CN207503253U - A kind of reader based on NB-IoT - Google Patents

Abstract

The utility model provides a kind of reader based on NB IoT, which solve the technical issues of the installation of existing 2.4GHz readers is complicated, ability to communicate is poor, equipped with mainboard, wireless antenna, 2.4G antennas and battery, wireless antenna, 2.4G antennas and battery are connect respectively with mainboard；Mainboard is equipped with SIM card, NB IoT modules, CPU and RFID module, and by voltage matches circuit with CPU with connecting, RFID module is connect NB IoT modules with CPU, and NB IoT modules are connect with SIM card, wireless antenna, and RFID module is connect with 2.4G antennas；RFID module is equipped with radio transmitting and receiving chip, and the SPI interface of radio transmitting and receiving chip and the controlling switch of CPU connect, and the output pin of radio transmitting and receiving chip and the GPIO pin of CPU connect；The antenna output pin of radio transmitting and receiving chip is connect by antenna-matching circuit with 2.4G antennas；The power input pin of radio transmitting and receiving chip is connected by the output pin of power control circuit and CPU；The utility model can be widely applied to 2.4GHz readers.

Description

A kind of reader based on NB-IoT

Technical field

The utility model is related to a kind of reader, more particularly to a kind of reader based on NB-IoT.

Background technology

A kind of 2.4G far Distance RFIDs reader, main services and educational system, major and minor reader reading 2.4G are bis- at present The card number of frequency card, realizes the acquisition of disengaging school information.NB-IoT is the narrowband technology of Internet of things based on cellular network, is focused on low Power consumption wide area network has the characteristics that wide covering, low-power consumption, low cost, big connection, is that one kind can be widely applied in the world Emerging technology.These advantages of NB-IoT can be used on reader.

In the bigger school of some scales, the school of electronic equipment cannot be especially carried, number of student is relatively more, right The method of the position parent of student and teacher all without positioning after school.To come the parent that picks up child after school because not knowing child Position, often want the searching of blindness or wait until that child oneself looks for always, the especially more situation of school gate can be more Add trouble.Although can about good position, actual conditions may change bigger or cannot recognize at the first time in advance The position of child.If child carries smart machine, if ratio says mobile phone, wrist-watch etc, can easily solve the problems, such as this. But many times these things cannot bring school into, so just needing a kind of equipment, can be given with the position of localizing children One reference of parent and teacher.2.4GHz readers are exactly one of scheme.

As shown in Figure 1, general 2.4GHz readers are mainly used in school's disengaging school attendance, being normally applied needs to lead Secondary 2 readers.Higher level's pager will give major-minor read head to power, while be communicated with main read head.Main read head needs to lead to secondary read head News, receive secondary read head Card Reader information summarize after issue higher level's pager.The communication interface of read head and higher level's pager is substantially All it is 485,232 either Ethernets, during site operation, needs to connect up between higher level's information owner read head and secondary read head, this is just Installation is allowed to become complicated.And because the interface communications such as 485,232 apart from closer, higher level's pager installation site is from reader The problem of must not be too far away, otherwise just will appear communication abnormality.General 2.4GHz readers can not realize determining for campus student , one because connecting up, installation is more complicated, another is exactly that selected communication interface is far apart from cannot all accomplish.

Invention content

The utility model provides one kind for the technical issues of installation of existing 2.4GHz readers is complicated, ability to communicate is poor The reader based on NB-IoT that installation is simple, ability to communicate is strong.

For this purpose, the technical solution of the utility model is, equipped with mainboard, wireless antenna, 2.4G antennas and battery, wireless day Line, 2.4G antennas and battery are connect respectively with mainboard；Mainboard is equipped with SIM card, NB-IoT modules, CPU and RFID module, NB-IoT By voltage matches circuit with CPU with connecting, RFID module is connect module with CPU, NB-IoT modules and SIM card, wireless antenna Connection, RFID module are connect with 2.4G antennas；

RFID module is equipped with radio transmitting and receiving chip, and the SPI interface of radio transmitting and receiving chip and the controlling switch of CPU connect, nothing The output pin of line transceiving chip and the GPIO pin of CPU connect；The antenna output pin of radio transmitting and receiving chip passes through antenna It is connect with circuit with 2.4G antennas；The power input pin of radio transmitting and receiving chip is drawn by the output of power control circuit and CPU Foot connects；

Voltage matches circuit includes resistance R93, resistance R94 and diode D1, one end and the NB-IoT modules of resistance R93 Data send pin connection, the data receiver pin connection of the resistance R93 other ends and CPU, one end of resistance R94, diode D1 Anode connect with the data receiver pin of NB-IoT modules, the other end of resistance R94 and the power supply output of NB-IoT modules are drawn Foot, the cathode of diode D1 and the data of CPU send pin connection.

