CN103969401A - Networked intelligent CO sensor - Google Patents
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- CN103969401A CN103969401A CN201410172865.6A CN201410172865A CN103969401A CN 103969401 A CN103969401 A CN 103969401A CN 201410172865 A CN201410172865 A CN 201410172865A CN 103969401 A CN103969401 A CN 103969401A
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- 238000004891 communication Methods 0.000 claims abstract description 68
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- 238000001514 detection method Methods 0.000 claims abstract description 7
- 230000002093 peripheral effect Effects 0.000 claims abstract description 7
- 238000005259 measurement Methods 0.000 claims abstract description 6
- 238000005070 sampling Methods 0.000 claims description 11
- 238000013519 translation Methods 0.000 claims description 8
- 238000003860 storage Methods 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 5
- 230000002776 aggregation Effects 0.000 claims description 3
- 238000004220 aggregation Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 238000005538 encapsulation Methods 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 230000007246 mechanism Effects 0.000 claims description 3
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- 229920005994 diacetyl cellulose Polymers 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
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- 238000004880 explosion Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000006243 chemical reaction Methods 0.000 description 1
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Abstract
The invention discloses a networked intelligent CO sensor which adopts an application layer protocol based on I<2>C bus, and comprises a four-wire socket, a power circuit, a communication interface circuit, a CO detection converting circuit and a singlechip circuit, wherein two power lines of the four-wire socket are connected with the power circuit; two communication lines of the four-wire socket are I<2>C communication lines, and connected with the communication interface circuit; the communication interface circuit is connected with the singlechip circuit; the singlechip circuit adopts a singchip STM32L151C8T6 with a Cortex-M3 kernel; an EEPROM memory is contained in the singlechip; required DACs, ADCs and I<2>C peripherals are integrated on the singchip; the CO detection changing circuit is connected with the singlechip circuit. The networked intelligent CO sensor has an explosion-proof function, directly outputs data signals, simplifies the transmitter circuit, can obtain measurement values through unpacking of the transmitter, has a network function, can automatic allocate the addresses, and can realize the plug and play function; one transmitter can be connected with a plurality of intelligent sensors comprising intelligent CO sensors.
Description
Technical field
The present invention relates to the technical field of intelligent sensor, refer in particular to a kind of network-enabled intelligent CO sensor.
Background technology
Conventional CO sensor mostly is analog sensor, in the time being connected with transmitter for the first time, and ability use after all needing with calibrating gas, sensor to be demarcated, nominal data is stored in transmitter.If desired emat sensor more, must re-start correction.Calibration process is generally completed at use scene by user, and therefore user must have the calibrating gas of variable concentrations, and this uses CO sensor very inconvenient to user.In addition, dissimilar simulation CO sensor need to have corresponding circuit to coordinate in transmitter, and therefore the transmitter of a type can only configure specific simulation CO sensor, and this has limited the selection of user to simulation CO sensor.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art and shortcoming, a kind of intelligent CO sensor based on simple high-efficiency network agreement is provided, has explosion prevention function, its output is directly data-signal, simplified transmitter circuit, transmitter unpacks and can obtain measured value; Have network function, a transmitter can connect and comprise the multiple intelligent sensors of intelligent CO sensor, can automatically distribute address, can realize plug and play.
For achieving the above object, technical scheme provided by the present invention is: a kind of network-enabled intelligent CO sensor, and described network-enabled intelligent CO sensor becomes four line intelligence CO sensors through epoxy resin encapsulation, and its procotol adopts based on I
2the application layer protocol of C bus, it includes four line sockets, power circuit, communication interface circuit, CO detection translation circuit, single chip circuit, and wherein, two power leads of described four line sockets connect power circuits, and its two order wire is I
2c order wire, and connect communication interface circuit; Described communication interface circuit connects single chip circuit, and described single chip circuit adopts the single-chip microcomputer STM32L151C8T6 with Cortex-M3 kernel, includes eeprom memory, is integrated with required DAC, ADC and I on sheet
2c peripheral hardware; Described CO detects translation circuit and connects single chip circuit, realizes detecting that CO signal converts, and exports to the inner ADC of single-chip microcomputer STM32L151C8T6, is converted to data-signal.
