Ultrasonic Internet of Things water meter signal tester

Abstract

The invention discloses an ultrasonic Internet of Things water meter signal tester. The tester comprises a main control module, a charging module, an NB-IOT module, a card selection module, a Bluetooth module and a key module. The input end of the main control module is electrically connected with the output end of the charging module, the output end of the main control module is electrically connected with the input ends of the NB-IOT module, the card selection module, the Bluetooth module and the key module, and the output end of the NB-IOT module is electrically connected with the input end of the card selection circuit. And the output end of the card selection circuit is connected with multiple types of Internet of Things cards. The technical problems that an existing ultrasonic internet-of-things water meter tester is poor in power storage capacity and cannot perform selection and data comparison on multiple types of internet-of-things cards at the same time are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of Internet of Things water meters, and in particular to an ultrasonic Internet of Things water meter signal tester. Background Art

[0002] With the large-scale application of NB-IOT devices in various industries, the success rate of network reporting of each device varies. Before the factory project is installed, for example, the ultrasonic IoT water meter, the installation environment needs to be tested with an NB signal tester. At present, the NB signal tester on the market has high standby power consumption and short battery life. If it is carried out, it needs to be charged twice or multiple times, which increases the user's cost of use. For example, the patent document with application number 202122287763.7 discloses an ultrasonic water meter motherboard test tooling system; the type of IoT card used by the test environment NB signal selection device, that is, when conducting telecommunications, mobile and linkage selective tests, a single-step card replacement installation selection test is required, and the IoT cards are inserted into the card slots respectively, and reported one by one. The three types of data are compared with the network quality for selection, and the use process is time-consuming and laborious; in a closed installation environment, using a handheld tester, the cover must be opened for operation, and the error of the open cover test signal is large, so the data obtained is not convincing. Therefore, it is urgent to propose an ultrasonic Internet of Things water meter signal tester to solve the technical problems that the existing ultrasonic Internet of Things water meter tester has poor power storage capacity and cannot simultaneously select and compare data of multiple types of Internet of Things cards. Summary of the invention

[0003] The main purpose of the present invention is to propose an ultrasonic Internet of Things water meter signal tester, which aims to solve the technical problems that the existing ultrasonic Internet of Things water meter tester has poor power storage capacity and cannot simultaneously select and compare data of multiple types of Internet of Things cards.

[0004] To achieve the above object, the present invention provides an ultrasonic Internet of Things water meter signal tester, wherein the ultrasonic Internet of Things water meter signal tester comprises:

[0005] A main control module, a charging module, an NB-IOT module, a card selection module, a Bluetooth module and a key module; the input end of the main control module is electrically connected to the output end of the charging module, the output end of the main control module is electrically connected to the input ends of the NB-IOT module, the card selection module, the Bluetooth module and the key module respectively, the output end of the NB-IOT module is electrically connected to the input end of the card selection circuit, and the output end of the card selection circuit is connected to multiple types of Internet of Things cards.

[0006] In one of the preferred schemes, the charging module includes a charging circuit, a power conversion circuit and a battery voltage detection circuit; one end of the charging circuit is connected to an external power supply through an interface, and the other end of the charging circuit is electrically connected to the power conversion circuit and the battery voltage detection circuit respectively, and the power conversion circuit and the battery voltage detection circuit are both electrically connected to the main control module.

[0007] In one of the preferred schemes, the charging circuit includes an interface U2; pins 2 and 11 of the interface U2 are respectively connected to the TVS tube TV1, the power supply end, the capacitor C9, the 4th pin of the battery charging management chip U3 and the resistor R9, the other end of the resistor R9 is connected to the anode of the light-emitting diode LED1, and the cathode of the light-emitting diode LED1 is connected to the 1st pin of the battery charging management chip U3; pin 5 of the battery charging management chip U3 is connected to the resistor R8, and the other ends of the resistor R8, the capacitor C9 and the TVS tube TV1 are grounded; pin 2 of the battery charging management chip U3 is respectively connected to the lithium battery and the ground end; pin 3 of the battery charging management chip U3 is respectively connected to the power conversion circuit, the battery voltage detection circuit and the lithium battery; pins 1, 12, 13, 14, 16 and 18 of the interface U2 are grounded.

