Remote wireless synchronous triggering device

Abstract

The utility model relates to the technical field of synchronous signals, in particular to a long-distance wireless synchronous triggering device. Mainly aiming at the problems that wireless communication is relatively low in reliability and relatively large in delay jitter when synchronous trigger pulse signals are transmitted in a wireless mode and convenient deployment and implementation are carried out, the following technical scheme is provided: the system comprises a sending node which comprises a first STM32 processing module and a first LoRA wireless module which is in bidirectional connection with the first STM32 processing module, a second STM32 processing module and a second LoRA wireless module which is in bidirectional connection with the second STM32 processing module; each group of receiving nodes comprises a second STM32 processing module and a second LoRA wireless module which is bidirectionally connected with the second STM32 processing module; the first single-pole double-throw key in the sending node and the second single-pole double-throw key jitter elimination module in the receiving node are connected with keys and indicator lamps. According to the utility model, through selection of a reasonable wireless communication mode, design of a communication and signal processing circuit, algorithm design and the like, the problems of high reliability, long distance and high synchronization precision of wireless communication are solved at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of synchronous signals, in particular to a long-distance wireless synchronous triggering device. Background Art

[0002] In special experimental scenarios such as missile strikes against high-altitude targets and laser high-altitude target shooting, multiple cameras are required to take photos synchronously to record the damage process in order to evaluate the damage effects. At this time, multiple cameras that are far apart are required to take photos synchronously, so a long-distance synchronous trigger device is required.

[0003] In order to achieve remote transmission of synchronous trigger signals, using wired optical fiber to transmit trigger pulse signals is a feasible method. This method has the advantage of high time synchronization accuracy, but on-site deployment is time-consuming and labor-intensive, and in some terrain conditions, it is difficult to complete wired deployment.

[0004] If wireless transmission of synchronous trigger pulse signals is adopted, it can be conveniently deployed and implemented, but wireless communication usually has the problems of low reliability and large delay jitter. In view of this, the utility model proposes a long-distance wireless synchronous trigger device. Utility Model Content

[0005] The purpose of the utility model is to propose a long-distance wireless synchronization trigger device to address the problems of low reliability and large delay jitter in wireless communication while convenient deployment and implementation of the background technology using wireless methods for synchronization trigger pulse signal transmission.

[0006] The technical solution of the utility model: a long-distance wireless synchronous trigger device, comprising a sending node, comprising a first STM32 processing module and a first LoRA wireless module bidirectionally connected thereto, the first STM32 processing module being connected with a TTL pulse input processing module, an RS485 processing module and a first single-pole double-throw button de-jittering module, the first STM32 processing module being bidirectionally connected to the RS485 processing module; multiple groups of receiving nodes, each group of receiving nodes comprising a second STM32 processing module and a second LoRA wireless module bidirectionally connected thereto, the second STM32 processing module being connected with a 5V pulse output processing module and a second single-pole double-throw button de-jittering module; the first single-pole double-throw button in the sending node and the second single-pole double-throw button de-jittering module in the receiving node are both connected with buttons and indicator lights, the two groups of buttons and indicator lights are respectively connected with the first STM32 processing module and the second STM32 processing module, and each group of buttons and indicator lights is also connected with a power management module.

[0007] Optionally, the sending node responds to the trigger signal by any one of the first single-pole double-throw button debouncing module, the RS485 processing module or the TTL pulse input processing module.

[0008] Optionally, the RS485 processing module is bidirectionally connected to a 4-core aviation plug.

[0009] Optionally, the TTL pulse input processing module is connected to a first 2-core aviation plug.

[0010] Optionally, the 5V pulse output processing module is connected to a second 2-core aviation plug, and the second 2-core aviation plug is connected to an industrial camera.

[0011] Optionally, the power management modules in the sending node and the receiving node are bidirectionally connected to batteries, and the power management modules are connected to the 220V AC power interface, and the power management modules are used to convert 220V AC power into 12V DC, 5V DC or 3.3V DC.

[0012] Compared with the prior art, the utility model has the following beneficial technical effects:

[0013] The utility model uses wireless mode instead of traditional wired wiring mode to achieve remote transmission of synchronous trigger pulses, which has the advantage of convenience. At the same time, the utility model provides a variety of trigger input modes such as button, TTL pulse input, and RS485 input, so that the system has better flexibility. The LoRA wireless module adopted by the utility model can achieve reliable transmission of 5 kilometers without obstruction. When two receiving nodes receive the synchronous pulse, the synchronization difference of the pulse is less than 1ms, which has the advantages of long distance and high synchronization accuracy.

