JP2006275761A - Setting technique of sensor module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a setting technique of sensor modules capable of resolving characteristic dispersion, while reflecting actual operating conditions. <P>SOLUTION: Physical quantities provided to sensor modules are set at a predetermined value (step S2) and the detected values of sensor obtained or the corresponding values are collected (step S3). After the aforementioned operation is repeated more than once (step S4), based on the collected data, transform information required for suitable transformation from detected values to measured values is generated or selected (step S5). Then, the transform information is forced to be memorized in the memory within the sensor module (steps S6 and S7). Thereby, the setting is recognized to be implemented in consideration of characteristic dispersion fit to actual busy conditions. Therefore, even if characteristic dispersion exists in the sensor itself and there are different influences by a signal processing section and the like, the sensor module is capable to transmit the measured values representing the correct physical quantity. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for setting a sensor module, and more particularly, to a method for setting a sensor module that can perform conversion processing from a detected value to a measured value.

  Conventionally, a wireless sensor module in which a sensor for measuring temperature, humidity and the like and a wireless transmission unit are integrated is known (see Patent Document 1). Since the wireless sensor module can spatially separate the sensor body from equipment that uses measured values such as temperature and humidity (hereinafter referred to as “used equipment”), wireless sensor modules are placed in multiple locations. Thus, the measurement values obtained can be centrally managed, and the wireless sensor module can be moved and carried. However, in many sensors, the change in the detected value (voltage level, etc.) is not linear with respect to the change in temperature, humidity, etc., which is the object of measurement. In order to obtain a value, it is necessary to perform conversion by some method. In this case, in the case where the use device and the sensor are spatially separated as in the wireless sensor module, the conversion process may be performed on either the wireless sensor module side or the use device side.

  However, since a plurality of sensor modules may be used for one used device, if the conversion process is performed on the used device side instead of the sensor module side, the processing load on the used device side may be excessive. . Considering this point, it is considered that the conversion process from the detected value to the measured value is preferably performed in the sensor module.

  As a conversion method from a detection value to a measurement value, a method using a conversion table, a method using a conversion formula, and the like are known. In particular, if an approximate expression such as a least-square approximation polynomial is used as the conversion expression, the conversion can be performed by repeating simple four arithmetic operations, so that the processing burden on the CPU is light and the programs necessary for the operation are relatively small. There is an advantage that it is small and simple (see Patent Document 2).

  However, since some variation in characteristics inevitably exists in the sensor, the physical quantity (temperature, humidity, etc.) to be measured and the actual detection value even when the same parts are used and manufactured in the same process The relationship between and varies slightly depending on the product. Such a variation is remarkable in the humidity sensor. In particular, in a region where the humidity is high, a considerably large variation occurs depending on the product. This problem arises not only in the wireless sensor module but also in all sensor modules including a wired sensor module that connects to a user device with a cable (cable).

  As a method of reducing the influence of the characteristic variation, as described in Patent Document 3, a method of giving a correction value to the sensor itself can be considered. However, the characteristic variation can be influenced not only by the variation of the sensor itself but also by the actual use state. For example, since it is very important for a wireless sensor module to be small, a signal processing unit and a battery may be mounted on the same substrate as the sensor. In such a type of sensor module, the characteristic variation changes depending on the conversion error of the circuit of the signal processing unit and the performance of the battery to be used. Therefore, accurate measurement is not necessarily performed even if the correction value of the sensor alone is used. I couldn't.