Described power circuit adopts LDO power supply chip SPX3819, and the reference power source of ADC adopts REF3020, and described reference power source connects the ADC pin of single-chip microcomputer STM32L151C8T6, taking its reading as reference value, the simulating signal of other pin is proofreaied and correct.
Described communication interface circuit is by the I of single-chip microcomputer STM32L151C8T6
2c pin, connection two I
2the pull-up resistor of C order wire and esd protection chip PRTR5V0U2X composition.
Described CO detects translation circuit and is made up of CO analog sensor ME2-CO, technotron and amplifier, and its working point is set by the DAC output of single-chip microcomputer STM32L151C8T6.
The Physical layer of the procotol of described network-enabled intelligent CO sensor adopts I
2the Physical layer of C agreement, its data link layer adopts I
2a subset of C agreement, adopts I
2two kinds of communication patterns of Slave Receiver in C communication pattern and Master Transmitter, at ordinary times in Slave Receiver pattern, in the time that sending data, needs become Master Transmitter pattern, after being sent completely, again transfer Slave Receiver pattern to, wait for data receiver; I
2c agreement is supported multi-host communication mechanism, and the each node in network is reciprocity, and transmitter is an aggregation node, and for collecting data, sensor node is a detection node, for image data; In agreement, address 0 is broadcast address, the I of transmitter node
2c address is fixed as 1; Each sensor node have oneself independently No. ID, be for No. ID unique number of sensor node, form by 96, be No. ID of MCU of STM32, in the time not adopting STM32 series monolithic, can work out voluntarily sensor node ID number, as long as keep uniqueness; Sensor node is not distributing before address, by transmitter address 1 to its applied address, transmitter by broadcast mode to No. ID configuration I of application node
2c address, the address that sensor node distributes is a value between 2～127, transmitter distributes according to the sensor ID of its internal registration and idle address; In transmitter node, there is a static information table of preserving each sensor node, No. ID of containing sensor node, I
2c address, variable character and communication cycle information, this table is kept in the inside EEPROM of single-chip microcomputer; The application layer data bag of described procotol is made up of address, function number, variable name, variate-value and check code, in transmitter, preserve variable name code and for variable explain, with respect to the data dictionary of simplifying, in the time that transmitter obtains sensor data packet, can this packet be made an explanation and be shown according to this data dictionary, realize plug and play.
Described network-enabled intelligent CO sensor is supported two kinds of communication patterns, is respectively request-reply communication patterns and Publish-subscribe communication pattern; Described request-reply communication patterns is mainly used in transmitter node and sets running parameter and sensor node applied address to sensor node; Described Publish-subscribe communication pattern is mainly used in sensor node to transmitter node cycle reporting measurements and alarming value.
There are three tables of data described sensor node inside, is respectively running parameter table, real-time measuring data table and alarm meter; Described running parameter table is kept in the inner EEPROM of single-chip microcomputer, for the needed parameter of storage sensor work, upgrades by communication module, and other two other table is kept in single-chip microcomputer internal SRAM; Real time data is measured in described real-time measuring data table storage, and the data of simultaneously preserving three time points can realize rate of change and report to the police, and are upgraded by cycle data acquisition module; Described cycle data acquisition module gathers CO data periodically according to the running parameter of sensor, and is kept in real-time measuring data table the half that the sampling period is communication cycle together with sampling instant; Adopt monitoring module according to the running parameter of running parameter table, the real time data in real-time measuring data table to be processed, and result is kept in alarm meter; Described communication module is upgraded in time and is sent data to transmitter node according to reporting to the police, and also sends periodically data according to the communication cycle of sensor node to transmitter node simultaneously.