[0014] The utility model solves the problems of high reliability, long distance and high synchronization accuracy of wireless communication at the same time by selecting reasonable wireless communication methods and designing communication and signal processing circuits, algorithm design and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A block diagram of the internal components of a wireless synchronization trigger sending node;

[0016] Figure 2 A block diagram of the internal components of a wireless synchronization trigger receiving node;

[0017] Figure 3 A circuit diagram of a first single-pole double-throw button debounce module and a second single-pole double-throw button debounce module;

[0018] Figure 4 This is the circuit diagram of the RS485 processing module;

[0019] Figure 5 This is the circuit diagram of the TTL pulse input processing module;

[0020] Figure 6 It is a circuit diagram of a first LoRA wireless module and a second LoRA wireless module;

[0021] Figure 7 is the circuit diagram of the power management module;

[0022] Figure 8 This is the circuit diagram of the 5V pulse output processing module. DETAILED DESCRIPTION

[0023] The technical solution of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all of the embodiments.

[0024] The components of the embodiments of the present invention generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0025] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Example

[0029] like Figure 1 and Figure 2 As shown, a long-distance wireless synchronous trigger device proposed by the utility model includes a sending node, including a first STM32 processing module and a first LoRA wireless module bidirectionally connected thereto. The first STM32 processing module is connected to a TTL pulse input processing module, an RS485 processing module and a first single-pole double-throw button de-jitter module, and the first STM32 processing module is bidirectionally connected to the RS485 processing module. The sending node corresponds to a trigger signal by any one of the first single-pole double-throw button de-jitter module, the RS485 processing module or the TTL pulse input processing module. The first is to generate a trigger signal by pressing a button, and the button signal is sent to the first STM32 processing module after being processed by the first single-pole double-throw button de-jitter module. After the first STM32 processing module receives the trigger signal, it controls the first LoRA wireless module to send a wireless trigger instruction data packet. The second is the trigger generation command transmitted from the external 485 bus. The RS485 processing module is bidirectionally connected to a 4-core aviation plug. The external 485 bus is connected through the 4-core aviation plug. The signal is processed by the RS485 processing module and sent to the first STM32 processing module. After the first STM32 processing module receives the trigger signal, it controls the first LoRA wireless module to send a wireless trigger instruction data packet. The third is the trigger signal transmitted from the external TTL bus. The TTL pulse input processing module is connected to the first 2-core aviation plug. The external TTL bus is connected through the first 2-core aviation plug. The signal is processed by the TTL pulse input processing module and sent to the first STM32 processing module. After the first STM32 processing module receives the trigger signal, it controls the first LoRA wireless module to send a wireless trigger instruction data packet.

[0030] Further, the trigger device also includes a receiving node, including a second STM32 processing module and a second LoRA wireless module bidirectionally connected thereto. The second STM32 processing module is connected to a 5V pulse output processing module and a second single-pole double-throw button debounce module. The second LoRA wireless module in the receiving node receives a wireless trigger instruction data packet at the air interface, and transmits the wireless trigger instruction to the second STM32 processing module through the TTL serial port. After the second STM32 processing module receives the instruction, it immediately generates a 3.3VTTL trigger pulse signal, and the 3.3VTTL pulse signal is converted into a 5V pulse signal by a 5V pulse output processing module. The 5V pulse output processing module is connected to a second 2-core aviation plug, and the second 2-core aviation plug is connected to an industrial camera. The above-mentioned 5V trigger pulse signal is output through the second 2-core aviation plug, and the industrial camera connected by the 5V pulse drive is triggered to take pictures. In the receiving node, it is also possible to directly control taking pictures by pressing a button, and the button signal is sent to the second STM32 processing module after being processed by the second single-pole double-throw button debounce module. After receiving the instruction, the second STM32 processing module immediately generates a 3.3V TTL trigger pulse signal. The 3.3V TTL pulse signal is converted into a 5V pulse signal through the 5V pulse output processing module. The 5V trigger pulse signal is output through the second 2-core aviation plug and the connected industrial camera is driven by the 5V pulse to trigger the photo.

[0031] Furthermore, the trigger device includes a first single-pole double-throw button in the sending node and a second single-pole double-throw button de-jitter module in the receiving node, and both are connected with buttons and indicator lights. Two groups of buttons and indicator lights are respectively connected with the first STM32 processing module and the second STM32 processing module, and each group of buttons and indicator lights are also connected with a power management module. The power management modules in the sending node and the receiving node are both bidirectionally connected with batteries, and the power management module is connected with a 220V mains interface. When the 220V mains is connected, the power management module is used to convert the 220V alternating current into 12V direct current, 5V direct current or 3.3V direct current, power the entire system, and charge the 12V lithium battery at the same time. When the 220V mains is not connected, the entire system is powered by the 12V lithium battery.