In addition, the method using the correction value has a problem that the arithmetic expression becomes complicated because it is necessary to calculate the measurement value by calculation using both the detection value of the sensor and the correction value. Complicating arithmetic expressions brings about a decrease in the accuracy of measured values and a complicated program necessary for arithmetic operations. Therefore, it is desirable to simplify arithmetic expressions as much as possible.
Japanese Patent Publication No. 8-6955 JP-A-6-101899 JP-A-9-113310

  The present invention has been made to solve such problems, and an object of the present invention is to provide a sensor module, particularly a small sensor module setting method, which eliminates characteristic variations reflecting actual use conditions. And

  A sensor module setting method according to the present invention is a sensor module setting method in which at least one sensor and a signal processing unit that converts a detection value of the sensor into a measurement value are integrated, and is provided to the sensor module. Based on the first step of setting the physical quantity to a predetermined value, and the detected value of the sensor obtained in the first step or a value corresponding thereto, an appropriate value from the detected value to the measured value A second step of determining conversion information necessary for conversion; and a third step of storing the conversion information determined in the second step in a memory in the signal processing unit. .

  According to the present invention, the actual physical quantity is measured in the state of the sensor module in which the sensor and the signal processing unit are integrated, and the conversion information is determined based on the measured physical quantity. Variations can be taken into account. For this reason, the sensor module can transmit a measured value representing a correct physical quantity to an external device, even if the sensor itself has characteristic variations, and even if the influence received from the signal processing unit is different. It becomes possible.

  The first step is preferably performed a plurality of times while changing the physical quantity. According to this, even if the relationship between the detected value and the measured value is not one-dimensional and has a complicated relationship, accurate conversion information can be obtained.

  Moreover, it is preferable to perform 1st step simultaneously with respect to several sensor module. According to this, it becomes possible to give appropriate conversion information to each of a plurality of sensor modules.

  The second step may be executed by a setting device different from the sensor module, or may be executed by the signal processing unit itself in the sensor module. According to the former, it is possible to reduce the program to be incorporated into the sensor module, and according to the latter, it is possible to greatly simplify the control to be performed from the outside.

  The conversion information is preferably a conversion formula for converting the detected value into a measured value. Since the conversion formula can generally simplify the data amount more than the conversion table, the program amount can be simplified when described in C language or the like.

  Furthermore, the conversion information may be a coefficient used in a conversion formula for converting the detected value into a measured value. Since the coefficient used in the conversion formula has a smaller data amount than the conversion formula itself, it is possible to reduce the storage capacity of the EEPROM, flash memory, EPROM, etc. included in the signal processing unit.

  The conversion formula is preferably an approximate formula. Since the calculation of an approximate expression such as a least square approximation polynomial is a simple repetition of four arithmetic operations, the accuracy of the measurement value is improved, and the program necessary for the calculation can be simplified.

  The sensor module preferably further includes a transmission / reception circuit unit for performing communication and a battery for supplying operation power, and the sensor, the signal processing unit, the transmission / reception circuit unit, and the battery are preferably mounted on the same substrate. Such a sensor module is, for example, a wireless sensor module, which has the advantage of being movable and portable, but the sensor characteristic variation varies depending on the conversion error of the signal processing circuit and the performance of the battery used. It ’s so good. However, according to the method of the present invention, it is possible to perform correct conversion taking these into account. In this case, the conversion information determined in the second step can be transmitted into the sensor module via the transmission / reception circuit unit.

  The sensor included in the sensor module may be at least one selected from the group consisting of a temperature sensor, a humidity sensor, an illuminance sensor, an acceleration sensor, a tilt sensor, a human sensor, an impact sensor, and a toner sensor.

  Thus, the sensor module set by the method of the present invention can perform appropriate conversion according to the characteristic variation reflecting the actual use state. For this reason, the sensor module can transmit a measured value representing a correct physical quantity to an external device, even if the sensor itself has characteristic variations, and even if the influence received from the signal processing unit is different. It becomes possible.

  In addition, characteristic variations are not included in the form of correction values, but are included in the conversion information itself, such as conversion tables and conversion formulas, so that the computation at the time of conversion is not complicated, which improves the accuracy of the measured values. The program necessary for the operation can be simplified.

  Therefore, the setting method of the present invention is most effective for a small wireless sensor module that communicates with a utilization device.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a block diagram schematically showing a configuration of a wireless sensor module to be set in a preferred embodiment of the present invention, and shows an example using wireless as a communication means.