[0008] One of the preferred schemes, the power conversion circuit includes a voltage regulator U4; pin 1 of the voltage regulator U4 is respectively connected to the resistor R10, the cathode of the diode D1, the cathode of the diode D2 and the capacitor C10, the other end of the resistor R10 is connected to pin 3 of the voltage regulator U4, the anode of the diode D1 is connected to the lithium battery, and the anode of the diode D2 is connected to the charging circuit; pin 5 of the voltage regulator U4 is respectively connected to the resistor R11 and the capacitor C12, the other end of the resistor R11 is respectively connected to the main control module and the capacitor C14, the pin 4 of the voltage regulator U4 is connected to the capacitor C11, and the other ends of the capacitors C11, C12, C14 and C10 are grounded.

[0009] One of the preferred schemes, the battery voltage detection circuit includes a transistor V1, a transistor V2, a resistor R12, a resistor R13, a resistor R14, a resistor R15 and a capacitor C15; the emitter of the transistor V1 is connected to the lithium battery, the base of the transistor V1 is connected to the resistor R13, the other end of the resistor R13 is connected to the collector of the transistor V2, and the base of the transistor V2 is connected to the main control module through the resistor R12; the collector of the transistor V1 is connected to the resistor R14, the other end of the resistor R14 is respectively connected to the main control module, the resistor R15 and the capacitor C15, and the emitter of the transistor V2, the resistor R15 and the other end of the capacitor C15 are grounded.

[0010] One of the preferred solutions, the card selection module includes a first card selection circuit, a second card selection circuit and a third card selection circuit; the first card selection circuit, the second card selection circuit and the third card selection circuit are electrically connected to multiple types of Internet of Things cards, a main control module and a NB-IOT module respectively.

[0011] In one of the preferred schemes, the first card selection circuit, the second card selection circuit and the third card selection circuit have the same circuit structure; the first card selection circuit includes a switch tube Q4; the gate of the switch tube Q4 is respectively connected to the resistor R33 and the resistor R34, and the other end of the resistor R34 is connected to the main control module; the source of the switch tube Q4 is respectively connected to the NB-IOT module and the other end of the resistor R33; the drain of the switch tube Q4 is connected to the first Internet of Things card.

[0012] In one of the preferred solutions, the Bluetooth module includes a Bluetooth chip U6;

[0013] Pins 8 and 9 of the Bluetooth chip U6 are connected to resistors R27 and R28 respectively, and the other ends of the resistors R27 and R28 are connected to the main control module;

[0014] Pin 14 of the Bluetooth chip U6 is respectively connected to the drain of capacitor C18 and the switch tube Q2, the gate of the switch tube Q2 is respectively connected to resistor R25 and resistor R26, the source of the switch tube Q2 is respectively connected to the other end of resistor R26 and the power supply end, the other end of the resistor R25 is connected to the main control module; Pin 15 of the Bluetooth chip and the other end of the capacitor C18 are grounded.

[0015] In one of the preferred schemes, the key module includes a key K1; pin 1 of the key K1 is respectively connected to resistor R6 and resistor R7, the other end of the resistor R6 is connected to the power supply end, and the other end of the resistor R7 is respectively connected to capacitor C8 and a main control module; pins 2, 3, and 4 of the key K1 and the other end of the capacitor C8 are grounded.

