CN201819704U - Testing instrument for fridge energy efficiency experiment based on micropower wireless communication technology - Google Patents
Testing instrument for fridge energy efficiency experiment based on micropower wireless communication technology Download PDFInfo
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- CN201819704U CN201819704U CN2010205304138U CN201020530413U CN201819704U CN 201819704 U CN201819704 U CN 201819704U CN 2010205304138 U CN2010205304138 U CN 2010205304138U CN 201020530413 U CN201020530413 U CN 201020530413U CN 201819704 U CN201819704 U CN 201819704U
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Abstract
The utility model discloses a testing instrument for a fridge energy efficiency experiment based on micropower wireless communication technology, which comprises a receiving set end and at least one transmitting set end which are in wireless connection with each other, wherein the transmitting set end comprises a transmitting module and at least one sensor; the output terminal of the sensor is connected with the input terminal of the transmitting module; the receiving set end comprises a receiving module and a computer used for displaying and monitoring; and the output terminal of the receiving module is connected with the input terminal of the computer. By adopting a wireless detecting manner without the requirement of line construction, the problems of low accuracy, difficult operation, etc. existing in fridge energy efficiency detection and the like are thoroughly solved, so as to improve detection efficiency, ensure accuracy of detection data, reduce measuring error, lessen work intensity of a tester, and decrease operation difficulty. The testing instrument for the fridge energy efficiency experiment based on the micropower wireless communication technology is applied to testing of household appliances.
Description
Technical field
The utility model relates to a kind of tester, particularly a kind of refrigerator efficiency experiment tester based on the micro power radio communication technology.
Background technology
The micro power radio communication technology refers in short-range, uses open frequency range ISM, the microwave communication of point-to-point transmission mode, and its emissive power is below 100mW.
The refrigerator efficiency detects, and refers to the test of household electric refrigerator being carried out according to standard GB 12021.2-2008 " household electric refrigerator power consumption limit value and energy efficiency grade ".
This refrigerator efficiency experiment tester uses the micro power radio communication technology, and combined sensor technology and computer technology are developed a kind of new detection method, compare with the detection technique of traditional wired connection, it is with the obvious advantage: need not the construction of line, no longer be subjected to the influence of line quality, expand very conveniently, also reduced simultaneously maintenance difficulties etc.
Present stage is in the household electrical appliance testing process, basically all be to connect in wired mode, thermograph, Leakage Current and the electrical strength etc. of realization such as power input in the safety test and input current, temperature rise test, and the measuring ability of projects such as 24 hours power consumption in the efficiency test, the thermal efficiency.The detection method of wired connection is undoubtedly more satisfactory selection for the measurand of basic fixed, reached satisfied effect really in actual applications.But along with the development of radio-frequency technique, integrated circuit technique, the realization of radio communication function is more and more easier, and data rate is also more and more faster, and reaches the level that can compare favourably with wire communication gradually.And the trouble of wired connection wiring simultaneously, line fault is difficult to check, equipment layout again will rewiring, and it is outstanding all the more shortcoming such as can not arbitrarily to move, therefore people have invested communication to sight naturally, thereby some typical wireless applications have appearred, as: wireless intelligent house, radio meter register, wireless dish-order, data acquisition, wireless device management and monitoring, automobile instrument data wireless reads etc.
Radio communication can be divided into many types according to different mode classifications: can be divided into optical communication, microwave communication, sound wave communication etc. according to media; Can be divided into long distance wireless communication and short-distance wireless communication according to transmission range; Can be divided into micro power radio communication, miniwatt and high-power wireless according to emissive power communicates by letter; According to frequency range can be divided into ISM (Industrial Scientific and Medical) industrial science is communicated by letter with medical band radio, military band radio communication, the communication of aviation band radio etc.; Can be divided into controlled in wireless, voice radio communication, mass data radio communication etc. according to information transmitted; Can be divided into point-to-point, WLAN (wireless local area network), bluetooth, HomeRF, ZigBee, Wireless USB, Wi-Fi, WiMAX, UWB etc. according to consensus standard.
