Transmission circuit of integrated Internet of Things communication module

Abstract

The utility model relates to the technical field of Internet of Things communication, in particular to a transmission circuit of an integrated Internet of Things communication module, which comprises a sensor group, a signal conditioning circuit, an analog-to-digital conversion circuit, a microprocessor and a communication chip, the signal conditioning circuit is used for converting a single-end analog signal into a double-end differential analog signal, and the analog-to-digital conversion circuit is used for converting the double-end differential analog signal into a digital signal. According to the utility model, the signal conditioning circuit converts a single-end analog signal into a double-end differential analog signal, the anti-interference capability of the signal is improved, the loss of the signal in the transmission process can be effectively reduced, the signal can be ensured to be accurately received by a receiving end, and meanwhile, the signal conditioning circuit can amplify the signal, so that the signal transmission efficiency is improved. And the analog-to-digital conversion circuit converts the signals into digital signals, so that subsequent processing and sending are facilitated, and the practicability is higher.

Description

Technical Field

[0001] This utility model relates to the field of Internet of Things (IoT) communication technology, and more specifically, to the transmission circuit of an integrated IoT communication module. Background Technology

[0002] With the rapid development of IoT technology, IoT communication modules are increasingly widely used in various fields. They undertake the key tasks of data collection, transmission, and interaction, and are the core hub for realizing the interconnection of things. However, existing IoT communication module transmission circuits have many defects that urgently need to be addressed. On the one hand, the structural design of some transmission circuits is complex and redundant. Numerous electronic components and complex connection lines not only increase the manufacturing cost of the circuits but also make the circuits bulky, making it difficult to meet the needs of miniaturized and integrated devices. On the other hand, insufficient signal conversion accuracy and stability are also major problems. During the conversion between analog and digital signals, signal distortion and noise interference are prone to occur, seriously affecting the accuracy and reliability of the data.

[0003] The utility model patent with announcement number CN219244678U discloses a miniature integrated temperature, humidity, pressure and noise sensor, which includes a digital signal transceiver, a data processor connected to the digital signal transceiver, a signal amplifier connected to a temperature, humidity and atmospheric pressure acquisition unit, and an analog quantity acquisition unit connected to the signal amplifier.

[0004] Although this utility model integrates a sensor for measuring temperature, humidity, atmospheric pressure, and noise, and the overall size of the sensor is small, solving the problem of unsuitability for some environmental spaces, the signal is easily interfered with during signal transmission, resulting in inaccurate signals and failing to meet higher requirements. Utility Model Content

[0005] The purpose of this invention is to provide a transmission circuit for an integrated Internet of Things (IoT) communication module to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] The transmission circuit of the integrated Internet of Things (IoT) communication module includes a sensor group, a signal conditioning circuit, an analog-to-digital converter (ADC), a microprocessor, and a communication chip. The sensor group includes analog sensors and digital sensors. The analog sensors, the signal conditioning circuit, the ADC, and the microprocessor are electrically connected in sequence. The digital sensors are signal-connected to the microprocessor. The microprocessor and the communication chip are signal-connected. The signal conditioning circuit is used to convert single-ended analog signals into double-ended differential analog signals. The ADC is used to convert double-ended differential analog signals into digital signals.

[0008] Preferably, the signal conditioning circuit includes a +5V power supply, resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, capacitors C1, C2, C3, C4, C5, and an amplifier chip U1.

[0009] The amplifier chip U1 is model ADA4927. The first terminal of resistor R1 is connected to the output terminal of the analog sensor. The first terminal of resistor R2 is connected to the second terminal of resistor R1, and the second terminal of resistor R2 is grounded. The first terminal of resistor R3 is connected to the second terminal of resistor R1, and the second terminal of resistor R3 is connected to the +IN port of amplifier chip U1. The first terminal of resistor R4 is grounded, and the second terminal of resistor R4 is connected to the -IN port of amplifier chip U1. The first terminal of resistor R5 is connected to the +IN port of amplifier chip U1, and the second terminal of resistor R5 is connected to the -OUT port of amplifier chip U1. The first terminal of resistor R6 is connected to the -IN port of amplifier chip U1, and the second terminal of resistor R6 is connected to the +OUT port of amplifier chip U1. The first terminal of resistor R7 is connected to the PD port of amplifier chip U1, and the second terminal of resistor R7 is grounded. The first terminal of resistor R8 is connected to the output terminal of amplifier chip U1. The PD port of the amplifier chip U1 is connected to the PD port. The second end of resistor R8 is grounded. The first end of resistor R9 is connected to the -OUT port of amplifier chip U1. The first end of resistor R10 is connected to the +OUT port of amplifier chip U1. The second ends of resistor R9 and resistor R10 serve as the two output terminals of the signal conditioning circuit. The +VS port of amplifier chip U1 is connected to the +5V power supply, and the -VS port of amplifier chip U1 is grounded. The first end of capacitor C1 is connected to the +5V power supply, and the second end of capacitor C1 is grounded. The first end of capacitor C2 is connected to the +5V power supply, and the second end of capacitor C2 is grounded. The first end of capacitor C3 is grounded, and the second end of capacitor C3 is connected to the second end of resistor R9. The first end of capacitor C4 is connected to the second end of resistor R9, and the second end of capacitor C4 is connected to the second end of resistor R10. The first end of capacitor C5 is connected to the second end of resistor R10, and the second end of capacitor C5 is grounded.