[0016] One of the preferred solutions, the ultrasonic Internet of Things water meter signal tester also includes an indicator light circuit; the input end of the indicator light circuit is connected to the output end of the main control module; the indicator light circuit includes a light-emitting diode LED2, a light-emitting diode LED3, a resistor R16 and a resistor R17; one end of the light-emitting diode LED2 is respectively connected to the light-emitting diode LED3 and the power supply end, the other end of the light-emitting diode LED2 is connected to the resistor R16, the other end of the resistor R16 is connected to the main control module, and the other end of the light-emitting diode LED3 is connected to the main control module through the resistor R17.

[0017] In the above technical solution of the present invention, the ultrasonic Internet of Things water meter signal tester includes: a main control module, a charging module, an NB-IOT module, a card selection module, a Bluetooth module and a key module; the input end of the main control module is electrically connected to the output end of the charging module, the output end of the main control module is electrically connected to the input ends of the NB-IOT module, the card selection module, the Bluetooth module and the key module respectively, the output end of the NB-IOT module is electrically connected to the input end of the card selection circuit, and the output end of the card selection circuit is connected to multiple types of Internet of Things cards. The present invention can meet the user's charging and use through the charging module, thereby improving the service life of the lithium battery. At the same time, through the terminal, such as a mobile phone, the Bluetooth module is remotely issued with control instructions, and the operation is simple. At the same time, by setting the card selection module, it can simultaneously meet the simultaneous operation of the three Internet of Things cards of Telecom, Mobile and Unicom, and obtain the comparison data of the three network types for the user to choose, solving the technical problems that the existing ultrasonic Internet of Things water meter tester has poor power storage capacity and cannot simultaneously select and compare data for multiple types of Internet of Things cards. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 This is a schematic diagram of an ultrasonic Internet of Things water meter signal tester according to an embodiment of the present invention;

[0020] Figure 2 Schematic diagram of a main control module according to an embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of a charging circuit according to an embodiment of the present invention;

[0022] Figure 4 is a schematic diagram of a power conversion circuit according to an embodiment of the present invention;

[0023] Figure 5 is a schematic diagram of a battery voltage detection circuit according to an embodiment of the present invention;

[0024] Figure 6 is a schematic diagram of a key module according to an embodiment of the present invention;

[0025] Figure 7 A schematic diagram of an indicator light circuit according to an embodiment of the present invention;

[0026] Figure 8 A schematic diagram of a download port circuit according to an embodiment of the present invention;

[0027] Fig. 9 This is a schematic diagram of an NB-IOT module according to an embodiment of the present invention;

[0028] Fig.10 A schematic diagram of a communication power supply control circuit according to an embodiment of the present invention;

[0029] Fig.11 A schematic diagram of a communication serial port conversion circuit according to an embodiment of the present invention;

[0030] Fig.12 is a schematic diagram of a first card selection circuit according to an embodiment of the present invention;

[0031] Fig.13 is a schematic diagram of a second card selection circuit according to an embodiment of the present invention;

[0032] Fig.14 is a schematic diagram of a third card selection circuit according to an embodiment of the present invention;

[0033] Fig.15 This is a schematic diagram of a first Internet of Things according to an embodiment of the present invention;

[0034] Fig.16 This is a schematic diagram of a second Internet of Things according to an embodiment of the present invention;

[0035] Fig.17 This is a schematic diagram of a third Internet of Things according to an embodiment of the present invention;

[0036] Fig.18 Schematic diagram of a Bluetooth module according to an embodiment of the present invention.

[0037] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] In addition, in the present invention, the descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0040] Furthermore, the technical solutions between the various embodiments of the present invention may be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] See also Figure 1-Figure 18 According to one aspect of the present invention, the present invention provides an ultrasonic Internet of Things water meter signal tester, wherein the ultrasonic Internet of Things water meter signal tester comprises:

[0042] A main control module, a charging module, an NB-IOT module, a card selection module, a Bluetooth module and a key module; the input end of the main control module is electrically connected to the output end of the charging module, the output end of the main control module is electrically connected to the input ends of the NB-IOT module, the card selection module, the Bluetooth module and the key module respectively, the output end of the NB-IOT module is electrically connected to the input end of the card selection circuit, and the output end of the card selection circuit is connected to multiple types of Internet of Things cards.