  As shown in FIG. 1, a wireless sensor module 100 to be set includes a sensor 101, an A / D converter 110, a CPU (Central Processing Unit) 120, a memory 130, a transmission / reception circuit unit 141, and an antenna 142. And an input / output terminal 143 and a battery 150.

  The sensor 101 is a sensor selected from a temperature sensor, a humidity sensor, an illuminance sensor, an acceleration sensor, a tilt sensor, a human sensor, an impact sensor, a toner sensor, and the like. As shown in FIG. 101b. The sensor element 101a is, for example, a thermistor if it is a temperature sensor, and the sensor circuit 101b is, for example, a resistance element that converts the resistance value of the thermistor into a voltage.

A / D converter 110 is a functional block for converting the detected values _{S 1} obtained from the sensor circuit 101b on the detection value _{S 2} is a digital value. That is, the detection values S ₁ obtained from the sensor circuit 101b is because it is an analog quantity such as voltage and current values, become necessary A / D converter 110 so as pretreatment for digital processing. As the resolution of the A / D converter 110, although it depends on the use of the wireless sensor module 100, the resolution is preferably 8 bits or more, and more preferably 12 bits or more.

CPU120 controls the overall operation of the wireless sensor module 100 receives the detection value S ₂ in digital form provided from the A / D converter 110, for converting it to the measurement value S ₃ such as temperature and humidity It is a functional block. Although not particularly limited, it is preferable to use a CPU 120 having a sleep function (a function for greatly reducing power consumption during standby).

  The memory 130 is a functional block for storing programs and data necessary for arithmetic processing by the CPU 120. The memory 130 includes an EEPROM 131, which is an electrically writable nonvolatile memory, in addition to a ROM (Read Only Memory) area in which basic programs and the like are stored and a RAM (Random Access Memory) area as a work area. Yes. Note that a flash memory, an EPROM, a ferroelectric memory, or the like may be used instead of the EEPROM 131 as long as it is an electrically writable nonvolatile memory.

  The A / D converter 110, the CPU 120, and the memory 130 constitute a signal processing unit 190, and each of them may be constituted by separate semiconductor ICs. As already mentioned, the wireless sensor module 100 has its characteristics. In addition, since the small size is very important, it is preferable to use a so-called one-chip microcomputer in which a part or all of these are integrated into one chip.

  The transmission / reception circuit unit 141 and the antenna 142 are functional blocks for wirelessly receiving measurement values such as temperature and humidity obtained by the conversion operation by the CPU 120 and wirelessly receiving data to be written to the EEPROM 131. The transmission / reception circuit unit 141 can also perform wired communication via the input / output terminal 143.

  The battery 150 is an element for supplying power necessary for the operation of the wireless sensor module 100, and a button-type small battery is preferably used. In the present invention, it is not essential to incorporate a battery in the sensor module. However, in order to take advantage of the wireless sensor module that it can be moved and carried, it is preferable to incorporate the battery 150 as in this embodiment. .

  FIG. 2 is a schematic plan view showing an example of the physical structure of the wireless sensor module 100.

  In the example shown in FIG. 2, each element constituting the wireless sensor module 100 has a structure mounted on the same substrate. Specifically, a sensor element 101a, a sensor circuit 101b, a signal processing unit (microcomputer chip) 190, a transmission / reception circuit unit 141, and an antenna 142 are mounted on one surface of the substrate 160, and a button type is mounted on the other surface of the substrate 160. A battery 150 is mounted. According to such a structure, since the size of the wireless sensor module 100 can be greatly reduced, the wireless sensor module 100 can be moved and carried without being connected to a commercial power source or the like. However, because of the small size, if the power consumption is not sufficiently reduced, not only the life of the battery 150 is shortened, but also the sensor element 101a and the sensor circuit depending on the conversion error of the signal processing unit 190 and the performance of the battery 150. 101b has the disadvantage of being easily affected. As will be described later, such a drawback can be greatly alleviated by using the setting method according to the present embodiment.