[0010] Preferably, the analog-to-digital conversion circuit includes a +3.3V power supply, resistors R11 and R12, capacitors C6, C7, C8, and C9, and a conversion chip U2.

[0011] The conversion chip U2 is model AD9226. The CLK port of conversion chip U2 is connected to the clock signal ADICLK. The ports of conversion chip U2 are connected to the ports of the microprocessor. The DRVDD port of conversion chip U2 is connected to a +3.3V power supply. The AVDD and MODE ports of conversion chip U2 are connected to a +5V power supply. The DRVSS, AVSS, and REFCOM ports of conversion chip U2 are all grounded. The VINB port of conversion chip U2 is connected to the second terminal of resistor R9. The VINA port of conversion chip U2 is connected to the second terminal of resistor R10. The first terminal of capacitor C6 is connected to the CAPT port of conversion chip U2, and the second terminal of capacitor C6 is connected to the CAPB port of conversion chip U2. The first terminal of capacitor C7 is connected to the CAPT port of conversion chip U2, and the second terminal of capacitor C7 is connected to the CAPB port of conversion chip U2. The first terminal of capacitor C8 is connected to the CAPT port of conversion chip U2, and the second terminal of capacitor C8 is grounded. The first terminal of capacitor C9 is connected to the CAPB port of conversion chip U2, and the second terminal of capacitor C9 is grounded.

[0012] Preferably, the system also includes a display circuit, which is signal-connected to the microprocessor.

[0013] Preferably, an alarm circuit is also included, which includes resistors R13, R14, and R15, an indicator light L, a diode D, a transistor Q, and a buzzer BL.

[0014] The first terminal of resistor R14 is connected to the output port of the microprocessor, and the second terminal of resistor R14 is connected to the base of transistor Q. The first terminal of resistor R15 is connected to the second terminal of resistor R14, and the second terminal of resistor R15 is grounded. The first terminal of resistor R13 is connected to the +5V power supply, and the second terminal of resistor R13 is connected to the first terminal of indicator light L. The second terminal of indicator light L is connected to the collector of transistor Q, and the emitter of transistor Q is grounded. The anode of diode D is connected to the collector of transistor Q, and the cathode of diode D is connected to the +5V power supply. The first terminal of buzzer BL is connected to the +5V power supply, and the second terminal of buzzer BL is connected to the collector of transistor Q.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This invention converts a single-ended analog signal into a double-ended differential analog signal by setting a signal conditioning circuit, thereby improving the signal's anti-interference capability and effectively reducing signal loss during transmission. This ensures that the signal can be accurately received by the receiving end. At the same time, the signal conditioning circuit can amplify the signal and then convert it into a digital signal through an analog-to-digital converter circuit, which facilitates subsequent processing and transmission, making it more practical. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a circuit diagram of the signal conditioning circuit in the utility model.

[0019] Figure 3 This is a circuit diagram of the analog-to-digital converter circuit in the utility model.

[0020] Figure 4 This is a circuit diagram of the alarm circuit in the utility model.