[0043] Specifically, in this embodiment, the charging module includes a charging circuit, a power conversion circuit and a battery voltage detection circuit; one end of the charging circuit is connected to an external power supply through an interface, and the other end of the charging circuit is electrically connected to the power conversion circuit and the battery voltage detection circuit, respectively, and the power conversion circuit and the battery voltage detection circuit are both electrically connected to the main control module.

[0044] Specifically, in this embodiment, the charging circuit includes an interface U2; pins 2 and 11 of the interface U2 are respectively connected to the TVS tube TV1, the power supply end, the capacitor C9, the 4th pin of the battery charging management chip U3 and the resistor R9, the other end of the resistor R9 is connected to the anode of the light-emitting diode LED1, and the cathode of the light-emitting diode LED1 is connected to the 1st pin of the battery charging management chip U3; the 5th pin of the battery charging management chip U3 is connected to the resistor R8, and the other ends of the resistor R8, the capacitor C9 and the TVS tube TV1 are grounded; the battery charging Pin 2 of the management chip U3 is connected to the lithium battery and the ground terminal respectively; pin 3 of the battery charging management chip U3 is connected to the power conversion circuit, the battery voltage detection circuit and the lithium battery respectively; pins 1, 12, 13, 14, 16 and 18 of the interface U2 are grounded; in the present invention, the interface U2 adopts a tape-C interface, which is not specifically limited in the present invention and can be set as needed; the charging circuit can be connected to the external power supply terminal through the tape-C interface to continuously charge the lithium battery, thereby providing power to the main control module and other functional modules.

[0045] Specifically, in this embodiment, the power conversion circuit includes a voltage regulator U4; pin 1 of the voltage regulator U4 is respectively connected to the resistor R10, the cathode of the diode D1, the cathode of the diode D2 and the capacitor C10, the other end of the resistor R10 is connected to pin 3 of the voltage regulator U4, the anode of the diode D1 is connected to the lithium battery, and the anode of the diode D2 is connected to pin 2 of the charging circuit interface U2; pin 5 of the voltage regulator U4 is respectively connected to the resistor R11 and the capacitor C12, the other end of the resistor R11 is respectively connected to the main control module and the capacitor C14, the pin 4 of the voltage regulator U4 is connected to the capacitor C11, and the capacitor C 11. The other ends of capacitors C12, C14 and C10 are grounded; the power conversion module is used to convert the energy stored in the lithium battery into the voltage required by the main control module. In the present invention, the power conversion circuit is used to convert the 5V voltage into the 3.3V voltage required by the main control module. The present invention does not make specific limitations and can be set according to needs; in the present invention, the lithium battery adopts a 505050 large-capacity lithium battery 1600mA, and the diode D1 and the diode D2 meet the user's battery when it is low on power and can be charged while using it, providing continuous power for the user to use the instrument, and the standby power consumption is designed to be uA-level current, and the standby life is more than 1 year.

[0046] Specifically, in this embodiment, the battery voltage detection circuit includes a transistor V1, a transistor V2, a resistor R12, a resistor R13, a resistor R14, a resistor R15 and a capacitor C15; the emitter of the transistor V1 is connected to the lithium battery, the base of the transistor V1 is connected to the resistor R13, the other end of the resistor R13 is connected to the collector of the transistor V2, and the base of the transistor V2 is connected to the main control module through the resistor R12; the collector of the transistor V1 is connected to the resistor R14, and the resistor R1 The other end of 4 is connected to the main control module, the resistor R15 and the capacitor C15 respectively, and the emitter of the transistor V2, the resistor R15 and the other end of the capacitor C15 are grounded; the battery voltage detection circuit is used to detect the voltage of the lithium battery to ensure that the lithium battery works within a safe range and provide corresponding signals or perform circuit protection under abnormal conditions. For example, if the power line voltage is abnormal, a signal is output to the main control module to convey the abnormal state, which can be used to judge the abnormal state or stop the instrument from running, thereby protecting the equipment and extending the battery life.