  FIG. 3 is a block diagram schematically showing the configuration of the setting device 200 used for setting the wireless sensor module 100.

  As shown in FIG. 3, the setting device 200 used for setting the wireless sensor module 100 includes a CPU 210, a memory 220, a transmission / reception circuit unit 230, an antenna 240, and an input / output terminal 250. Yes. What is necessary is just to supply the power supply required for each of these elements from a commercial power supply etc., for example. Therefore, the illustration of the power supply line is omitted in FIG. As the setting device 200, a normal personal computer equipped with a wireless module can be used.

  FIG. 4 is a diagram schematically showing a setting environment of the wireless sensor module 100, and shows an example using a wired connection.

  As shown in FIG. 4, in the present embodiment, setting for a plurality of wireless sensor modules 100 is performed by one setting device 200. However, this does not mean that the same setting is performed for each wireless sensor module 100, but is set individually according to the characteristics of each wireless sensor module 100.

  As shown in FIG. 4, the wireless sensor module 100 to be set is placed in a predetermined physical quantity control region 300, and an input / output terminal 143 of each wireless sensor module 100 and an input / output terminal 250 of the setting device 200. Are connected by wiring. The physical quantity control area 300 is an area in which a physical quantity to be measured by the wireless sensor module 100 can be controlled using the physical quantity changing device 310. For example, if the measurement target of the wireless sensor module 100 is temperature, a thermostatic bath is used. It is done. In this case, the physical quantity changing device 310 is a heating device or a cooling device, and is a light source if the measurement target of the wireless sensor module 100 is illuminance. The physical quantity changing device 310 is controlled by the setting device 200, whereby the physical quantity in the physical quantity control area 300 can be changed to a desired value.

  The setting of the wireless sensor module 100 can also be performed using wireless. FIG. 5 is a diagram schematically illustrating a setting environment of the wireless sensor module 100 using wireless communication. In this case, wireless communication is performed using the antenna 142 of each wireless sensor module 100 and the antenna 240 of the setting device 200.

  Next, the setting method of the wireless sensor module according to the present embodiment will be described.

  FIG. 6 is a flowchart for explaining the setting method of the wireless sensor module according to the present embodiment.

  As shown in FIG. 6, in setting the wireless sensor module, first, communication is performed between the setting device 200 and each wireless sensor module 100, thereby the ID of the wireless sensor module 100 existing in the physical quantity control region 300. Are collected (step S1). Such communication is performed using the transmission / reception circuit unit 230 included in the setting device 200 and the transmission / reception circuit unit 141 included in each wireless sensor module 100.

Next, the setting device 200 controls the physical quantity changing device 310 (for example, a heating device) to set the physical quantity (for example, temperature) in the physical quantity control region 300 to a predetermined value (step S2). Thereby, substantially the same physical quantity is applied to all the wireless sensor modules 100 placed in the physical quantity control area 300. Thus, from the wireless sensor module 100 sensor circuit 101b provided in the output of the detection values S ₁ which is an analog quantity is started, which is converted by the A / D converter 110 to detected value S ₂ in digital form . The detection value S ₂ converted into the digital format is supplied to the CPU 120, and the CPU 120 converts the detection value S _{2 as it} is or by a predetermined method and supplies it to the transmission / reception circuit unit 141, and wirelessly transmits it via the antenna 142. . When the conversion is performed by a predetermined method, it is necessary that all the wireless sensor modules 100 perform the conversion by the same method. Therefore, when the detected value is converted by a predetermined method, the obtained value is a value uniquely corresponding to the detected value.