[0021] In the picture:

[0022] 1. Sensor array; 10. Analog sensors; 11. Digital sensors;

[0023] 2. Signal conditioning circuit;

[0024] 3. Analog-to-digital converter circuit;

[0025] 4. Microprocessor;

[0026] 5. Communication chip;

[0027] 6. Display circuit;

[0028] 7. Alarm circuit. Detailed Implementation

[0029] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] Please see Figures 1-4 The present invention provides the following technical solution:

[0031] The transmission circuit of the integrated IoT communication module includes a sensor group 1, a signal conditioning circuit 2, an analog-to-digital converter 3, a microprocessor 4, and a communication chip 5. The sensor group 1 includes an analog sensor 10 and a digital sensor 11. The analog sensor 10, the signal conditioning circuit 2, the analog-to-digital converter 3, and the microprocessor 4 are electrically connected in sequence. The digital sensor 11 is signal-connected to the microprocessor 4, and the microprocessor 4 is signal-connected to the communication chip 5. The signal conditioning circuit 2 is used to convert a single-ended analog signal into a two-ended differential analog signal. The analog-to-digital converter 3 is used to convert the two-ended differential analog signal into a digital signal. The microprocessor 4 can be a common microcontroller, or other types of processors such as DSP and FPGA. The communication chip 5 can be a 4G, 5G, or WIFI module. Taking a microcontroller as an example, the microprocessor 4 and the communication chip 5 are connected through the RXD port and the TXD port.

[0032] In this embodiment, the signal conditioning circuit 2 includes a +5V power supply, resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, capacitors C1, C2, C3, C4, C5, and an amplifier chip U1.

[0033] The amplifier chip U1 is model ADA4927. The first terminal of resistor R1 is connected to the output terminal of analog sensor 10. The first terminal of resistor R2 is connected to the second terminal of resistor R1, and the second terminal of resistor R2 is grounded. The first terminal of resistor R3 is connected to the second terminal of resistor R1, and the second terminal of resistor R3 is connected to the +IN port of amplifier chip U1. The first terminal of resistor R4 is grounded, and the second terminal of resistor R4 is connected to the -IN port of amplifier chip U1. The first terminal of resistor R5 is connected to the +IN port of amplifier chip U1, and the second terminal of resistor R5 is connected to the -OUT port of amplifier chip U1. The first terminal of resistor R6 is connected to the -IN port of amplifier chip U1, and the second terminal of resistor R6 is connected to the +OUT port of amplifier chip U1. Resistor R7 has its first terminal connected to the PD port of amplifier chip U1, and its second terminal grounded. Resistor R8 has its first terminal connected to the PD port of amplifier chip U1, and its second terminal grounded. Resistor R9 has its first terminal connected to the -OUT port of amplifier chip U1, and resistor R10 has its first terminal connected to the +OUT port of amplifier chip U1. The second terminals of resistors R9 and R10 serve as the two output terminals of signal conditioning circuit 2. Amplifier chip U1's +VS port is connected to a +5V power supply, and its -VS port is grounded. Capacitor C1 has its first terminal connected to a +5V power supply, and its second terminal grounded. Capacitor C2 has its first terminal connected to a +5V power supply, and its second terminal grounded. With one terminal grounded, capacitor C3's first terminal grounded, and capacitor C3's second terminal connected to resistor R9's second terminal; capacitor C4's first terminal connected to resistor R9's second terminal, and capacitor C4's second terminal connected to resistor R10's second terminal; capacitor C5's first terminal connected to resistor R10's second terminal, and capacitor C5's second terminal grounded. A single-ended signal uses a reference ground as its base, making it susceptible to interference signals that can easily be superimposed on it. Furthermore, single-ended signals experience significant attenuation and distortion over long distances. Differential signals, on the other hand, are transmitted through two signal lines. Assuming the external interference signal is a common-mode interference, it will affect both signal lines of the differential signal simultaneously. However, because both signal lines experience the same interference... Their relative positions will not change due to this common interference, improving data accuracy. Resistors R1 and R2 are used for voltage division. Capacitors C1 and C2 are decoupling capacitors for the +5V power supply, used to filter out power supply noise and improve power supply stability. Capacitors C3, C4, and C5 are filter capacitors for the output signal, which can reduce high-frequency noise interference in the signal. Resistors R7 and R8 ground the PD port of amplifier chip U1, keeping the PD port of amplifier chip U1 at a low level, so that amplifier chip U1 is always working. When selective activation is required, resistors R7 and R8 can be changed to a branch controlled by microprocessor 4.

[0034] Specifically, the analog-to-digital conversion circuit 3 includes a +3.3V power supply, resistors R11 and R12, capacitors C6, C7, C8, and C9, and a conversion chip U2.