[0047] Specifically, in this embodiment, the card selection module includes a first card selection circuit, a second card selection circuit and a third card selection circuit; the first card selection circuit, the second card selection circuit and the third card selection circuit are electrically connected to multiple types of Internet of Things cards, a main control module and a NB-IOT module respectively; the present invention can realize a one-button full network access test through the first card selection circuit, the second card selection circuit and the third card selection circuit, thereby completing the synchronous test in a short time.

[0048] Specifically, in this embodiment, the first card selection circuit, the second card selection circuit and the third card selection circuit have the same circuit structure;

[0049] The first card selection circuit includes a switch tube Q4; the gate of the switch tube Q4 is connected to the resistor R33 and the resistor R34 respectively, and the other end of the resistor R34 is connected to the main control module; the source of the switch tube Q4 is connected to the NB-IOT module and the other end of the resistor R33 respectively; the drain of the switch tube Q4 is connected to the first IoT card;

[0050] The second card selection circuit includes a switch tube Q5; the gate of the switch tube Q5 is connected to the resistor R35 and the resistor R36 respectively, and the other end of the resistor R36 is connected to the main control module; the source of the switch tube Q5 is connected to the NB-IOT module and the other end of the resistor R35 respectively; the drain of the switch tube Q5 is connected to the second IoT card;

[0051] The third card selection circuit includes a switch tube Q6; the gate of the switch tube Q6 is connected to the resistor R37 and the resistor R38 respectively, and the other end of the resistor R38 is connected to the main control module; the source of the switch tube Q6 is connected to the NB-IOT module and the other end of the resistor R37 respectively; the drain of the switch tube Q6 is connected to the third IoT card;

[0052] The first IoT card, the second IoT card and the third IoT card are respectively a telecom card, a mobile card and a Unicom card. The VDD power supply of the IoT card is switched by controlling the switch tube Q4 of the first card selection circuit, the switch tube Q5 of the second card selection circuit and the switch tube Q6 of the third card selection circuit. The NB-IOT module adopts the China Mobile MN326-X. The reporting test is started with one key. The switch tube Q3 of the communication power control circuit is called, the switch tube Q4 is turned on, the switch tube Q4 and the switch tube Q6 are turned off, and the first IoT card is selected for reporting test. After the test, the module power supply of the switch tube Q3 is turned off, and the transistor V8 is turned on for load discharge to quickly drop the capacitor voltage to below 0.5V. If the voltage is 1V or above, the NB-IOT module will fail to start, turn on the switch tube Q5, turn off the switch tube Q4 and the switch tube Q6, select the second IoT card for reporting test, and the third IoT card test is similar. In order to ensure the successful reporting of the three networks in a short time, the super capacitor C14 is used for stable power supply.

[0053] Specifically, in this embodiment, the ultrasonic Internet of Things water meter signal tester also includes a communication power supply control circuit; the communication power supply control circuit is respectively connected to the NB-IOT module and the main control module; the communication power supply control circuit includes a switch tube Q3, a resistor R29 and a resistor R30; the gate of the switch tube Q3 is respectively connected to the resistor R29 and the resistor R30, the other end of the resistor R29 is respectively connected to the power supply end and the source of the switch tube Q3, the drain of the switch tube Q3 is connected to the NB-IOT module, and the other end of the resistor R30 is connected to the main control module.