The micro power radio communication technology of this project research refers in short-range, uses open frequency range ISM, the microwave communication of point-to-point transmission mode, and its emissive power is below 100mW.This type of wireless communication technology is used digital signal monolithic radio frequency transceiving chip, add that microcontroller and a small amount of peripheral components constitute special use or universal wireless communication module, radio frequency chip adopts the FSK modulation system, work in ISM band, communication module generally comprises the Data Transport Protocol of simple transparent or uses simple cryptographic protocol, the user operates according to command word can realize basic data wireless transfer function, because of its power little, exploitation is widely used simply fast, data rate and flow are less, be fit to build mininet, in industry, civil area uses more.The typical chip of such wireless communication technology has: CC1000, the CC1020 of Norway Chipcon company (http://www.chipcon.com), CC2500, CC1100, CC2420, CC2430, CC2431 wireless data transceiving chip; NRF401, the nRF903 of Norway Nordic company (http://www.nvlsi.no), nRF2401, nRF905 wireless data communications transceiving chip; XE1201A, the XE1202A of Switzerland Xemics company (http://www.xemics.com), XE1203 etc.
Except the wireless communication technology of this project research, other similar typical short distance micro power radio communication technology also have: infrared technique, Bluetooth technology, 802.11b WLAN standard technology etc.The infrared light transmission information that infrared technique adopts human eye can't see, it utilizes the break-make of infrared light to represent 0-1 logic in the computing machine, and the useful effect radius is 2 meters usually, and emission angle generally is no more than 20 degree; Bluetooth technology is released jointly by companies such as Ericsson, Nokia, IBM, is mainly used in the wireless connections of communication and information equipment, and frequency of operation is 2.4GHz, and effective range is greatly in the 10m radius; 802.11b WLAN standard technology fundamental purpose provides WLAN and inserts, and also is the main technical standards of present WLAN, his frequency of operation also is 2.4GHz.Though these technology also have a lot of application, application is separately all arranged, be not suitable for being applied to the household electrical appliance context of detection.
(1), foreign study present situation
The appearance of micro power radio communication technology has caused mondial extensive concern, and what early start was studied in this respect is US military, is mainly used in sensor field.WINS (the wireless integrated network Sensors) project of subsidizing by DAR in 1996, conduct a research by University of California in Los Angeles and your research centre of Roc, target is in conjunction with MEMS technology, signal processing technology, embedded system and wireless communication technology, construct extensive, complicated integrated system, realize being connected of physical world and network world.University of California in Los Angeles has developed a wireless sensor network environment simulation system, is used for studying the problem that wireless sensor network occurs.University of Southern California has proposed to dispose the method for movable sensor node, the tree construction algorithm of gathering etc.Method and technology that Massachusetts Institute of Technology (MIT) has begun one's study and has been used for the low-consumption wireless sensor network.Colleges and universities such as Cornell University are at the singularity of network communication of wireless sensor agreement, successively proposed based on negotiation quasi-protocol, directed issue quasi-protocol, energy-sensitive quasi-protocol, multipath quasi-protocol, propagate route quasi-protocol, medium accesses control quasi-protocol, based on the agreement of cluster, data-centered new communication protocols such as routing algorithm.
(2), domestic present Research
Domestic a lot of research institution and institution of higher learning have also carried out the micro power radio communication Study on Technology.Such as scientific research institutions such as Shanghai micro-system research institute, Shenyang Institute of Automation, software study institute, calculating institute, Hefei intellectual technology researchs, universities and colleges such as Tsing-Hua University, Beijing University of Post ﹠ Telecommunication, mobile communication National Key Laboratory of Southeast China University, the National University of Defense technology, Zhejiang University also actively develop the research of wireless communication technology.The Chinese Academy of Sciences calculates institute Ningbo and divides place wireless sensor network and low power dissipation design aspect through years of researches, has developed many relevant products.The breadboard research of Beijing Jiaotong University's IP network has all proposed the thought of innovating at aspects such as basic agreement stack, Routing Protocol, network securitys.Chengdu is wireless, and imperial communication Science and Technology Ltd. also is devoted to wireless communications products exploitation, design, and its product comprises C51RF-PS, C51RF2-F, and C51RF-2 etc. comprise real-time online emulator and wireless module.