[0032] See also Figure 3, the circuit diagram of the first SPDT button debounce module and the second SPDT button debounce module, including a SPDT button signal debounce circuit based on RS latch and a 5V level signal to 3.3V level signal conversion circuit. The debounce circuit uses an RS latch chip IC1, the specific model is CD4043BD, to complete the signal debounce of 2 SPDT buttons. The normally open end BNO and the normally closed end BNC of the SPDT button are respectively connected to the S input and R input of the RS latch, and need to be pulled up to the 5V level through a 4.7K resistor, then the output end Q obtains the button signal BT after debounce. The two debounced key signals BT1 and BT2 are respectively sent to two level shifters IC2 and IC3, whose specific models are SN74LV1 T126DBVR. Under the power supply of 3.3V voltage, the 5V level signal is shifted down to the 3.3V level signal to obtain 3.3V key signals ANN1 and ANN2. These two signals are input to the pins of the STM32 processing chip.

[0033] See also Figure 4 , the circuit diagram of the RS485 processing module includes the RS485 interface protection circuit, the differential signal transceiver circuit supporting the RS485 standard, and the optocoupler isolation circuit. The RS485 interface protection circuit uses a PPTC self-recovery fuse and a TVS diode for protection to complete overvoltage, overcurrent, and surge protection. The specific model of the PPTC self-recovery fuse is JK250-120U, and its maximum voltage Vmax is 250V, the holding current I hold is 120mA, and the tripping current is 240mA. The specific model of the TVS diode is SMBJ12CA, and its rated working voltage VR is 12V, and the breakdown voltage VBR is 13.3V~14.7V. The differential signal transceiver IC4 completes the conversion between the RS485 differential signal end and the serial port single-end signal. The specific model of the differential signal transceiver is SN65LBC184DR. It works in half-duplex communication mode. DE is the communication direction control signal, R is the receiving signal, that is, it is transmitted from the RS485 interface to the STM32 processor, and D is the sending signal, that is, it is transmitted from the STM32 processor to the RS485 interface. The optocoupler isolation circuit completes the signal isolation and protects the circuit on the STM32 processor end. The three signal lines DE, R, and D are connected to the STM32 processor IC5, IC6, and IC7 through the isolation optocoupler. The specific model of the isolation optocoupler is PC457L0NIP0F, with a typical response speed of 1Mb / s and an input and output isolation voltage of 3.75kV.

[0034] See also Figure 5, the circuit diagram of the TTL pulse input processing module, completes the conversion of the external 5VTTL trigger pulse signal to the 3.3V pulse signal adapted to the STM32 processor, and uses the level shifter IC8 to complete the level conversion. The specific chip model is SN74LV1 T126DBVR. Under the power supply of 3.3V voltage, the external 5V signal TTL_I NPUT1 is converted into a 3.3V signal IOIN1.

[0035] See also Figure 6, the circuit diagram of the first LoRA wireless module and the second LoRA wireless module, including the LoRA wireless integrated module E22-400T30S and the output signal level conversion circuit. The integrated LoRA wireless module based on the SX1268 chip is used, the model is E22-400T30S (I C9), the module power supply range supports 3.3V ~ 5.5V, in the two commonly used typical level standards of 3.3V and 5V, the 5V level standard is selected, and the E22-400T30S module is powered by an external 5V voltage. Compared with 3.3V power supply, 5V power supply can provide greater power, thereby increasing the transmission distance. The wireless module E22-400T30S has four working modes, namely general mode (M1=0, M0=0), WOR mode (M1=0, M0=1), configuration mode (M1=1, M0=0), and sleep mode (M1=1, M0=1). The working mode is determined by the level combination of the two pins M1 and M0. The two pins are equipped with pull-up resistors and pull-down resistors in the circuit (only pull-up resistors or pull-down resistors are welded during welding). The E22-400T30S module needs to be configured in the resistance configuration mode of M1=1, M0=0 first, and configured to have a maximum transmission power of 30dBm and a minimum air rate of 2.4kbps to achieve the longest transmission distance. Then adjust the welded resistor to make it work in the general mode (M1=0, M0=0) for normal wireless transceiver communication. E22-400T30S uses TTL level serial port to communicate with STM32 processing module, including TXD signal (sent by wireless module, received by STM32 module) and RXD signal (sent by STM32 module, received by wireless module). At the same time, the wireless module also provides module working status indication signal AUX to the outside. RXD signal is directly connected to RXD pin of E22-400T30S by general IO pin of STM32. The level standard of general IO pin of STM32 is 3.3V high level, which can directly drive RXD receiving pin of E22-400T30S (under 5V power supply, the standard voltage of E22-400T30S pin is 5V). The output signals TXD and AUX of E22-400T30S are converted from 5V to 3.3V through level shifters IC10 and IC11. The specific chip model is SN74LV1 T126DBVR, the converted 3.3V level is input to the general IO pin of STM32 (STM32 module is powered by 3.3V, and the standard voltage of its IO pin is 3.3V).