[0054] Specifically, in the present embodiment, the Bluetooth module includes a Bluetooth chip U6; pins 8 and 9 of the Bluetooth chip U6 are connected to resistors R27 and R28, respectively, and the other ends of the resistors R27 and R28 are connected to the main control module; pin 14 of the Bluetooth chip U6 is connected to the drain of capacitor C18 and the switch tube Q2, respectively, the gate of the switch tube Q2 is connected to resistors R25 and R26, respectively, the source of the switch tube Q2 is connected to the other end of resistor R26 and the power supply end, respectively, and the other end of the resistor R25 is connected to the main control module; pin 15 of the Bluetooth chip and the other end of the capacitor C18 are grounded; one end of the Bluetooth module is connected to the main control module, and the other end of the Bluetooth module can be connected to an external terminal. By connecting to the Bluetooth module through an external terminal, human-machine separation can be achieved, and control instructions are issued at the terminal and data are displayed at the terminal; especially in a closed installation environment, the tester can completely simulate the actual application environment of the product by controlling the test through a Bluetooth connection.

[0055] Specifically, in this embodiment, the button module includes a button K1; pin 1 of the button K1 is respectively connected to resistor R6 and resistor R7, the other end of the resistor R6 is connected to the power supply end, and the other end of the resistor R7 is respectively connected to capacitor C8 and the main control module; pins 2, 3, and 4 of the button K1 and the other end of the capacitor C8 are grounded; the button module adopts a one-button function for easy operation. When the button duration is greater than 1s, the Bluetooth function is turned on. When the button duration is greater than 5s, the full network is reported synchronously in a short time, that is, the data of various types of Internet of Things cards are synchronously reported in a short time to ensure the real-time nature of the data.

[0056] Specifically, in this embodiment, the ultrasonic Internet of Things water meter signal tester also includes an indicator light circuit; the input end of the indicator light circuit is connected to the output end of the main control module; the indicator light circuit includes a light-emitting diode LED2, a light-emitting diode LED3, a resistor R16 and a resistor R17; one end of the light-emitting diode LED2 is respectively connected to the light-emitting diode LED3 and the power supply end, the other end of the light-emitting diode LED2 is connected to the resistor R16, the other end of the resistor R16 is connected to the main control module, and the other end of the light-emitting diode LED3 is connected to the main control module through the resistor R17; the indicator light circuit is used to indicate the running and stopping status of the tester through the light-emitting diodes LED2 and the light-emitting diodes LED3, and to monitor whether the power supply of the control circuit is normal.

[0057] Specifically, in this embodiment, the ultrasonic Internet of Things water meter signal tester also includes a download port circuit; the download port circuit is connected to the main control module, and the download port circuit includes a socket XS1, pin 1 of the socket XS1 is grounded, pin 2 of the socket XS1 is short-connected to the power supply, pin 3 of the socket XS1 is respectively connected to the resistor R5 and the main control module, pin 4 of the socket XS1 is respectively connected to the resistor R4 and the main control module, the other ends of the resistor R4 and the resistor R5 are connected to the power supply end, and pin 5 of the socket XS1 is connected to the main control module; the download port circuit is used for users to download data of the ultrasonic Internet of Things water meter signal tester.

[0058] Specifically, in this embodiment, the NB-IOT module includes module U7;

[0059] Pin 1 of the module U7 is respectively connected to the ground, the emitter of transistor V8, capacitor C19, capacitor C20 and capacitor C21, the base of the transistor V8 is connected to resistor R45, the other end of the resistor R45 is connected to the main control module, the collector of the transistor V8 is connected to resistor R31, the other end of the resistor R31 is respectively connected to capacitor C19, capacitor C20, capacitor C21 and pins 42 and 43 of the module U7; pins 11, 12 and 13 of the module U7 are respectively connected to the first IoT module. The first network card, the second Internet of Things card and the third Internet of Things card are connected; the 14 pins of the module U7 are respectively connected to the first card selection circuit, the second card selection circuit and the third card selection circuit; the 15, 17, 18, and 19 pins of the module U7 are connected to the communication serial port conversion circuit; the 24 pins of the module U7 are respectively connected to the capacitor C22 and the communication serial port conversion circuit; in the present invention, the module U7 adopts the China Mobile Internet of Things module with model MN326-X, which is not specifically limited in the present invention and can be set according to needs.