Present stage is in the household electrical appliance testing process, basically all be to connect in wired mode, thermograph, Leakage Current and the electrical strength etc. of realization such as power input in the safety test and input current, temperature rise test, and the measuring ability of projects such as 24 hours power consumption in the efficiency test, the thermal efficiency.The detection method of wired connection is undoubtedly more satisfactory selection for the measurand of basic fixed, reached satisfied effect really in actual applications.But along with the development of radio-frequency technique, integrated circuit technique, the realization of radio communication function is more and more easier, and data rate is also more and more faster, and reaches the level that can compare favourably with wire communication gradually.And the trouble of wired connection wiring simultaneously, line fault is difficult to check, equipment layout again will rewiring, and it is outstanding all the more shortcoming such as can not arbitrarily to move, therefore people have invested communication to sight naturally, thereby some typical wireless applications have appearred, as: wireless intelligent house, radio meter register, wireless dish-order, data acquisition, wireless device management and monitoring, automobile instrument data wireless reads etc.
The utility model content
In order to solve above-mentioned technical matters, the purpose of this utility model provides a kind of reliability height, practical, the refrigerator efficiency experiment tester based on the micro power radio communication technology that accuracy of detection is high and real-time.
The technical scheme that its technical matters that solves the utility model adopts is:
Refrigerator efficiency experiment tester based on the micro power radio communication technology, the receiver end and at least one transmitter end that comprise mutual wireless connections, described transmitter end comprises a transmitter module and at least one sensor, the output terminal of described sensor is connected with the input end of transmitter module, described receiver end comprises that a receiver module and is used for the computing machine of display monitoring, and the output terminal of described receiver module is connected with input end and computer.
Be further used as preferred embodiment, described transmitter module and receiver module are the CC1110 chip.
Be further used as preferred embodiment, described sensor is temperature sensor and/or humidity sensor.
Be further used as preferred embodiment, described temperature sensor is the LM92 chip.
Be further used as preferred embodiment, described humidity sensor is the SHT11 chip.
Be further used as preferred embodiment, described transmitter module also includes the FLASH chip that is used for store historical data.
Be further used as preferred embodiment, described transmitter module also comprises the liquid crystal circuit that is used to show.
The beneficial effects of the utility model are: the utility model is used the radio detection mode that need not the construction of line, thereby the household electrical appliance detection technique of the wired connection that radical change is traditional, solve up hill and dale as problems such as the low precision of aspects such as refrigerator efficiency detection existence, operating difficulties, thereby improved detection efficiency, guaranteed to detect data accuracy, reduced measuring error, alleviated detection person's working strength, manpower and materials have been saved, reduced operation easier, also provide a kind of brand-new solution simultaneously for household electrical appliance detect.
In addition, the micro power radio communication technology is as a kind of new and high technology, and its development is in the ascendant, correct understanding, grasps its mode and transport property, for better using and bringing into play the effect of radio communication in other detection range, has very strong realistic meaning.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is a system principle diagram of the present utility model;
Fig. 2 is a CC1110 inner structure block diagram of the present utility model;
Fig. 3 is a high frequency wireless module schematic diagram of the present utility model;
Fig. 4 is high frequency wireless module interface principle figure of the present utility model;
Fig. 5 is LM92 temperature probe circuit theory diagrams of the present utility model;
Fig. 6 is a humidity Acquisition Circuit schematic diagram of the present utility model;
Fig. 7 is a SHT11 inner structure block diagram of the present utility model;
Fig. 8 is power circuit principle figure of the present utility model;
Fig. 9 is a receiving end key circuit schematic diagram of the present utility model;
Figure 10 is a receiving end key circuit schematic diagram of the present utility model;
Figure 11 is a serial interface circuit schematic diagram of the present utility model;
Figure 12 is a FLASH memory circuitry schematic diagram of the present utility model;
Figure 13 is a LCD circuit schematic diagram of the present utility model;
Figure 14 is a wireless communication system block diagram of the present utility model.
Embodiment
With reference to Fig. 1, refrigerator efficiency experiment tester based on the micro power radio communication technology, the receiver end and at least one transmitter end that comprise mutual wireless connections, described transmitter end comprises a transmitter module and at least one sensor, the output terminal of described sensor is connected with the input end of transmitter module, described receiver end comprises that a receiver module and is used for the computing machine of display monitoring, and the output terminal of described receiver module is connected with input end and computer.
Be further used as preferred embodiment, described transmitter module and receiver module are the CC1110 chip.
Be further used as preferred embodiment, described sensor is temperature sensor and/or humidity sensor.