Preferably, antenna output pin includes RFP pins, RFN pins；Antenna-matching circuit includes inductance L19, inductance L15, inductance L20, capacitance C63, capacitance C64 and capacitance C111, inductance L19 both ends are connect respectively with RFP pins, RFN pins, electricity It connect with RFP pins after holding C111, inductance L20 series connection, connects after capacitance C64, inductance L15 and capacitance C63 series connection with RFN pins Connect, capacitance C63, capacitance C64 common end connect with the input pin of 2.4G antennas.

Preferably, power control circuit includes resistance R107, resistance R146, resistance R100, triode Q100 and field-effect One end of pipe U100, resistance R107 and the power control pin pin of CPU connect, the other end and the triode Q100 of resistance R107 Base stage connection；One end of resistance R146 is connect with the base stage of triode Q100, the other end and the triode Q100 of resistance R146 Emitter connection；The collector of triode Q100 is connect by resistance R100 with the source electrode of field-effect tube U100, field-effect tube The grid of U100 is connect with the collector of triode Q100, the drain electrode of field-effect tube U100 and the power input of radio transmitting and receiving chip Pin connects.

The beneficial effects of the utility model are that, equipped with NB-IoT modules, data transmission stability is good；In low-power consumption mode Under, RFID chip deep sleep only has several uA, and the power consumption of CPU low-power consumption modes is less than 3mA, and NB-IoT modules are in battery saving mode There is 5uA, the power consumption of reader in itself is less than 5mA；In the operational mode, average consumption complete machine is less than 100mA.

Description of the drawings

Fig. 1 is existing reader scheme of installation；

Fig. 2 is wireless reader connection diagram；

Fig. 3 is wireless reader attendance application scheme of installation；

Fig. 4 is the module connection figure of wireless reader；

Fig. 5 is RFID module schematic diagram；

Fig. 6 is the circuit diagram of NB-IoT modules；

Fig. 7 is the low-power consumption flow chart of the utility model；

Fig. 8 is the Card Reader interpretation flow chart of the utility model.

Symbol description in figure：

1.CPU；2.RFID modules；3.2.4G antenna；4.NB-IoT modules；5. wireless antenna；6.SIM cards；7. power supply electricity Road；8. battery；9. external solar plate；10. mainboard；11. pager.

Specific embodiment

The utility model is described further with reference to embodiment.

As shown in Figure 2,3, in attendance application, reader is communicated by NB-IoT wireless telecommunications and pager.During installation, Main reader, secondary reader are separately mounted to inside and outside school gate, and the installation site of pager is unrestricted, in the present embodiment Pager is mounted on entrance guard room.

As shown in figure 4, the 2.4GHz readers based on NB-IoT are equipped with mainboard 10, wireless antenna 5,2.4G antennas 3 and electricity Pond 8, wireless antenna 5,2.4G antennas 3, battery 8 are connect respectively with mainboard 10.

Mainboard 10 is equipped with SIM card 6, NB-IoT modules 4, CPU 1 and RFID module 2, and CPU1 passes through SPI interface and RFID moulds Block 2 communicates, and CPU1 is communicated by serial ports and NB-IoT modules 4, and NB-IoT modules 4 are connect with SIM card 6, wireless antenna 5, realizes The wireless upload function of data；RFID module 2 is connect with 2.4G antennas 3, realizes the reading to 2.4G card ID numbers；NB-IoT modules 4 connect with RFID module 2.CPU1 is connect with power supply circuit 7, and power supply circuit 7 is connect with battery 8, battery 8 and external solar plate 9 are connect by power supply circuit 7 with CPU1, and battery and solar panel provide power input to power supply circuit, ensure entire system The power supply of system.

As shown in figure 5, RFID module 2 is equipped with radio transmitting and receiving chip, which selects SI24R1 chips, The SPI interface of SI24R1 chips is connected to the controlling switch of CPU1, and the upload of realization RFID card number and CPU1 are to RFID parameter Setting, SPI interface include CE pins, CSN pins, SCK pins, MOSI pins and MISO pins.The IRQ pins of SI24R1 chips The GPIO pin of CPU1 is connected, IRQ pins are the output pins of SI24R1 chips, and low level is effective, for notifying CPU1 Data are received, prepare to receive；The GPIO pin of CPU1 is set as down trigger, when it is low level to detect IRQ pins, starts Into data receiver pattern.