[0036] See also Figure 7, Circuit diagram of the power management module, 220V mains power is processed by the AC-DC integrated conversion module and outputs 12V DC voltage, which is processed by the DC-DC power conversion circuit to generate 5V and 3.3V DC voltages, of which 5V voltage is used to power the wireless module E22-400T30S, RS485 chip SN65LBC184DR, RS latch CD4043BD, etc., and 3.3V voltage is used to power the SMT32 module, level shifter SN74LV1 T126DBVR, etc. 12V to 5V uses the switching power chip IC12, the specific model is TPS564201DDCR, 5V to 3.3V uses the LDO power chip IC13, the specific model is TPS73733DCQR.

[0037] See also Figure 8 , Circuit diagram of 5V pulse output processing module, After the wireless synchronous trigger receiving node receives the synchronous trigger command from the wireless, it generates a synchronous trigger signal TRI G, which is 3.3V. It is converted into a 5V pulse through the level driving chip IC14. The specific model of the chip is SN74HC244NSR, and the external industrial camera is driven by the 5V pulse.

[0038] In this embodiment, a one-send-multiple-receive method is adopted, including a wireless synchronization trigger sending node and several wireless synchronization trigger receiving nodes. The wireless synchronization trigger sending node sends a trigger pulse signal, and other multiple wireless synchronization trigger receiving nodes receive the trigger pulse signal at the same time to complete the synchronization trigger task. It can achieve reliable transmission of 5 kilometers without obstruction. When two receiving nodes receive the synchronization pulse, the synchronization difference of the pulse is less than 1ms, which has the advantages of long distance and high synchronization accuracy.

[0039] The above specific embodiment is only an optional embodiment of the present invention. Based on the technical solution of the present invention and the relevant inspiration of the above embodiment, those skilled in the art can make various alternative improvements and combinations to the above specific embodiment.

Claims

1. A long-distance wireless synchronization trigger device, characterized in that: include: A sending node, comprising a first STM32 processing module and a first LoRA wireless module bidirectionally connected thereto, wherein the first STM32 processing module is connected to a TTL pulse input processing module, an RS485 processing module and a first single-pole double-throw button de-jittering module, and the first STM32 processing module is bidirectionally connected to the RS485 processing module; Multiple groups of receiving nodes, each group of receiving nodes includes a second STM32 processing module and a second LoRA wireless module bidirectionally connected thereto, wherein the second STM32 processing module is connected to a 5V pulse output processing module and a second single-pole double-throw button debouncing module; The first single-pole double-throw button in the sending node and the second single-pole double-throw button de-jitter module in the receiving node are both connected with buttons and indicator lights, and the two groups of buttons and indicator lights are respectively connected with the first STM32 processing module and the second STM32 processing module, and each group of buttons and indicator lights is also connected with a power management module.

2. A long-distance wireless synchronization trigger device according to claim 1, characterized in that: The sending node responds to the trigger signal in any one of the first single-pole double-throw button debouncing module, the RS485 processing module or the TTL pulse input processing module.

3. A long-distance wireless synchronization trigger device according to claim 2, characterized in that: The RS485 processing module is bidirectionally connected to a 4-core aviation plug.

4. A long-distance wireless synchronization trigger device according to claim 3, characterized in that: The TTL pulse input processing module is connected to a first 2-core aviation plug.

5. A long-distance wireless synchronization trigger device according to claim 4, characterized in that: The 5V pulse output processing module is connected to a second 2-core aviation plug, and the second 2-core aviation plug is connected to an industrial camera.

6. A long-distance wireless synchronization trigger device according to claim 5, characterized in that: The power management modules in the sending node and the receiving node are both bidirectionally connected to batteries, and the power management modules are connected to the 220V mains interface. The power management modules are used to convert 220V AC power into 12V DC, 5V DC or 3.3V DC.

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