Be further used as preferred embodiment, described temperature sensor is the LM92 chip.
Be further used as preferred embodiment, described humidity sensor is the SHT11 chip.
Be further used as preferred embodiment, described transmitter module also includes the FLASH chip that is used for store historical data.
Be further used as preferred embodiment, described transmitter module also comprises the liquid crystal circuit that is used to show.
Hardware components is the basis of total system, and whether the quality of its performance can realize most important for the function of system.Aspects such as this problem has not only been considered the performance of system, has considered the saving cost simultaneously, and is easy to maintenance.This problem mainly detects temperature and humidity, by communication the temperature and humidity data transmission is arrived receiving end, is that core is organized work with temperature humidity detection and wireless transmission.The 8051MCU that wireless communication module has comprised a standard realizes functions such as temperature data acquisition and wireless transmission thus, makes system architecture simple, and is reliable and stable.Because system has adopted ripe integrated circuit, make system performance stable, maintenance workload is little, meets as the engine request that detects.
System forms theory diagram as shown in Figure 1, by the core of CC1110 communication module as system, finish the data acquisition of transmitting terminal, the temperature data that temperature sensor LM92 is measured transfers on 8051 single-chip microcomputers that CC1110 comprises by the I2C universal serial bus, read and handle according to sequential through single-chip microcomputer, again data transmission is launched to the RF radio-frequency (RF) transceiver of CC1110; After receiving end receives data,, send LCD liquid crystal display, led state to show through handling the reduction temperature data value, and send that the FLASH storer saves historical data, the RS232 interface is communicated by letter with computer real-time etc.The humidity acquisition mode is similar to temperature.
The hardware circuit design of system mainly comprises: high frequency wireless module, power circuit, temperature collection circuit, humidity Acquisition Circuit, serial line interface, FLASH storer, liquid crystal display, button and LED indication etc.
With reference to Fig. 2 CC1110 is a kind of wireless cheaply SoC, uses for low-consumption wireless and designs.This chip has comprised the 8051MCU of a standard, and a radio transmitting and receiving chip CC1110 is encapsulated in the chip of a 6mm * 6mm.8051MCU carries 32KBFlash and 4KB RAM.Radio communication operates mainly in ISM (industry, science and medical science) and SRD (short-range device) frequency band of 315/433/868/915MHz, can freely be set to 300～348MHz, 391～464MHz and 728～928MHz[31 in ISM band].
The RF radio-frequency (RF) transceiver of CC1110 is integrated highly configurable modulator-demodular unit.This detuner is supported different modulation formats, and its data transmission rate can reach 500kbps.Be integrated in forward error recovery option on the modulator-demodular unit by unlatching, performance is got a promotion.CC1110 provides hardware supported widely for processing data packets, data buffering, burst transfers of data, clear channel estimating, quality of connection indication and electromagnetic wave excites.
CC1110 is real System on Chip/SoC CMOS solution, and this solution can improve the ISM wave band and use to low cost the requirement of low-power consumption.It is in conjunction with a high-performance DSSS (direct sequence spread spectrum) radio-frequency (RF) transceiver core and small and exquisite 8051 microcontrollers efficiently of technical grade.
CC1110 uses 18 MCU (8051), RAM with 32KB flash memory able to programme and 4KB also comprises park mode timer, electrify restoration circuit (Power On Reset), power-fail detection circuit (Brown OutDetection) and 21 programmable I/O pins of analog-digital converter (ADC), timer (Timer), AES128 coprocessor, WatchDog Timer (Watchdog Timer), 32kHz crystal oscillator.
Current loss during CC1110 work is 16mA and 18mA; Speed is 1.2kBaud, and CC1110 is under reception and emission mode, and current loss is lower than 16.2mA or 16mA respectively; Speed is 2.4kBaud.The park mode of CC1110 and the characteristic that is transformed into the ultrashort time of aggressive mode are particularly suitable for those and require the very long application of battery life.，
The high frequency wireless module comprises 1 wireless singlechip CC1110,2 LED lamps, and 1 external antenna interface, 1 PCB antenna, double 20 pin emulation interface (expansion I/O) provide ISM full frequency band (315M/433M/868M/915M/2.4G) module to select, as shown in Figure 3.