Compared with prior art, tool has the following advantages and beneficial effect in the present invention:
1, when this intelligent CO sensor dispatches from the factory, completed and demarcated and be stored in the inner EEPROM of single-chip microcomputer, do not needed on-site proving;
2, this intelligent CO sensor has explosion prevention function, and its output is directly data-signal, has simplified transmitter circuit, and transmitter unpacks and can obtain measured value;
3, this intelligent CO sensor adopts based on I
2the application layer protocol of C bus can be realized by programming on general single chip, realizes cost low; This agreement supports the instrument and meter for automations such as transmitter or controller to connect multiple intelligent sensors simultaneously, when transmitter is connected with intelligent sensor, can automatically identify and distribute I
2c address, has plug-and-play feature;
4, the communication mode of this intelligent CO sensor and transmitter is supported request-answer-mode and subscription/publication pattern simultaneously, is conducive to reduce bus traffic and improves real-time.
Brief description of the drawings
Fig. 1 is the structured flowchart of network-enabled intelligent CO sensor.
Fig. 2 is the data flow diagram of network-enabled intelligent CO sensor.
Fig. 3 a is the main program flow chart of network-enabled intelligent CO sensor.
Fig. 3 b is the interrupt routine process flow diagram of network-enabled intelligent CO sensor.
Embodiment
Below in conjunction with specific embodiment, the invention will be further described.
As shown in Figure 1, the network-enabled intelligent CO sensor described in the present embodiment, becomes four lines intelligence CO sensors through epoxy resin encapsulation, and its procotol adopts based on I
2the application layer protocol of C bus, it includes four line socket M100, power circuit M101, communication interface circuit M102, CO detect translation circuit M103, single chip circuit M104, wherein, by four line socket M100 and transmitter etc., other uses the instrument and meter for automation of this intelligent CO sensor or device to be connected to described network-enabled intelligent CO sensor; Two power leads of described four line socket M100 connect power circuit M101, and the power supply of whole intelligent CO sensor is provided by power circuit M101; Two order wires of described four line socket M100 are I
2c order wire, and connect communication interface circuit M102; Described communication interface circuit M102 connects single chip circuit M104, described single chip circuit M104 adopts the STM32L series low-power scm STM32L151C8T6 with Cortex-M3 kernel, include eeprom memory, on sheet, be integrated with required DAC, ADC and I
2c peripheral hardware, makes SCM peripheral circuit reduce to minimum; Described power circuit M101 adopts low noise high precision LDO power supply chip SPX3819, the reference power source of ADC adopts REF3020, because selected single-chip microcomputer does not have independent ADC reference power source pin, described reference power source connects the ADC pin of single-chip microcomputer STM32L151C8T6, taking its reading as reference value, simulating signal to other pin is proofreaied and correct,, overcome the fluctuation of single-chip simulation supply voltage; Described communication interface circuit M102 is by the I of single-chip microcomputer STM32L151C8T6
2c pin, connection two I
2the pull-up resistor of C order wire and esd protection chip PRTR5V0U2X composition; Described CO detects translation circuit M103 and connects single chip circuit M104, formed by CO analog sensor ME2-CO, technotron J177 and amplifier LMC6462, its working point is set by the DAC output of single-chip microcomputer STM32L151C8T6, can realize detecting that CO signal converts, and export to the inner ADC of single-chip microcomputer STM32L151C8T6, be converted to data-signal, then according to the parameter value of storing in EEPROM, measurement data proofreaied and correct, finally obtain CO concentration measurement.
Described in the present embodiment, the procotol of network-enabled intelligent CO sensor is at existing I
2on C bus protocol basis, increase application layer and forming, as shown in table 1 below.