[0060] Specifically, in this embodiment, the communication serial port conversion circuit is used to realize the conversion between different serial port communication protocols, and trigger the device through a specific signal or condition to restore it to a working state;

[0061] The communication serial port conversion circuit includes transistor V5, transistor V6, transistor V7 resistor R39, resistor R40, resistor R41, resistor R42, resistor R43, diode D4 and diode D5;

[0062] The base of the transistor V5 is connected to the resistor R39, the other end of the resistor R39 is connected to the main control module, the collector of the transistor V5 is connected to the 15th pin of the module U7, and the emitter of the transistor V5 is grounded;

[0063] The base of the transistor V6 is connected to the main control module through the resistor R40, the collector of the transistor V6 is connected to the pin 19 of the module U7, and the emitter of the transistor V6 is grounded;

[0064] The base of the transistor V7 is connected to the 24th pin of the module U7 through the resistor R43, the emitter of the transistor V7 is connected to the 18th pin of the module U7, the collector of the transistor V7 is connected to the resistor R42 and the resistor R41 respectively, the other end of the resistor R42 is connected to the power supply end, and the other end of the resistor R41 is connected to the main control module;

[0065] The cathode of the diode D4 is connected to the main control module, the anode of the diode D4 is connected to the resistor R44 and the 17th pin of the module U7 respectively, the other end of the resistor R44 is connected to the cathode of the diode D5, and the anode of the diode D5 is connected to the 24th pin of the module U7.

[0066] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. An ultrasonic Internet of Things water meter signal tester, characterized in that: The following steps are involved: A main control module, a charging module, an NB-IOT module, a card selection module, a Bluetooth module and a key module; the input end of the main control module is electrically connected to the output end of the charging module, the output end of the main control module is electrically connected to the input ends of the NB-IOT module, the card selection module, the Bluetooth module and the key module respectively, the output end of the NB-IOT module is electrically connected to the input end of the card selection circuit, and the output end of the card selection circuit is connected to multiple types of Internet of Things cards.

2. The ultrasonic Internet of Things water meter signal tester according to claim 1, characterized in that: The charging module includes a charging circuit, a power conversion circuit and a battery voltage detection circuit; one end of the charging circuit is connected to an external power supply through an interface, and the other end of the charging circuit is electrically connected to the power conversion circuit and the battery voltage detection circuit respectively, and the power conversion circuit and the battery voltage detection circuit are both electrically connected to the main control module.

3. The ultrasonic Internet of Things water meter signal tester according to claim 2 is characterized in that: The charging circuit includes an interface U2; pins 2 and 11 of the interface U2 are respectively connected to the TVS tube TV1, the power supply end, the capacitor C9, the 4th pin of the battery charging management chip U3 and the resistor R9, the other end of the resistor R9 is connected to the anode of the light-emitting diode LED1, and the cathode of the light-emitting diode LED1 is connected to the 1st pin of the battery charging management chip U3; pin 5 of the battery charging management chip U3 is connected to the resistor R8, and the other ends of the resistor R8, the capacitor C9 and the TVS tube TV1 are grounded; pin 2 of the battery charging management chip U3 is respectively connected to the lithium battery and the ground end; pin 3 of the battery charging management chip U3 is respectively connected to the power conversion circuit, the battery voltage detection circuit and the lithium battery; pins 1, 12, 13, 14, 16 and 18 of the interface U2 are grounded.

4. The ultrasonic Internet of Things water meter signal tester according to claim 2, characterized in that: The power conversion circuit includes a voltage regulator U4; pin 1 of the voltage regulator U4 is respectively connected to a resistor R10, a cathode of a diode D1, a cathode of a diode D2 and a capacitor C10, the other end of the resistor R10 is connected to pin 3 of the voltage regulator U4, the anode of the diode D1 is connected to a lithium battery, and the anode of the diode D2 is connected to a charging circuit; pin 5 of the voltage regulator U4 is respectively connected to a resistor R11 and a capacitor C12, the other end of the resistor R11 is respectively connected to a main control module and a capacitor C14, pin 4 of the voltage regulator U4 is connected to a capacitor C11, and the other ends of the capacitors C11, C12, C14 and C10 are grounded.