The RFP pins of SI24R1 chips are first antenna output pins, and RFN pins are the second antenna output pins.RFP draws After foot, RFN pins are connect with antenna-matching circuit, it is connect with 2.4G antennas 3.Antenna-matching circuit includes inductance L19, inductance L15, inductance L20, capacitance C63, capacitance C64 and capacitance C111.RFP pins are connect by inductance L19 with RFN pins, RFP pins It is grounded after connecting with inductance L20, capacitance C111, RFN pins are grounded after connecting with inductance L15, capacitance C63 and capacitance C64,2.4G The input pin of antenna 3 is connect with the common end of capacitance C63, capacitance C64.

2.4G cards are constantly in emission state, and 1s can emit once.When 2.4G cards enter the reception of 2.4GHz readers Range, the information that 2.4G antennas will receive card enters SI24R1 chips via RFP pins, RFN pins, and chip is to receiving Data are demodulated, and IRQ pins are set to low level at this time, and notice CPU1 prepares to receive data；The data that demodulation is completed pass through SPI interface is sent to CPU1, realizes the uploading operation of card number.

The power input pin (VCC) of SI24R1 chips is connected with power control circuit, and power control circuit includes resistance R107, resistance R146, resistance R100, triode Q100 and field-effect tube U100, CPU1 power control pin be CPOWER_ CPOWER_CTL pins are set as output pin by CTL pins, are set to high level VCC power supplies, and SI24R1 chip operations are set to Low level VCC is powered off, the shutdown of SI24R1 chips.

One end of resistance R107 and the CPOWER_CTL pins of CPU1 connect, and the base stage of the other end and triode Q100 connects It connects.One end of resistance R146 is connect with the base stage of triode Q100, and the other end is connect with the emitter of triode Q100.Triode The collector of Q100 is connect by resistance R100 with the source electrode of field-effect tube U100, the grid and triode of field-effect tube U100 The collector common end connection of Q100, the drain electrode of field-effect tube U100 are connect with the power input pin of SI24R1 chips.

When receiving Low-Power Instruction, the CPOWER_CTL pins output high level of CPU1, triode Q100 conductings, field The source electrode of effect pipe U100, drain electrode conducting, the VCC pin of SI24R1 chips are powered, and SI24R1 chips will enter normal work mould Formula.When receiving work order, the I/O port output low level of CPU1, triode Q100 cut-offs, the source electrode of field-effect tube U100, Drain electrode shutdown, VCC pin no power, SI24R1 chips are in off-position.

As shown in fig. 6, NB-IoT modules 4 connect the base station of operator, installation SIM card is needed to go to register.NB-IoT modules 4 Equipped with SIM card card reading module, the USIM_VDD pins of SIM card card reading module are connect with the VCC pin of usim card seat J16, USIM_ RST pins are connect with the RST pins of usim card seat J16, and USIM_DATA pins are connect with the I/O pin of usim card seat J16, USIM_CLK pins are connect with the CLK pin of usim card seat J16.NB-IoT modules 4 read the information of usim card, flat for registering The identification of platform and equipment.

The pin power domain of NB-IoT modules 4 is 2.8V, and the power domain of CPU1 is 3.3V, in order to further reduce power consumption, It needs to increase voltage matches circuit, ensures that circuit is more stable while reduces power consumption.The data of NB-IoT modules 4 send pin (TXD Pin) pass through the data receiver pin (RXD pins) of 1k resistance R93 connections CPU1；The data receiver pin of NB-IoT modules One end of (RXD pins) connection resistance R94 and the anode of diode D1, the other end connection NB-IoT modules 4 of resistance R94 VDD_EXT pins, VDD_EXT pins are power supply output pins, and voltage is 2.8V；The data of the cathode connection CPU of diode D1 Send pin (TXD pins).

