Input signal detection circuit with 4G wireless communication function

Abstract

The utility model provides an input signal detection circuit with a 4G wireless communication function, which belongs to the technical field of electronic circuits and comprises a CPU (central processing unit) control circuit, a switching value detection circuit, a 4G communication circuit and an input signal detection terminal. The CPU control circuit is communicated with the 4G communication circuit through a serial port, the switching value detection circuit is communicated with the CPU control circuit, the input signal detection terminal is used for inputting a signal switching value, and the CPU control circuit is connected with the 4G communication circuit through a level conversion circuit serial port to realize transmission and reception of AT instructions. The utility model aims to solve the problem that the short circuit, open circuit and normal state of a switching value signal of a manual alarm button or an input module often need to be detected in the technical field of intelligent fire fighting of the Internet of Things, but the manual alarm button or the input module does not have a 4G communication function.

Description

Technical Field

[0001] The utility model belongs to the technical field of electronic circuits, and particularly relates to an input signal detection circuit with 4G wireless communication function. Background Technique

[0002] In modern electronic systems, the input signal detection circuit is a key component for signal reception and processing. Such circuits are usually responsible for receiving external signals, and after appropriate amplification, filtering and conversion, they provide high-quality analog or digital signals for subsequent data processing. With the diversification of electronic device functions and the improvement of performance requirements, higher standards are also put forward for the performance of the input signal detection circuit.

[0003] In the field of Internet of Things intelligent fire protection technology, it is often necessary to detect the short circuit, open circuit and normal state of the switch quantity signal of the manual alarm button or input module, but the manual alarm button or input module does not have 4G communication function. Content of the Utility Model

[0004] The purpose of the utility model is to provide an input signal detection circuit with 4G wireless communication function. The utility model aims to solve the problem that the existing manual alarm button or input module does not have 4G communication function.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] An input signal detection circuit with 4G wireless communication function is used to upload the input signal through wireless communication. It is characterized by including: a CPU control circuit, a switch quantity detection circuit, a 4G communication circuit, and an input signal detection terminal; the CPU control circuit communicates with the 4G communication circuit through a serial port, the switch quantity detection circuit communicates with the CPU control circuit, and the input signal detection terminal is used for input signal switch quantity.

[0007] As a preferred solution of the utility model, the CPU control circuit includes a chip U1, a resistor R2, a capacitor C1, and a capacitor C2. The chip U1 is electrically connected to the switch quantity detection circuit through a pin PA4. A capacitor C1 is connected in series between the pin VSS and the pin VCC of the chip U1. One end of the resistor R2 is electrically connected to the VCC end of the power supply, and the other end is electrically connected to the capacitor C2 and then grounded to GND. The pin VSS of the chip U1 is also connected to the ground GND, and the pin of the chip U1.

[0008] As a preferred solution of the present utility model, the digital quantity detection circuit includes a pin header J4 and a resistor R1. The VCC terminal of the power supply is connected to the 2nd port of the pin header J4 after being in series with the resistor R1. The 1st port of the pin header J4 is grounded to GND. The connection line between the resistor R1 and the 2nd port of the pin header J4 is also connected to the pin PA4 of the chip U1.

[0009] As a preferred solution of the present utility model, the 4G communication circuit is connected to a SIM card through an IoT card slot U5 for communication. The IoT card slot U5 is also electrically connected to a chip U4.

[0010] As a preferred solution of the present utility model, the CPU control circuit and the 4G communication circuit are connected in series through a level conversion circuit at the serial port to realize the sending and receiving of AT commands.

[0011] As a preferred solution of the present utility model, the level conversion circuit is divided into two groups. One group of the level conversion circuit is connected between the pin PA0 of the chip U1 and the RX pin of the chip U5A of the 4G communication circuit. The other group of the level conversion circuit is connected between the pin PA1 of the chip U1 and the TX pin of the chip U5A of the 4G communication circuit.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] By designing an input signal detection circuit with 4G wireless communication function, when the CPU control circuit detects the change of the digital quantity of the input signal, it communicates with the 4G communication circuit through the serial port, and uploads the real-time state of the input signal to the cloud IoT platform through the wireless communication technology of the 4G communication circuit. Description of the Drawings

[0014] The drawings are used to provide further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0015] Figure 1 It is the CPU control circuit diagram of an input signal detection circuit with 4G wireless communication function of the present utility model;

[0016] Figure 2 It is the digital quantity detection circuit diagram of an input signal detection circuit with 4G wireless communication function of the present utility model;

[0017] Figure 3 It is the 4G communication circuit diagram of an input signal detection circuit with 4G wireless communication function of the present utility model. Detailed Embodiments

[0018] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0019] Embodiment

[0020] Please refer to Figure 1 , the present utility model provides the following technical solutions:

[0021] An input signal detection circuit with 4G wireless communication function, which is used to upload the input signal through wireless communication, includes a CPU control circuit, a digital input detection circuit, a 4G communication circuit, and an input signal detection terminal; the CPU control circuit communicates with the 4G communication circuit through a serial port, the digital input detection circuit communicates with the CPU control circuit, the input signal detection terminal is used for input signal digital quantity, the digital input detection circuit is used to detect the change of the external signal, and after receiving the signal from the digital input detection circuit, the CPU control circuit processes it according to the preset program logic.

