CN107146317B - A gate infrared detection system - Google Patents

Abstract

The invention discloses an infrared detection system for a gate. The detection system includes an infrared emitting board, an infrared receiving board, a forwarding board and a main control board. The infrared emitting board includes 4 infrared emitting tubes that emit 38kHZ infrared rays in time-sharing, and the infrared receiving board includes 4 infrared receiving tubes that receive 38kHZ infrared rays in time-sharing. The described forwarding board uses STM32 as a control chip for controlling The IO input and output interface for infrared emission and collection of infrared receiving signals, and the received infrared data is sent to the main control board through the CAN port. The entire detection cycle is controlled within 32ms. The main control board uses ARM9 as the control chip, through The algorithm detects the passing status and displays the passing status on the host computer. The detection system has less wiring, convenient installation, no need for hardware dial setting, low cost, and short detection cycle, which satisfies the real-time requirements of the gate detection system.

Description

A gate infrared detection system

technical field

The invention belongs to the technical field of infrared detection systems, in particular to an infrared detection system for gates.

Background technique

With the rapid development of urban rail transit, there is an urgent need for an automatic fare collection system to relieve the pressure of the flow of people. The gate is one of the most critical equipment in the rail transit automatic fare collection system. However, at present, my country's automatic ticket checking technology is not yet mature enough. Domestic high-speed rail and subway ticket checking systems mostly use foreign equipment or components, such as Margarita in Germany, Gulibao in Sweden, and ACE in Japan. In recent years, the demand for gate equipment in the Chinese market has been increasing. Many domestic enterprises and research institutions have conducted a lot of research work on gate technology, and the technical level is also constantly improving. However, key components and core technologies still exist. There is a large gap, and the overall technical level of turnstiles still needs to be improved.

Most of the existing gate access schemes are controlled by dial switches. When changing the access scheme, the box body toggle switch needs to be opened, which brings inconvenience to the staff and also affects the life of the equipment. At the same time, the existing gate system is not only complicated in wiring, inconvenient to install, high in cost, but also has a long response time, which makes it difficult to meet real-time requirements.

Contents of the invention

The purpose of the present invention is to provide a gate infrared detection system with less wiring, convenient installation, no need for hardware dial setting, low cost and short detection cycle, and can meet the real-time requirements of the gate detection system.

The technical solution to realize the object of the present invention is: a gate infrared detection system, including seven infrared emitting boards, seven infrared receiving boards, a forwarding board and a main control board; the infrared emitting board includes four time-sharing An infrared emitting tube emitting 38KHZ infrared rays; the infrared receiving board includes four infrared receiving tubes that receive 38KHZ infrared rays in time; the forwarding board includes an STM32 control chip for controlling infrared transmitting signals and collecting IO interfaces of infrared receiving signals , send the received infrared data to the main control board through the CAN port, and control the entire detection cycle within 32ms; the main control board includes an ARM9 control chip, which is used to detect the passing status and display the passing status on the host computer .

Further, the infrared emission board includes two signal interfaces, left and right, each signal interface includes eight control signal lines, one power line, one ground line and one 38K pulse signal line, and the numbers 1 to 4 of the left signal interface The control signal line is connected to the control signal lines No. 5-8 of the right signal interface; the control signal lines No. 5-8 of the left signal interface are connected to the control signal lines No. The control pins of the four infrared emission tubes are connected.

Further, the infrared receiving board includes two left and right signal interfaces respectively, and each signal interface includes sixteen receiving signal lines, one power supply line and one ground line, and the 1-12 receiving signal lines of the left signal interface are connected to the The receiving signal wires 5-16 of the right signal interface are connected, the receiving signal wires 13-16 of the left signal interface are floating, and the receiving signal wires 1-4 of the right signal interface are respectively connected to the four infrared receiving tubes in the infrared receiving board. The receive signal pin is connected.

Further, the installation and wiring methods of the seven infrared emitting boards are the same, and the installation and wiring methods of the seven infrared receiving boards are the same.

Further, the transmitting end of the infrared emitting board adopts the method of point-by-point emission, and the receiving end of the infrared receiving board adopts the method of synchronous detection; the 1-8 infrared emission control signals of the infrared emitting board are enabled one by one, and then detect the corresponding The receiving end of the infrared receiving board; the gate system supports up to 28 detection points, and the minimum interval between infrared emission points without interference is 8 points, so there are 4 emission tubes emitting infrared light at the same time.