When the TXD pins output of CPU1 is low level, diode D1 conductings, the RXD pin voltages of chip are 0.3V, For low level；When the TXD pins output of CPU1 is high level, diode D1 cut-offs, the RXD pins of NB-IoT are 2.8V, are High level.NB-IoT modules and the serial communication of CPU1 are realized by resistance R93, resistance R94, diode D1.NB-IoT modules 4 RI pins by the GPIO pin of 1K resistance R92 connections CPU1, RI pins are that the ringring prompting of 4 module of NB-IoT modules draws Foot, for CPU1 to be notified to sleep and is waken up.After NB-IoT chips receive data, data are issued CPU1's by TXD pins RXD pins, CPU1 do corresponding setting according to the instruction received.CPU1 detects the state of RI pins, when RI pins are high level When sleep, when RI pins be low level when work.It is high level when the usually suspend mode of RI pins；When data is received, RI Pin becomes low level, and CPU1 detects that low level automatically wakes up, into operating mode.After CPU1 receives data, to data into Row processing, only uploads useful card number, and card number is packaged to the RXD pins that NB-IoT modules 4 are issued by the TXD pins of CPU1, NB-IoT modules 4 receive data and are uploaded to pager 11.

General equipment reader is constantly in reception state, and power consumption is higher.In the present embodiment, CPU1 is needed to complete machine Power consumption controlled, by increasing the setting of period on pager 11, carry out the switch reader of timing.In pager 11 Upper setting working time section, such as time for school 7:00-8:00th, classes are over the time 16:00-17:00；In this 2 periods, read Device is in running order, and other times section enters low-power consumption mode.

As shown in fig. 7,11 control equipment operating mode of pager, first by time point above come to pager 11 when Between section be configured.Morning 7:00, pager 11 issues Card Reader work order to major and minor reader, and NB-IoT modules 4 receive This instruction enters operating mode, while RI pins are set to low level, and CPU1 receives this low level and enters working condition, And RFID module 2 is controlled to power on, chip is allowed to enter normal mode of operation, equipment is in normal operating mode at this time.Work as work (8 at the end of period:00), information 11 issues dormancy instruction, and NB-IoT modules 4 receive this instruction and enter battery saving mode, RI pins are set to high level simultaneously；After CPU checks this high level, into low-power consumption mode, RFID moulds are also shut off The power supply of block 2, equipment will be in low-power consumption mode.First period terminates, second same first job of period flow Duan Liucheng.

Major and minor reader construct at the scene placement position it is different, one will towards outside school gate, one towards in school gate, Pager 11 is used as the identity ID of reader by the ICCID of SIM card in equipment, this identity ID be used for judging main reader, Secondary reader, this sets in advance.

As shown in figure 8, into the judgment method of out of school, it is as follows：

Step 1, reader powers on, and pager 11 first has to major and minor reader and is calibrated, it is therefore an objective to major and minor reading The clock of device synchronizes.

Step 2,2.4G cards are that 1s transmittings are primary, that is, reader 1s passes through school with regard to that can read a card number, student Door needs a period of time, if each second will upload a data, this data volume is very big, and the CPU of reader is necessary Data are screened；

The time that we select setting student to pass through school gate is 40s, and timing duration is set as 40s, is read from main reader The ID number of 2.4G cards starts timing：

A. if in 40s, main reader is read less than the card number, then is invalid card number, abandons the card number；

B. if in 40s, main reader can read the card number always, read that (student has walked out less than the card number after 40s Main reader region), the ID of the ID number of card and reader is packaged, pager 11 is uploaded to by NB-IoT modules 4；

C. if after 40s, main reader can also continue to receive the card number, then abandon the card number and (it is funny for a long time to exclude student Stay in the situation on doorway).

Step 3, secondary reader will postpone to read the ID number of 2.4G cards, also begin to timing after reading, a length of 40s during timing.

A. if in 40s, secondary reader is read less than the card number, then abandons the card number；

B. if in 40s, secondary reader can read the card number always, can also be read after 40s, then upload card number.

Step 4, pager 11 judges the card number of the upload of major and minor reader, judges identical, then generation one Record.

It is also according to above method interpretation to go out school, and only the preferential position of major and minor reader swaps round.

The mode that networking may be used in wireless reader is applied inside school, realizes and the card of student 2.4G is determined Position is further realized the positioning of student position, is as follows：

Step 1, reader is arranged in the key position point of school, all reader datas upload to same pager On 11, the Networking Design of multiple readers is realized.Pager 11 is in advance acquired the reader information of arrangement, by reader The position installed with practical reader of ID number aligned, that is, first reader and location information are associated.

Step 2, the 2.4G antennas 3 inside reader read the information of card, and information is reported to by NB-IoT modules 4 Machine 11, the information the inside reported carry the ID number of reader, and pager 11 can be provided by ID number and location information works as The up till now specific location of card.Pager 11 extracts card image and reader ID number, can be by the form of network or short The form of letter is sent to parent.