The single-chip microcomputer that the high frequency wireless module comprises is the core of total system.Wherein above label one of two LED is yellow, and one below label is red, can conveniently be set to the sign of certain running status in debugging; Antenna integrated radio-frequency enabled in the high-frequency model SOC (system on a chip) independently, this antenna receiving sensitivity is more much bigger than PCB antenna, and communication distance is more than 300-800 rice; The antenna that directly adds when producing PCB is the PCB antenna, can directly use this antenna during less than 100 meters and need not connect stand-alone antenna in wireless communication distance; The high-speed clock source of system is the crystal oscillator of 26M; The low-speed clock source of system is the 32.768K crystal oscillator, can be used as house dog clock source, also can use in low-power consumption is used.20 pin interfaces as shown in Figure 4, the effect by this interface is to connect peripheral circuit, realizes data acquisition and power supply, perhaps is connected the download debugged program with emulator.
With reference to Fig. 5, LM92 is temperature sensor and the temperature window comparer that national semiconductor corp. releases, and has the I2C universal serial bus, and it is measured full accuracy and reaches ± 0.33 ℃ [32-33].LM92 window comparator structure makes design for temperature control system very convenient.As long as temperature exceeds window able to programme, the open-drain interrupt INT just becomes effectively; Temperature alarming output T_CRIT_A output can only be worked with the comparer pattern when temperature surpasses the Programmable Temperature thresholding.Master controller can the programme upper and lower bound of window of LM92 and the critical thresholding of temperature.In addition, programmable hysteresis and fault queue's function also are of great use at utmost reducing false alarm.The default thresholding that powers up of this sensor is: THYST=2 ℃, and TLOW=10 ℃, THIGH=64 ℃, T_CRIT=80 ℃.
With reference to Fig. 6, SHT11 be Switzerland Sensirion company release based on CMOSens
The novel Temperature Humidity Sensor of technology.This sensor combines CMOS chip technology and sensor technology, thereby has given play to their mutual supplement with each other's advantages effects.
The Humidity Detection utilization capacitance type structure of SHT11; and employing has " microstructure " detecting electrode systems of different protections and the electric capacity that polymer covering is formed sensor chip; except that the primary characteristic that keeps the condenser type wet sensitive device, also can resist the influence that comes from the outside.Constituted a single individuality owing to it combines temperature sensor and humidity sensor, thereby measuring accuracy is higher and can be accurate to dew point, can produce simultaneously owing to change the error that causes with thermograde between temperature and the humidity sensor.CMOSens
Technology not only combines Temperature Humidity Sensor, but also circuit such as signal amplifier, A/D converter, calibration data memory, standard I 2C bus all are integrated in the chip.The inner structure block diagram of SHT11 sensor as shown in Figure 7.
This project choice low pressure difference linearity stabilized voltage supply (LDO) TPS79533DCQ of the novel ultra-low noise of TI company and high ripple rejection ratio (PSRR), as the DC3.3V stabilized voltage supply.This series LDO peripheral circuit (as Fig. 3-8) is simple, and the PSRR under the 10kHz is up to 53dB, and noise mean square root is 33 μ V in 100Hz to the 100kHz frequency range, and maximum output current 500mA can satisfy technical requirement [35] well.
Fig. 9 and Figure 10 are the keystroke interface circuit, because number of keys is less, so adopt free-standing press-key structure.
Each button respectively connects an incoming line, thereby makes the duty of button on some lines can not influence duty on other line.The 8 bit shift register 74LS165 that five buttons are incorporated into to go here and there out by a slice insert the single-chip microcomputer of CC1110, and MISO is the serial data incoming line, provide the 74LS165 displacement required clock signal by SCK,
Control the parallel of 74LS165 inserted and the serial-shift signal wire.The method of trembling with software delay that disappears of button realizes.5 buttons are respectively wipes FLASH MKY memory key Erase, beginning/stop logger task key Start/Stop, setting key Set/Ok, upwarding key Up, down Arrow Down.5 buttons of 74LS165 connect high level by the resistance of 10K, represent to have button to press when scanning a certain position for low level.
Native system and computer serial communication need a RS232 converter to convert Transistor-Transistor Logic level to the RS232 level.Therefore adopted the SP232E of Sipex semiconductor company to carry out RS232 level conversion [36], serial ports level conversion schematic diagram is as shown in figure 11: SP232E satisfies RS-232 and serial protocol V.28 fully, have enhancement mode ESD performance, make these devices can bear ± human body discharge mode (Human Body Model) and the IEC1000-4-2 bubble-discharge pattern of 15kV.