Table 1-network protocol layer
The Physical layer of this agreement adopts I
2the Physical layer of C agreement, the data link layer of this agreement adopts I
2a subset of C agreement, adopts I
2two kinds of communication patterns of Slave Receiver in C communication pattern and Master Transmitter, at ordinary times in Slave Receiver pattern, in the time that sending data, needs become Master Transmitter pattern, after being sent completely, again transfer Slave Receiver pattern to, wait for data receiver.I
2c agreement is supported multi-host communication mechanism, and the each node in network is reciprocity, but plays the part of different role in the application layer of this agreement, and transmitter is an aggregation node, and for collecting data, sensor node is a detection node, for image data.In this agreement, address 0 is broadcast address, the I of transmitter node
2c address is fixed as 1.Each sensor node have oneself independently No. ID, for No. ID unique number of sensor node, by 96 (12 bytes, Device electronic signature) composition, No. ID of MCU of STM32, in the time not adopting STM32 series monolithic, can work out voluntarily sensor node ID number, as long as keep the uniqueness of native system.Sensor node is not distributing before address, by transmitter address 1 to its applied address, transmitter by broadcast mode to application node (No. ID) configuration I
2c address, the address that sensor node distributes is a value between 2～127, transmitter distributes according to the sensor ID of its internal registration and idle address.In transmitter node, there is a static information table of preserving each sensor node, No. ID of containing sensor node, I
2the information such as C address, variable character and communication cycle, this table is kept in the inside EEPROM of single-chip microcomputer.
Present networksization intelligence CO sensor is supported two kinds of communication patterns, is respectively request-reply communication patterns and Publish-subscribe communication pattern; Described request-reply communication patterns is mainly used in transmitter node and sets running parameter and sensor node applied address to sensor node; Described Publish-subscribe communication pattern is mainly used in sensor node to transmitter node cycle reporting measurements and alarming value.
The application layer data bag of this agreement is made up of address, function number, variable name, variate-value and check code, as shown in table 2 below.
Table 2-application layer data bag
| 1 byte | 1 byte | 1 byte | 4 bytes | N byte | 2 bytes |
| Address | Function number | Data length | Variable name | Variate-value | Check code |
In transmitter, preserve variable name code and corresponding variable explanation, with respect to the data dictionary of simplifying, in the time that transmitter obtains sensor data packet, can this packet be made an explanation and be shown according to this data dictionary, realize plug and play.
As shown in Figure 2, there are three tables of data sensor node inside, is respectively M301 running parameter table, M302 real-time measuring data table and M303 alarm meter.M301 running parameter table is kept in the inner EEPROM of single-chip microcomputer, for the needed parameter of storage sensor work, upgrades by M304 communication module, and other two other table is kept in single-chip microcomputer internal SRAM.Real time data is measured in the storage of M302 real-time measuring data table, and the data of simultaneously preserving three time points can realize rate of change and report to the police, and are upgraded by M305 cycle data acquisition module.M305 cycle data acquisition module gathers CO data periodically according to the running parameter of sensor, and is kept in the real-time measuring data table of M302 the half that the sampling period is communication cycle together with sampling instant.M306 is monitoring module, and M306 monitoring module is processed the real time data in M302 real-time measuring data table according to the running parameter of M301 running parameter table, and result is kept in the alarm meter of M303.M304 communication module is upgraded in time and is sent data to transmitter node according to the warning of M303 alarm meter, also sends periodically data according to the communication cycle of sensor node to transmitter node simultaneously.