[0035] The conversion chip U2 is model AD9226. Its CLK port is connected to the clock signal ADICLK. The ports of conversion chip U2 correspond to the ports of microprocessor 4. The DRVDD port of conversion chip U2 is connected to a +3.3V power supply, and the AVDD and MODE ports are connected to a +5V power supply. The DRVSS, AVSS, and REFCOM ports of conversion chip U2 are all grounded. The VINB port of conversion chip U2 is connected to the second terminal of resistor R9, and the VINA port of conversion chip U2 is connected to the first terminal of resistor R10. Two terminals: the first terminal of capacitor C6 is connected to the CAPT port of converter chip U2, and the second terminal of capacitor C6 is connected to the CAPB port of converter chip U2; the first terminal of capacitor C7 is connected to the CAPT port of converter chip U2, and the second terminal of capacitor C7 is connected to the CAPB port of converter chip U2; the first terminal of capacitor C8 is connected to the CAPT port of converter chip U2, and the second terminal of capacitor C8 is grounded; the first terminal of capacitor C9 is connected to the CAPB port of converter chip U2, and the second terminal of capacitor C9 is grounded. Converter chip U2 samples and converts the input analog signal under the control of the clock signal ADICLK.

[0036] It is worth noting that the system also includes a display circuit 6, which is connected to the microprocessor 4. The display circuit 6 can use an LCD screen or a light-emitting diode screen to intuitively display the data collected by the sensor group 1, system status and other information, so that users can understand the operation of the IoT device in real time.

[0037] It is worth noting that it also includes an alarm circuit 7, which includes resistors R13, R14, and R15, an indicator light L, a diode D, a transistor Q, and a buzzer BL.

[0038] Resistor R14 is connected to the output port of microprocessor 4 at its first end and to the base of transistor Q at its second end. Resistor R15 is connected to the second end of resistor R14 at its first end and to ground at its second end. Resistor R13 is connected to the +5V power supply at its first end and to the first end of indicator light L at its second end. Indicator light L is connected to the collector of transistor Q at its second end and to ground at the emitter of transistor Q. Diode D is connected to the collector of transistor Q at its anode and to the +5V power supply at its cathode. Buzzer BL is connected to the +5V power supply at its first end and to the collector of transistor Q at its second end. Transistor Q is an NPN transistor, which can promptly issue an audible and visual alarm when an abnormality occurs, facilitating timely troubleshooting and maintenance by the user.

[0039] In use, the transmission circuit of the integrated IoT communication module of this invention allows the digital sensor 11 in sensor group 1 to directly transmit digital signals to the microprocessor 4. The analog sensor 10 in sensor group 1 typically outputs a single-ended analog signal. After amplification and conversion by the signal conditioning circuit 2, the single-ended analog signal becomes a double-ended differential analog signal, improving its anti-interference capability. In the signal conditioning circuit 2, R3=R4 and R5=R6, and the amplification factor is controlled by R3 and R5. Then, the analog signal is converted into a digital signal by the analog-to-digital converter circuit 3. After the microprocessor 4 processes the data, it can be displayed by the display circuit 6 and can also be sent through the communication chip 5. The microprocessor 4 can be set with corresponding thresholds. When abnormal data is detected, the corresponding port of the microprocessor 4 outputs a high level, the transistor Q is turned on, the buzzer BL and the indicator light L work to issue a warning. The diode D is a freewheeling diode, used to protect the transistor Q from damage caused by the reverse electromotive force generated by the inductive load of the buzzer BL. The resistor R15 provides a pull-down resistor for the base of the transistor Q to ensure that the transistor Q is in the cut-off state when there is no control signal, so as to promptly remind the user.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A transmission circuit for an integrated Internet of Things (IoT) communication module, comprising a sensor group (1), a signal conditioning circuit (2), an analog-to-digital converter (3), a microprocessor (4), and a communication chip (5), characterized in that: The sensor group (1) includes an analog sensor (10) and a digital sensor (11). The analog sensor (10), the signal conditioning circuit (2), the analog-to-digital converter (3), and the microprocessor (4) are electrically connected in sequence. The digital sensor (11) is signal-connected to the microprocessor (4). The microprocessor (4) is signal-connected to the communication chip (5). The signal conditioning circuit (2) is used to convert a single-ended analog signal into a two-ended differential analog signal. The analog-to-digital converter (3) is used to convert the two-ended differential analog signal into a digital signal.