In order to finish the function of enquiry of historical data, native system needs bigger storage space, so native system uses FLASH memory chip AT45DB081 to expand, and all image data according to time order and function in proper order, all leave in the Flash storer of expansion, in order to subsequent query, as Figure 12.AT45DB081 is that operating voltage that atmel corp releases is 2.7～3.6V, the FLASH data-carrier store of the SPI compatibility that can rewrite in system.It has the main memory capacity of 4096 pages, every page 264 byte (amounting to the 8M byte) and the SRAM data buffer of 2 264 bytes.This serial interface FLASH storer is very suitable for requiring storage density height, the pin resource occupation is few, supply voltage is low and power consumption is little commercial and industrial application.
The LM6063 module is the product that general company is opened up in Shenzhen, 128 * 64 full dot matrix stn liquid crystal modules, and built-in LCD gives birth to volt circuit, and white backlight has the brightness height, contrast height, the characteristics that wide visual angle shows.The built-in RA8802 controller of this module can built-in 512KByte the font sign indicating number, support literal and draw two kinds of mixed demonstrations, but letters such as Chinese display font (built-in simplified character library GB sign indicating number), numeric character, the Irving of Britain and Japan, the user as long as in by MCU LM6063 being write/English font sign indicating number, the just direct Chinese and English font of demonstration on the LCD panel.
More than be that preferable enforcement of the present utility model is specified, but the utility model is created and is not limited to described embodiment, those of ordinary skill in the art also can make all equivalent variations or replacement under the prerequisite of the utility model spirit, modification that these are equal to or replacement all are included in the application's claim institute restricted portion.
Claims (7)
1. based on the refrigerator efficiency experiment tester of micro power radio communication technology, it is characterized in that: the receiver end and at least one transmitter end that comprise mutual wireless connections, described transmitter end comprises a transmitter module and at least one sensor, the output terminal of described sensor is connected with the input end of transmitter module, described receiver end comprises that a receiver module and is used for the computing machine of display monitoring, and the output terminal of described receiver module is connected with input end and computer.
2. the refrigerator efficiency experiment tester based on the micro power radio communication technology according to claim 1, it is characterized in that: described transmitter module and receiver module are the CC1110 chip.
3. the refrigerator efficiency experiment tester based on the micro power radio communication technology according to claim 1, it is characterized in that: described sensor is temperature sensor and/or humidity sensor.
4. the refrigerator efficiency experiment tester based on the micro power radio communication technology according to claim 3, it is characterized in that: described temperature sensor is the LM92 chip.
5. the refrigerator efficiency experiment tester based on the micro power radio communication technology according to claim 3, it is characterized in that: described humidity sensor is the SHT11 chip.
6. the refrigerator efficiency experiment tester based on the micro power radio communication technology according to claim 2, it is characterized in that: described transmitter module also includes the FLASH chip that is used for store historical data.
7. the refrigerator efficiency experiment tester based on the micro power radio communication technology according to claim 2, it is characterized in that: described transmitter module also comprises the liquid crystal circuit that is used to show.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010205304138U CN201819704U (en) | 2010-09-14 | 2010-09-14 | Testing instrument for fridge energy efficiency experiment based on micropower wireless communication technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010205304138U CN201819704U (en) | 2010-09-14 | 2010-09-14 | Testing instrument for fridge energy efficiency experiment based on micropower wireless communication technology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103105204A (en) * | 2013-01-18 | 2013-05-15 | 中国计量学院 | Refrigerator wireless energy efficiency test system based on ZigBee technology |
| CN107395723A (en) * | 2017-07-22 | 2017-11-24 | 合肥大多数信息科技有限公司 | A kind of intelligent things chip for self-service device condition monitoring |
-
2010
- 2010-09-14 CN CN2010205304138U patent/CN201819704U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103105204A (en) * | 2013-01-18 | 2013-05-15 | 中国计量学院 | Refrigerator wireless energy efficiency test system based on ZigBee technology |
| CN107395723A (en) * | 2017-07-22 | 2017-11-24 | 合肥大多数信息科技有限公司 | A kind of intelligent things chip for self-service device condition monitoring |
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