5. The ultrasonic Internet of Things water meter signal tester according to claim 2 is characterized in that: The battery voltage detection circuit includes a transistor V1, a transistor V2, a resistor R12, a resistor R13, a resistor R14, a resistor R15 and a capacitor C15; the emitter of the transistor V1 is connected to the lithium battery, the base of the transistor V1 is connected to the resistor R13, the other end of the resistor R13 is connected to the collector of the transistor V2, and the base of the transistor V2 is connected to the main control module through the resistor R12; the collector of the transistor V1 is connected to the resistor R14, the other end of the resistor R14 is respectively connected to the main control module, the resistor R15 and the capacitor C15, and the emitter of the transistor V2, the resistor R15 and the other end of the capacitor C15 are grounded.

6. An ultrasonic Internet of Things water meter signal tester according to any one of claims 1 to 5, characterized in that: The card selection module includes a first card selection circuit, a second card selection circuit and a third card selection circuit; the first card selection circuit, the second card selection circuit and the third card selection circuit are electrically connected to multiple types of Internet of Things cards, a main control module and a NB-IOT module respectively.

7. The ultrasonic Internet of Things water meter signal tester according to claim 6, characterized in that: The first card selection circuit, the second card selection circuit and the third card selection circuit have the same circuit structure; The first card selection circuit includes a switch tube Q4; the gate of the switch tube Q4 is respectively connected to the resistor R33 and the resistor R34, and the other end of the resistor R34 is connected to the main control module; the source of the switch tube Q4 is respectively connected to the NB-IOT module and the other end of the resistor R33; the drain of the switch tube Q4 is connected to the first Internet of Things card.

8. An ultrasonic Internet of Things water meter signal tester according to any one of claims 1 to 5, characterized in that: The Bluetooth module includes a Bluetooth chip U6; Pins 8 and 9 of the Bluetooth chip U6 are connected to resistors R27 and R28 respectively, and the other ends of the resistors R27 and R28 are connected to the main control module; Pin 14 of the Bluetooth chip U6 is respectively connected to the drain of capacitor C18 and the switch tube Q2, the gate of the switch tube Q2 is respectively connected to resistor R25 and resistor R26, the source of the switch tube Q2 is respectively connected to the other end of resistor R26 and the power supply end, the other end of the resistor R25 is connected to the main control module; Pin 15 of the Bluetooth chip and the other end of the capacitor C18 are grounded.

9. An ultrasonic Internet of Things water meter signal tester according to any one of claims 1 to 5, characterized in that: The key module includes a key K1; pin 1 of the key K1 is connected to resistor R6 and resistor R7 respectively, the other end of the resistor R6 is connected to the power supply end, and the other end of the resistor R7 is connected to capacitor C8 and the main control module respectively; pins 2, 3, 4 of the key K1 and the other end of the capacitor C8 are grounded.

10. An ultrasonic Internet of Things water meter signal tester according to any one of claims 1 to 5, characterized in that: The ultrasonic Internet of Things water meter signal tester also includes an indicator light circuit; the input end of the indicator light circuit is connected to the output end of the main control module; the indicator light circuit includes a light-emitting diode LED2, a light-emitting diode LED3, a resistor R16 and a resistor R17; one end of the light-emitting diode LED2 is respectively connected to the light-emitting diode LED3 and the power supply end, the other end of the light-emitting diode LED2 is connected to the resistor R16, the other end of the resistor R16 is connected to the main control module, and the other end of the light-emitting diode LED3 is connected to the main control module through the resistor R17.

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