[0022] Specifically, the CPU control circuit includes chip U1, resistor R2, capacitor C1, and capacitor C2. The chip U1 is electrically connected to the digital input detection circuit through pin PA4. A capacitor C1 is connected in series between the VSS and VCC pins of the chip U1. One end of the resistor R2 is electrically connected to the VCC terminal of the power supply, and the other end is grounded through the capacitor C2. The VSS pin of the chip U1 is also connected to the ground GND. The chip U1 has a UART (Universal Asynchronous Receiver / Transmitter) interface for serial communication with external devices. The digital input detection circuit includes header J4 and resistor R1. The VCC terminal of the power supply is connected to the second pin of the header J4 through the resistor R1. The first pin of the header J4 is grounded. The connection line between the resistor R1 and the second pin of the header J4 is also connected to the pin PA4 of the chip U1. The 4G communication circuit is connected to the SIM card through the IoT card slot U5 for communication. The IoT card slot U5 is also electrically connected to the chip U4. The CPU control circuit and the 4G communication circuit are connected in series through a level conversion circuit to realize the sending and receiving of AT commands. The level conversion circuit is divided into two groups. One group of the level conversion circuit is connected between the PA0 pin of the chip U1 and the RX pin of the chip U5A of the 4G communication circuit. The other group of the level conversion circuit is connected between the PA1 pin of the chip U1 and the TX pin of the chip U5A of the 4G communication circuit. The chip U5A also provides a serial communication interface, specifically a UART interface with TTL level. At the same time, for the case where the serial communication levels of the CPU control circuit and the 4G communication circuit do not match, a level conversion circuit is also provided. The level conversion circuit allows data to be transmitted bidirectionally between the chip U1 of the CPU control circuit and the chip U5A of the 4G communication circuit.

[0023] In specific applications, when detection is performed, the digital input detection circuit detects changes in external signals. The detected signals are converted into electrical signals and transmitted to the CPU control circuit. When the CPU control circuit detects changes in the digital input signals, it communicates with the 4G module of the 4G communication circuit through the serial port, and uploads the real-time status of the input signals to the cloud IoT platform through 4G wireless communication technology.

[0024] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An input signal detection circuit with 4G wireless communication function, used to upload input signals via wireless communication, characterized in that: include: CPU control circuit, switch detection circuit, 4G communication circuit, input signal detection terminal; The CPU control circuit communicates with the 4G communication circuit via a serial port, the switch quantity detection circuit communicates with the CPU control circuit, and the input signal detection terminal is used for inputting a signal switch quantity.

2. The input signal detection circuit with 4G wireless communication function according to claim 1, characterized in that: The CPU control circuit includes a chip U1, a resistor R2, a capacitor C1, and a capacitor C2. The chip U1 is electrically connected to a switch detection circuit through a pin PA4. The capacitor C1 is connected in series between the pin VSS and the pin VCC of the chip U1. One end of the resistor R2 is electrically connected to the VCC end of the power supply, and the other end is electrically connected to the capacitor C2 and then to the ground GND. The pin VSS of the chip U1 is also connected to the ground GND. The pin of the chip U1.

3. The input signal detection circuit with 4G wireless communication function according to claim 2, characterized in that: The switch detection circuit includes a pin header J4 and a resistor R1. The VCC end of the power supply is connected in series with the resistor R1 and then connected to port 2 of the pin header J4. Port 1 of the pin header J4 is grounded GND. The connection line between the resistor R1 and port 2 of the pin header J4 is also connected to the pin PA4 of the chip U1.

4. The input signal detection circuit with 4G wireless communication function according to claim 3, characterized in that: The 4G communication circuit communicates with the SIM card through the IoT card slot U5, and the IoT card slot U5 is also electrically connected to the chip U4.

5. The input signal detection circuit with 4G wireless communication function according to claim 4, characterized in that: The CPU control circuit is connected to the 4G communication circuit via a level conversion circuit serial port to realize the sending and receiving of AT commands.

6. The input signal detection circuit with 4G wireless communication function according to claim 5, characterized in that: The level conversion circuit is divided into two groups, one group of level conversion circuits is connected between the PA0 pin of chip U1 and the RX pin of chip U5A of the 4G communication circuit, and the other group of level conversion circuits is connected between the PA1 pin of chip U1 and the TX pin of chip U5A of the 4G communication circuit.

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