The software program of present networksization intelligence CO sensor is made up of master routine and interrupt routine, and interrupt routine has System Tick Timer timing interrupt routine and I
2c receive interruption program.The every 10mS timing of timing interrupt routine once, is the timing base unit in communication cycle and sampling period, only carries out simple addition timing in this interrupt routine.As shown in Figure 3 a, after M400 intelligence CO sensor powers on, enter M401 and carry out system initialization, comprise I/O initialization and On-Chip peripheral initialization, peripheral hardware initialization comprises ADC, DAC, I
2c and System Tick Timer initialization, distribute provisional communication buffer zone, reception data buffer and real time data table, starts System Tick Timer and interrupt and I
2c receive interruption; Then enter M402 and carry out intelligent CO sensor node running parameter inspection, if having parameter not in normal range of operation, carry out initialization with default parameter, and be kept in EEPROM.Default parameter in the Flash of program storage area, is determined, can not be revised in the time of the production of intelligent CO sensor.Enter afterwards master routine circulation, M403 judges whether the sampling time arrive, if not to the communication module that enters M406; Carry out cycle data sampling otherwise enter M404, the sampling period is got the half of communication cycle, and communication cycle can configure by host computer (transmitter or controller etc.).After having sampled, enter M405 and carry out monitoring module, sampled data is processed and alarm decision, and alarming result is kept in alert data table.Enter afterwards M406 communication module, this module has coordinated user's configuration of the real-time transmission of sampling period data and alert data and the running parameter of intelligent CO sensor with communications reception interrupt routine.As shown in Figure 3 b, in the time that data packet addressed on network is this intelligent CO sensor node address or broadcast address, enter the I of M411
2c receive interruption, in M412 module, be kept in ephemeral data buffer zone receiving data, the data byte number that amendment receives simultaneously, entering afterwards M413 carries out in packet data byte length and receives data byte number and compare and determine whether last data byte, if not last byte, carry out the I of M418
2c interrupts returning; If last byte, the check code of computational data bag, whether the packet that judgement receives makes mistakes.Enter M417 if make mistakes and carry out error handling processing, comprise the zero clearing of data receiver byte number, and mark communication failure, wait master routine is processed failed communication; If check code is correct, enter M416, the data conversion storage of ephemeral data memory block in communications reception buffer zone, and data amount check zero clearing, the communication of preparing lower packet, communicates successfully mark simultaneously, waits for that master routine processes.Transmitting portion in signal procedure realizes in master routine, complete intelligent CO sensor by the cooperation of interrupt routine and master routine with the communicating by letter of host computer (transmitter or controller etc.).
The examples of implementation of the above are only the present invention's preferred embodiment, not limit practical range of the present invention with this, therefore the variation that all shapes according to the present invention, principle are done all should be encompassed in protection scope of the present invention.
Claims (7)
1. a network-enabled intelligent CO sensor, is characterized in that: described network-enabled intelligent CO sensor becomes four line intelligence CO sensors through epoxy resin encapsulation, and its procotol adopts based on I
2the application layer protocol of C bus, it includes four line sockets (M100), power circuit (M101), communication interface circuit (M102), CO detection translation circuit (M103), single chip circuit (M104), wherein, two power leads of described four line sockets (M100) connect power circuit (M101), and its two order wire is I
2c order wire, and connect communication interface circuit (M102); Described communication interface circuit (M102) connects single chip circuit (M104), described single chip circuit (M104) adopts the single-chip microcomputer STM32L151C8T6 with Cortex-M3 kernel, include eeprom memory, on sheet, be integrated with required DAC, ADC and I
2c peripheral hardware; Described CO detects translation circuit (M103) and connects single chip circuit (M104), realizes detecting that CO signal converts, and exports to the inner ADC of single-chip microcomputer STM32L151C8T6, is converted to data-signal.
2. a kind of network-enabled intelligent CO sensor according to claim 1, it is characterized in that: described power circuit (M101) adopts LDO power supply chip SPX3819, the reference power source of ADC adopts REF3020, described reference power source connects the ADC pin of single-chip microcomputer STM32L151C8T6, taking its reading as reference value, the simulating signal of other pin is proofreaied and correct.
3. a kind of network-enabled intelligent CO sensor according to claim 1, is characterized in that: described communication interface circuit (M102) is by the I of single-chip microcomputer STM32L151C8T6
2c pin, connection two I
2the pull-up resistor of C order wire and esd protection chip PRTR5V0U2X composition.