In step 2, reader reports the situation of information to be：

Reader 1s reads a card number, and when position judgment is carried out, CPU1 reads card image for the first time, identifies Card enters the range of this reader, uploads this card number, while card number is judged：If can read always, do not do Processing；If read less than the card number, upload information, identification card leave the range of this reader again.

Other readers do similary processing, demarcate the position of card by way of this positioning reader, further The position of student is identified, the position range of student is greatly reduced, facilitates positioning of the parent to child.

NB-IoT data transmission stabilities are verified via various internet of things equipment；In terms of low-power consumption simultaneously, radio frequency Chip deep sleep only has several uA, and the power consumption of CPU1 low-power consumption modes is less than 3mA, and NB-IoT modules 4 only have in battery saving mode 5uA, the power consumption of reader in itself are less than 5mA；It is less than 100mA in operating mode average consumption complete machine.So suitable electricity of selection Pond can fully meet requirement, and battery after electricity by solar energy without that can be supplemented.

For the application of attendance, actual test 500, which opens card rate on card, can realize 100%, in unidirectional disengaging, two-way disengaging Deng experiment in it is all consistent with general reader performance.Identification of the 2.4GHz readers to card image, can be with basic fixed position Raw position.

Only as described above, only specific embodiment of the utility model, when the utility model cannot be limited with this The range of implementation, therefore the displacement of its equivalent assemblies or the equivalent variations made according to the utility model patent protection domain and modification, It all should still belong to the scope that the utility model claims book is covered.

Claims (3)

1. a kind of reader based on NB-IoT, it is characterized in that, equipped with mainboard, wireless antenna, 2.4G antennas and battery, the nothing Wire antenna, 2.4G antennas and battery are connect respectively with the mainboard；The mainboard be equipped with SIM card, NB-IoT modules, CPU and RFID module, the NB-IoT modules by voltage matches circuit with the CPU with connecting, the RFID module and the CPU Connection, the NB-IoT modules are connect with the SIM card, wireless antenna, and the RFID module is connect with the 2.4G antennas；

The RFID module is equipped with radio transmitting and receiving chip, the controlling switch of the SPI interface of the radio transmitting and receiving chip and the CPU Connection, the output pin of the radio transmitting and receiving chip are connect with the GPIO pin of the CPU；The antenna of the radio transmitting and receiving chip Output pin is connect by antenna-matching circuit with the 2.4G antennas；The power input pin of the radio transmitting and receiving chip passes through Power control circuit is connect with the output pin of the CPU；

The voltage matches circuit includes one end of resistance R93, resistance R94 and diode D1, the resistance R93 and the NB- The data of IoT modules send pin connection, and the resistance R93 other ends are connect with the data receiver pin of the CPU, the electricity One end of resistance R94, the anode of diode D1 are connect with the data receiver pin of the NB-IoT modules, and the resistance R94's is another One end and the power supply output pin of the NB-IoT modules, the cathode of the diode D1 send pin with the data of the CPU Connection.

2. the reader according to claim 1 based on NB-IoT, which is characterized in that the antenna output pin includes RFP pins, RFN pins；The antenna-matching circuit include inductance L19, inductance L15, inductance L20, capacitance C63, capacitance C64 and Capacitance C111, the inductance L19 both ends are connect respectively with the RFP pins, RFN pins, the capacitance C111, inductance L20 string It connect, is connect after the capacitance C64, inductance L15 and capacitance C63 series connection with the RFN pins, institute with the RFP pins after connection State capacitance C63, the common end of capacitance C64 is connect with the input pin of the 2.4G antennas.

3. the reader according to claim 1 or 2 based on NB-IoT, which is characterized in that the power control circuit packet Include resistance R107, resistance R146, resistance R100, triode Q100 and field-effect tube U100, one end of the resistance R107 and institute The power control pin pin connection of CPU is stated, the other end of the resistance R107 is connect with the base stage of the triode Q100；Institute The one end for stating resistance R146 is connect with the base stage of the triode Q100, the other end and the triode of the resistance R146 The emitter connection of Q100；The source that the collector of the triode Q100 passes through the resistance R100 and field-effect tube U100 Pole connects, and the grid of the field-effect tube U100 is connect with the collector of the triode Q100, the field-effect tube U100's Drain electrode is connect with the power input pin of the radio transmitting and receiving chip.