  In such a state, the setting device 200 communicates with each wireless sensor module 100 using the transmission / reception circuit unit 230, and collects transmitted data, that is, a detected value or a value corresponding thereto (step S3). . The collected data is stored in the memory 220 in association with the ID of the wireless sensor module 100 collected in step S1. Thereby, it becomes possible to grasp | ascertain individually the relationship between the physical quantity set by step S2, and the output data (detection value or a value corresponding to this) of each wireless sensor module 100. FIG. In this case, all the output data from the wireless sensor module 100 should ideally match, but in reality, the output data from each wireless sensor module 100 also varies due to characteristic variations. The characteristic variation is mainly the variation of the sensor 101 itself. In addition, the characteristic variation is also affected by the size of the conversion error of the signal processing unit 190 and the performance of the battery 150 to be used. In particular, in the case of a sensor module in which the signal processing unit 190 and the battery 150 are mounted on the same substrate as the sensor 101 as in the present embodiment, the latter cause of variation cannot be ignored.

  Such data collection is repeatedly executed a predetermined number of times while changing the physical quantity in the physical quantity control area 300 (steps S2 to S4). As described above, the physical quantity is changed by the physical quantity changing device 310 under the control of the CPU 210. The number of repeated executions with different physical quantities is not particularly limited, but in order to grasp the characteristics of each wireless sensor module 100 more accurately, it is preferable to perform more times. When the predetermined number of times is executed, the memory 220 in the setting device 200 is in a state where the data table 221 shown in FIG. 7 is formed. As shown in FIG. 7, the data table 221 includes physical quantities (A, B, C...) And outputs (A1, A2, A3..., B1, B2, B3. ..)) Are recorded.

  Based on the data table 221, the CPU 210 generates or selects conversion information P necessary for appropriate conversion from the detected value to the measured value for each wireless sensor module 100 (step S5). The conversion information P is a conversion formula, a coefficient used for this, or a conversion table. Although not particularly limited, the conversion information P is preferably a coefficient used in the conversion formula. According to this, the required capacity of the EEPROM 131 can be reduced as compared with the case of using the conversion table. It becomes possible. As the conversion formula, an approximate formula such as a least-square approximation polynomial is preferable. According to this, the conversion can be performed by repeating simple four arithmetic operations, so that the processing load on the CPU 120 is reduced and the life of the battery 150 is extended. It becomes possible. The conversion information P may be newly generated by the calculation by the CPU 210, or the optimum information may be selected from a plurality of conversion information P stored in advance in the memory 220. Further, when a conversion formula, particularly an approximation formula such as a least square approximation polynomial, is used as the conversion information P, only the coefficient used for the conversion formula may be calculated instead of the whole formula. That is, the basic structure of the equation such as the order may be determined in advance, and the coefficient may be calculated based on the data constituting the data table 221.

  FIG. 8 is an example of the coefficients of the conversion formula generated based on the data table 221. For each wireless sensor module 100, the count of the conversion formula (first order coefficient, second order coefficient, third order coefficient,... ) Is assigned.

  When the conversion information P necessary for appropriate conversion from the detection value to the measurement value is determined for each wireless sensor module 100 in this manner, the conversion information P is then transmitted via the transmission / reception circuit unit 230. Thus, the conversion information P is stored in the EEPROM 131 of the corresponding wireless sensor module 100 (step S6). Therefore, when the conversion information P is a “conversion table”, an optimal conversion table corresponding to the characteristics of the wireless sensor module 100 is stored in the EEPROM 131, and the conversion information P is “conversion formula”. In this case, data (for example, coefficients shown in FIG. 8) necessary for the calculation of the optimum conversion formula corresponding to the characteristics of the wireless sensor module 100 is stored in the EEPROM 131. The data required for the calculation of the conversion formula is all parameters constituting the conversion formula when the entire conversion formula is transmitted. When only the coefficients used in the conversion formula are transmitted, is there. Therefore, in the latter case, the storage capacity required for the EEPROM 131 is very small.