4. a kind of network-enabled intelligent CO sensor according to claim 1, it is characterized in that: described CO detects translation circuit (M103) and is made up of CO analog sensor ME2-CO, technotron (J177) and amplifier (LMC6462), its working point is set by the DAC output of single-chip microcomputer STM32L151C8T6.
5. a kind of network-enabled intelligent CO sensor according to claim 1, is characterized in that: the Physical layer of the procotol of described network-enabled intelligent CO sensor adopts I
2the Physical layer of C agreement, its data link layer adopts I
2a subset of C agreement, adopts I
2two kinds of communication patterns of Slave Receiver in C communication pattern and MasterTransmitter, at ordinary times in Slave Receiver pattern, in the time that sending data, needs become Master Transmitter pattern, after being sent completely, again transfer Slave Receiver pattern to, wait for data receiver; I
2c agreement is supported multi-host communication mechanism, and the each node in network is reciprocity, and transmitter is an aggregation node, and for collecting data, sensor node is a detection node, for image data; In agreement, address 0 is broadcast address, the I of transmitter node
2c address is fixed as 1; Each sensor node have oneself independently No. ID, be for No. ID unique number of sensor node, form by 96, be No. ID of MCU of STM32, in the time not adopting STM32 series monolithic, can work out voluntarily sensor node ID number, as long as keep uniqueness; Sensor node is not distributing before address, by transmitter address 1 to its applied address, transmitter by broadcast mode to No. ID configuration I of application node
2c address, the address that sensor node distributes is a value between 2～127, transmitter distributes according to the sensor ID of its internal registration and idle address; In transmitter node, there is a static information table of preserving each sensor node, No. ID of containing sensor node, I
2c address, variable character and communication cycle information, this table is kept in the inside EEPROM of single-chip microcomputer; The application layer data bag of described procotol is made up of address, function number, variable name, variate-value and check code, in transmitter, preserve variable name code and for variable explain, with respect to the data dictionary of simplifying, in the time that transmitter obtains sensor data packet, can this packet be made an explanation and be shown according to this data dictionary, realize plug and play.
6. a kind of network-enabled intelligent CO sensor according to claim 1, is characterized in that: described network-enabled intelligent CO sensor is supported two kinds of communication patterns, is respectively request-reply communication patterns and Publish-subscribe communication pattern; Described request-reply communication patterns is mainly used in transmitter node and sets running parameter and sensor node applied address to sensor node; Described Publish-subscribe communication pattern is mainly used in sensor node to transmitter node cycle reporting measurements and alarming value.
7. a kind of network-enabled intelligent CO sensor according to claim 5, is characterized in that: there are three tables of data described sensor node inside, is respectively running parameter table, real-time measuring data table and alarm meter; Described running parameter table is kept in the inner EEPROM of single-chip microcomputer, for the needed parameter of storage sensor work, upgrades by communication module, and other two other table is kept in single-chip microcomputer internal SRAM; Real time data is measured in described real-time measuring data table storage, and the data of simultaneously preserving three time points can realize rate of change and report to the police, and are upgraded by cycle data acquisition module; Described cycle data acquisition module gathers CO data periodically according to the running parameter of sensor, and is kept in real-time measuring data table the half that the sampling period is communication cycle together with sampling instant; Adopt monitoring module according to the running parameter of running parameter table, the real time data in real-time measuring data table to be processed, and result is kept in alarm meter; Described communication module is upgraded in time and is sent data to transmitter node according to reporting to the police, and also sends periodically data according to the communication cycle of sensor node to transmitter node simultaneously.
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| CN111405592A (en) * | 2019-12-02 | 2020-07-10 | 宁波柯力传感科技股份有限公司 | Method for rapid networking of digital sensor |
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| CN103969401B (en) | 2015-08-26 |
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