generates an awakening signal, transmits the awakening signal to the main control chip 2, and awakens the main control chip 2;
step S4, the main control chip 2 controls the NFC chip U2 to enter a working mode according to the wake-up signal;
in step S5, the NFC chip U2 induces the NFC card through the NFC coil 3, and further reads data from the NFC card.
In the initial state, the method increases the detection sensitivity of the touch chip U1 to the plurality of touch keys 10.
Specifically, the detection sensitivity condition of the touch chip U1 satisfies: the electrical signal can be accurately detected while the touch chip U1 performs the step S3.
In practical applications, when the touch chip U1 detects that the touch key 10 is touched, the touch chip U1 generates an interrupt signal and transmits the interrupt signal to the main control chip 2, so as to wake up the main control chip 2, and enable the main control chip 2 to read a specific key value.
The invention discloses a device and a method for detecting touch keys of an intelligent door lock, which are applied to the intelligent door lock, because an NFC antenna is generally designed in the middle of the touch keys, an NFC card can inevitably approach to the induction bonding pads of the touch keys when swiping the card, the induction bonding pads of 12 digital keys are all connected together through a built-in switch of a touch chip to form a large induction bonding pad, and the middle of the large induction bonding pad is the NFC antenna, so when the NFC card approaches to the antenna by hand, the change of the ambient capacitance around the large induction bonding pad can be caused, the effect of detecting the approach of the NFC card in a suspension way can be achieved by increasing the detection sensitivity of the touch chip, thus the NFC card chip can not work in a standby state at ordinary times, when the touch chip detects that the card approaches, the touch chip informs a master control chip through an interrupt pin, and the master control chip controls the NFC card chip to enter a working mode to read card data, therefore, the contradiction between the power consumption and the response time of the NFC card is solved, because the standby power consumption of the touch chip is low, and all the number keys are connected together for detection, the detection of 12 keys is changed into the detection of 1 key, so that the detection time can be shortened, the power consumption can be further reduced, and the application requirement is well met.
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 or improvements made within the technical scope of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides an intelligence lock touch button detection device, its characterized in that, including touch keyboard (1), touch chip (U1), master control chip (2) and NFC chip (U2), touch keyboard (1) is including a plurality of touch button (10), be equipped with NFC coil (3) on touch keyboard (1), a plurality of touch button (10) all with touch chip (U1) electric connection, touch chip (U1) with NFC chip (U2) all with master control chip (2) electric connection, NFC coil (3) with NFC chip (U2) electric connection, wherein:
the touch keys (10) are used for generating electric signals due to the change of the ambient environment capacitance when an NFC card approaches the NFC coil (3);
the touch chip (U1) is used for amplifying the electric signals obtained by the induction of the touch keys (10), generating a wake-up signal and transmitting the wake-up signal to the main control chip (2), so as to wake up the main control chip (2);
the main control chip (2) controls the NFC chip (U2) to enter a working mode according to the wake-up signal;
the NFC chip (U2) is used for inducing the NFC card through the NFC coil (3).
2. The device for detecting the touch key of the intelligent door lock according to claim 1, wherein the touch chip (U1) is internally provided with a signal amplifying circuit (4), the signal amplifying circuit (4) comprises a first amplifier (CA0) and a plurality of first built-in switches (11), the touch keys (10) are in one-to-one correspondence with the first built-in switches (11), the touch keys (10) are connected with first ends of the first built-in switches (11), second ends of the plurality of first built-in switches (11) are connected with each other in parallel and then connected with input ends of the first amplifier (CA0), and output ends of the first amplifier (CA0) are connected with an analog-to-digital conversion unit (ADC) of the touch chip (U1).
3. The apparatus as claimed in claim 2, wherein the signal amplifying circuit (4) comprises a second amplifier (CA1) and a plurality of second built-in switches (12), the touch buttons (10) are in one-to-one correspondence with the second built-in switches (12), the touch buttons (10) are connected to first ends of the second built-in switches (12), second ends of the plurality of second built-in switches (12) are connected to input ends of the second amplifier (CA1) after being connected in parallel, and output ends of the second amplifier (CA1) are connected to the analog-to-digital conversion unit (ADC) of the touch chip (U1).
4. The intelligent door lock touch key detection device as claimed in claim 1, wherein the touch chip (U1) and the main control chip (2) are based on I2C interface communication.
5. The apparatus as claimed in claim 1, further comprising a detector circuit (5), wherein the detector circuit (5) comprises a first diode (D1), a second diode (D2), a first capacitor (C15), a second capacitor (C16), a first resistor (R5) and a second resistor (R6), the first diode (D1), an anode of the first diode (D1) is connected to one end of the NFC coil (3), a cathode of the first diode (D1) is connected to ground through a first resistor (R5) and a second resistor (R6) connected in series in sequence, a cathode of the second diode (D2) is connected to an anode of the first diode (D1), an anode of the second diode (D2) is connected to ground, one end of the first capacitor (C15) is connected to a cathode of the first diode (D1), the other end of the first capacitor (C15) is grounded, one end of the second capacitor (C16) is connected with the junction of the first resistor (R5) and the second resistor (R6), and the other end of the second capacitor (C16) is grounded.
6. The device for detecting the touch key of the intelligent door lock as recited in claim 5, wherein the NFC coil (3) is arranged in the gap between the plurality of touch keys (10).
7. The method for detecting the touch keys of the intelligent door lock is realized based on a device, the device comprises a touch keyboard (1), a touch chip (U1), a master control chip (2) and an NFC chip (U2), the touch keyboard (1) comprises a plurality of touch keys (10), an NFC coil (3) is arranged on the touch keyboard (1), the NFC coil (3) is arranged in gaps of the touch keys (10), the touch keys (10) are electrically connected with the touch chip (U1), the touch chip (U1) and the NFC chip (U2) are electrically connected with the master control chip (2), and the NFC coil (3) is electrically connected with the NFC chip (U2), and the method comprises the following steps:
step S1, the master control chip (2) and the NFC chip (U2) both enter a sleep state;
step S2, the touch keys (10) form a large induction disc, and when the NFC card is close to the NFC coil (3), the large induction disc formed by the touch keys (10) generates an electric signal due to the change of the ambient capacitance;
step S3, the touch chip (U1) detects electric signals obtained by induction of the touch keys (10), amplifies the electric signals, generates a wake-up signal and transmits the wake-up signal to the main control chip (2), and then wakes up the main control chip (2);
step S4, the main control chip (2) controls the NFC chip (U2) to enter a working mode according to the awakening signal;
and step S5, the NFC chip (U2) induces the NFC card through the NFC coil (3) so as to read data to the NFC card.
8. The method for detecting the touch key of the intelligent door lock as claimed in claim 7, wherein in an initial state, the detection sensitivity of the touch chip (U1) to the plurality of touch keys (10) is increased.
9. The intelligent door lock touch key detection method according to claim 8, wherein the detection sensitivity condition of the touch chip (U1) satisfies: the electrical signal can be accurately detected while the touch chip (U1) performs the step S3.
10. The method as claimed in claim 7, wherein when the touch chip (U1) detects that the touch key (10) is touched, the touch chip (U1) generates an interrupt signal and transmits the interrupt signal to the main control chip (2), so as to wake up the main control chip (2) and enable the main control chip (2) to read a specific key value.
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| CN202110738046.3A CN113487768A (en) | 2021-06-30 | 2021-06-30 | Intelligent door lock touch key detection device and method |
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| CN116306725A (en) * | 2023-05-23 | 2023-06-23 | 深圳贝特莱电子科技股份有限公司 | Double-layer touch pad and NFC function control method thereof |
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