  When the storage in the EEPROM 131 is completed, each wireless sensor module 100 transmits the fact via the transmission / reception circuit unit 141, and when the setting device 200 receives this, the series of setting operations is completed (step S7).

As described above, the optimum conversion information P corresponding to the characteristics of the wireless sensor module 100 is stored in the EEPROM 131 of each wireless sensor module 100. That is, characteristics of the wireless sensor module 100, i.e., the relationship between the actual physical quantity and the detected value S _1, it has a certain degree of variation for each wireless sensor module 100, using the setting method according to the present embodiment Since the optimum conversion information P corresponding to the characteristics of the wireless sensor module 100 is stored in the EEPROM 131, appropriate conversion can be performed in each wireless sensor module 100.

External Consequently, not only the characteristic variation of the sensor 101 itself is present, even if influence from the signal processing unit 190 and the battery 150 is not different, the wireless sensor module 100 is the measured value S ₃ representing the correct physical quantity Can be transmitted to other devices. In addition, since the characteristic variation is not included in the form of correction values but is included in the conversion information P itself such as a conversion table or conversion formula, the calculation at the time of conversion is not complicated, and this improves the accuracy of the measurement value. In addition, the program required for computation can be simplified.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. Needless to say, it is included in the range.

  For example, in the above-described embodiment, the wireless sensor module 100 that wirelessly communicates with a utilization device is targeted. However, the subject of the present invention is not limited to this, and communication with the utilization device is wired (cable). It is also possible to apply to a wired sensor module. However, as described above, it is important that the wireless sensor module is small, and considering that the signal processing unit and the battery are often mounted on the same substrate as the sensor, the application target of the present invention is as follows. It can be said that the wireless sensor module is most suitable.

  Moreover, in the said embodiment, although the determination of conversion information is performed by the setting apparatus, it can also be performed by the sensor module itself. In this case, for example, based on the detection value obtained from the sensor 101 and information on the physical quantity obtained via the transmission / reception circuit unit 141 (information indicating the actual temperature, etc.), appropriate conversion information is determined by calculation by the CPU 120, This may be recorded in the EEPROM 131.

  Further, in the above embodiment, data collection with different physical quantities is repeatedly executed multiple times, thereby generating appropriate conversion information. However, the relationship between the detected value and the measured value is one-dimensional. In some cases, it is possible to determine the conversion information only by collecting data once based on a predetermined physical quantity.

  Moreover, in the said embodiment, although it has set with respect to the some wireless sensor module 100, this invention is not limited to this, You may set with respect to a single sensor module. Absent.

  The wireless sensor module 100 used in the above embodiment includes only one sensor 101. However, as shown in FIG. 9, the wireless sensor module 100 includes a plurality of sensors 101 to 103 according to the present invention. It is possible to apply a setting method. In this case, the coefficient of the conversion formula generated based on the data table 221 is the conversion formula count (primary coefficient, secondary coefficient, 3) for each sensor of each sensor module 100 as shown in FIG. Next coefficient ...) will be assigned. As shown in FIG. 10, the order of the conversion formula may be the same for a plurality of sensors (sensor 101 and sensor 103), or may be different for a plurality of sensors (sensor 101 and sensor 102).

  The plurality of sensors 101 to 103 are various sensors such as a temperature sensor, a humidity sensor, an illuminance sensor, an acceleration sensor, a tilt sensor, a human sensor, an impact sensor, and a toner sensor. The sensor elements 101a, 102a, 103a and the sensor, respectively. The circuits 101b, 102b, and 103b are configured. The measurement targets of the plurality of sensors 101 to 103 may be different from each other, or some or all of them may be the same. For example, the three sensors 101 to 103 may be a temperature sensor, a humidity sensor, and an illuminance sensor, respectively, or all may be temperature sensors, and the sensors 101 and 102 are temperature sensors. 103 may be a humidity sensor.