2. The transmission circuit of the integrated Internet of Things communication module according to claim 1, characterized in that: The signal conditioning circuit (2) includes a +5V power supply, resistors R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, capacitors C1, C2, C3, C4, C5, and amplifier chip U1. The amplifier chip U1 is model ADA4927. The first end of resistor R1 is connected to the output terminal of the analog sensor (10). The first end of resistor R2 is connected to the second end of resistor R1, and the second end of resistor R2 is grounded. The first end of resistor R3 is connected to the second end of resistor R1, and the second end of resistor R3 is connected to the +IN port of amplifier chip U1. The first end of resistor R4 is grounded, and the second end of resistor R4 is connected to the -IN port of amplifier chip U1. The first end of resistor R5 is connected to the +IN port of amplifier chip U1, and the second end of resistor R5 is connected to the -OUT port of amplifier chip U1. The first end of resistor R6 is connected to the -IN port of amplifier chip U1, and the second end of resistor R6 is connected to the +OUT port of amplifier chip U1. The first end of resistor R7 is connected to the PD port of amplifier chip U1, and the second end of resistor R7 is grounded. The first end of resistor R8 is connected to the output terminal of amplifier chip U1.

1. The PD port of the amplifier chip U1 is connected to the second end of the resistor R8 and grounded. The first end of the resistor R9 is connected to the -OUT port of the amplifier chip U1 and the first end of the resistor R10 is connected to the +OUT port of the amplifier chip U1. The second ends of the resistor R9 and the second ends of the resistor R10 serve as the two output terminals of the signal conditioning circuit (2). The +VS port of the amplifier chip U1 is connected to the +5V power supply and the -VS port of the amplifier chip U1 is grounded. The first end of the capacitor C1 is connected to the +5V power supply and the second end of the capacitor C1 is grounded. The first end of the capacitor C2 is connected to the +5V power supply and the second end of the capacitor C2 is grounded. The first end of the capacitor C3 is grounded and the second end of the capacitor C3 is connected to the second end of the resistor R9. The first end of the capacitor C4 is connected to the second end of the resistor R9 and the second end of the capacitor C4 is connected to the second end of the resistor R10. The first end of the capacitor C5 is connected to the second end of the resistor R10 and the second end of the capacitor C5 is grounded.

3. The transmission circuit of the integrated Internet of Things communication module according to claim 2, characterized in that: The analog-to-digital conversion circuit (3) includes a +3.3V power supply, resistors R11 and R12, capacitors C6, C7, C8, and C9, and a conversion chip U2. The conversion chip U2 is model AD9226. The CLK port of the conversion chip U2 is connected to the clock signal ADICLK. The ports of the conversion chip U2 are connected to the ports of the microprocessor (4). The DRVDD port of the conversion chip U2 is connected to a +3.3V power supply. The AVDD port and MODE port of the conversion chip U2 are connected to a +5V power supply. The DRVSS port, AVSS port and REFCOM port of the conversion chip U2 are all grounded. The VINB port of the conversion chip U2 is connected to the second end of resistor R9. The VINA port of the conversion chip U2 is connected to the second end of resistor R10. The first end of capacitor C6 is connected to the CAPT port of the conversion chip U2. The second end of capacitor C6 is connected to the CAPB port of the conversion chip U2. The first end of capacitor C7 is connected to the CAPT port of the conversion chip U2. The second end of capacitor C7 is connected to the CAPB port of the conversion chip U2. The first end of capacitor C8 is connected to the CAPT port of the conversion chip U2. The second end of capacitor C8 is grounded. The first end of capacitor C9 is connected to the CAPB port of the conversion chip U2. The second end of capacitor C9 is grounded.

4. The transmission circuit of the integrated Internet of Things communication module according to claim 1, characterized in that: It also includes a display circuit (6), which is signal-connected to the microprocessor (4).

5. The transmission circuit of the integrated Internet of Things communication module according to claim 2, characterized in that: It also includes an alarm circuit (7), which includes resistors R13, R14, and R15, an indicator light L, a diode D, a transistor Q, and a buzzer BL; The first end of resistor R14 is connected to the output port of the microprocessor (4), the second end of resistor R14 is connected to the base of transistor Q, the first end of resistor R15 is connected to the second end of resistor R14, the second end of resistor R15 is grounded, the first end of resistor R13 is connected to the +5V power supply, the second end of resistor R13 is connected to the first end of indicator light L, the second end of indicator light L is connected to the collector of transistor Q, the emitter of transistor Q is grounded, the positive terminal of diode D is connected to the collector of transistor Q, the negative terminal of diode D is connected to the +5V power supply, the first end of buzzer BL is connected to the +5V power supply, and the second end of buzzer BL is connected to the collector of transistor Q.

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