  If multiple sensors with different measurement targets are included in the sensor module, multiple events can be measured at the same time, and multiple sensors with the same measurement target are included in the sensor module. For example, an event can be measured from different aspects. For example, using both a temperature sensor with high accuracy but a narrow measurable range and a temperature sensor with a wide measurable range but low accuracy, it is possible to measure over a wide temperature range while maintaining a predetermined temperature. With respect to the range, it is possible to use such as performing highly accurate temperature measurement. Further, when a temperature sensor using a thermistor and a temperature sensor using infrared rays are used in combination, it is possible to measure both the temperature near the sensor module and the temperature away from the sensor module.

It is a block diagram which shows roughly the structure of the wireless sensor module 100 used as setting object. 2 is a schematic plan view showing an example of a physical structure of a wireless sensor module 100. FIG. 1 is a block diagram schematically showing a configuration of a setting device 200 used for setting a wireless sensor module 100. FIG. It is a figure which shows typically the setting environment of the wireless sensor module 100 by a wire communication. It is a figure which shows typically the setting environment of the wireless sensor module 100 by a radio | wireless. 5 is a flowchart for explaining a setting method of a wireless sensor module according to a preferred embodiment of the present invention. 4 is a diagram illustrating a structure of a data table 221 stored in a memory 220. FIG. It is an example of the coefficient of the conversion formula produced | generated based on the data table 221. FIG. It is a block diagram which shows roughly the structure of a wireless sensor module provided with a some sensor. It is another example of the coefficient of the conversion formula produced | generated based on the data table 221. FIG.

Explanation of symbols

100 wireless sensor module 101 sensor 101a sensor element 101b sensor circuit 110 A / D converter 120 CPU
130 Memory 131 EEPROM
141 Transmission / Reception Circuit Unit 142 Antenna 143 Input / Output Terminal 150 Battery 160 Board 190 Signal Processing Unit 200 Setting Device 210 CPU
220 Memory 221 Data Table 230 Transmission / Reception Circuit Unit 240 Antenna 250 Input / Output Terminal 300 Physical Quantity Control Area 310 Physical Quantity Change Device

Claims (11)

A method for setting a sensor module in which at least one sensor and a signal processing unit that converts a detection value of the sensor into a measurement value are integrated,
A first step of setting a physical quantity given to the sensor module to a predetermined value;
A second step of determining conversion information necessary for appropriate conversion from the detection value to the measurement value based on the detection value of the sensor obtained in the first step or a value corresponding to the detection value; ,
And a third step of storing the conversion information determined in the second step in a memory in the signal processing unit.   The sensor module setting method according to claim 1, wherein the first step is performed a plurality of times while changing the physical quantity.   The sensor module setting method according to claim 1, wherein the first step is simultaneously performed on a plurality of the sensor modules.   The sensor module setting method according to any one of claims 1 to 3, wherein the second step is executed by a setting device different from the sensor module.   The sensor module setting method according to claim 1, wherein the signal processing unit executes the second step.   6. The sensor module setting method according to claim 1, wherein the conversion information is a conversion formula for converting the detected value into the measurement value.   6. The sensor module setting method according to claim 1, wherein the conversion information is a coefficient used in a conversion formula for converting the detected value into the measurement value.   The sensor module setting method according to claim 6, wherein the conversion formula is an approximate formula.   The sensor module further includes a transmission / reception circuit unit for performing communication and a battery for supplying operating power, and the sensor, the signal processing unit, the transmission / reception circuit unit, and the battery are mounted on the same substrate. 9. The sensor module setting method according to claim 1, wherein the sensor module is set.   The sensor module setting method according to claim 9, wherein the conversion information determined in the second step is transmitted into the sensor module via the transmission / reception circuit unit. The sensor includes at least one sensor selected from the group consisting of a temperature sensor, a humidity sensor, an illuminance sensor, an acceleration sensor, a tilt sensor, a human sensor, an impact sensor, and a toner sensor. The method for setting a sensor module according to any one of claims 1 to 10.

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