Further, in the infrared emitting board, the current control signal line is allowed to be enabled for 2ms, then disabled for 2ms, and then the next control signal line is allowed to be enabled; the detection cycle of the infrared emitting board is 32ms.

Compared with the prior art, the present invention has the following remarkable advantages: (1) the system has less wiring, convenient installation, and low cost; (2) the system can select the number of gate infrared detection light curtain boards through the host computer, and determine the passage (3) The detection period of this system is short, which satisfies the real-time requirements of the gate detection system.

Description of drawings

Fig. 1 is a schematic diagram of light template control of the gate infrared detection system of the present invention.

Fig. 2 is a sequence diagram of mid-infrared detection in the present invention.

Fig. 3 is a schematic diagram of wiring inside the mid-infrared emitting board of the present invention.

Fig. 4 is a schematic block diagram of the connection of two infrared emitting boards in the present invention.

Fig. 5 is a schematic diagram of wiring inside the mid-infrared receiving board of the present invention.

Fig. 6 is a schematic block diagram of the connection of two infrared receiving boards in the present invention.

Detailed ways

The gate infrared detection system of the present invention includes seven infrared emitting boards, seven infrared receiving boards, a forwarding board and a main control board; the infrared emitting board includes four infrared emitting tubes that emit 38KHZ infrared rays in time; the described The infrared receiving board includes four infrared receiving tubes that receive 38KHZ infrared rays in time-sharing; the forwarding board includes an STM32 control chip, which is used to control the infrared emission signal and collect the IO interface of the infrared reception signal, and send the received infrared data through the CAN port Give the main control board and control the entire detection cycle within 32ms; the main control board includes an ARM9 control chip for detecting the passing status and displaying the passing status on the host computer.

Further, the infrared emission board includes two signal interfaces, left and right, each signal interface includes eight control signal lines, one power line, one ground line and one 38K pulse signal line, and the numbers 1 to 4 of the left signal interface The control signal line is connected to the control signal lines No. 5-8 of the right signal interface; the control signal lines No. 5-8 of the left signal interface are connected to the control signal lines No. The control pins of the four infrared emission tubes are connected.

Further, the infrared receiving board includes two left and right signal interfaces respectively, and each signal interface includes sixteen receiving signal lines, one power supply line and one ground line, and the 1-12 receiving signal lines of the left signal interface are connected to the The receiving signal wires 5-16 of the right signal interface are connected, the receiving signal wires 13-16 of the left signal interface are floating, and the receiving signal wires 1-4 of the right signal interface are respectively connected to the four infrared receiving tubes in the infrared receiving board. The receive signal pin is connected.

Further, the installation and wiring methods of the seven infrared emitting boards are the same, and the installation and wiring methods of the seven infrared receiving boards are the same.

Further, the transmitting end of the infrared emitting board adopts the method of point-by-point emission, and the receiving end of the infrared receiving board adopts the method of synchronous detection; the 1-8 infrared emission control signals of the infrared emitting board are enabled one by one, and then detect the corresponding The receiving end of the infrared receiving board; the gate system supports up to 28 detection points, and the minimum interval between infrared emission points without interference is 8 points, so there are 4 emission tubes emitting infrared light at the same time.

Further, in the infrared emitting board, the current control signal line is allowed to be enabled for 2ms, then disabled for 2ms, and then the next control signal line is allowed to be enabled; the detection cycle of the infrared emitting board is 32ms.

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Example 1

With reference to Figure 1, the gate infrared detection system of the present invention specifically includes seven infrared emitting boards, seven infrared receiving boards, a forwarding board and a main control board, the specific implementation is as follows:

The function of the infrared light curtain is to detect pedestrians and objects in the channel. The principle is: when no pedestrian passes by, the infrared receiving tube can receive infrared light; when a pedestrian passes by, it will block the infrared emitted by the infrared emitting tube. At this time, the infrared receiving tube cannot receive infrared light. Because the integrated infrared receiving tube does not continuously output low level when receiving infrared light, but outputs a low level pulse for a short time, and then returns to high level. Moreover, the emission angle of the infrared emitting tube is divergent. If no lens is added for optical processing, the emitted infrared light will inevitably interfere with the receiving tubes around the corresponding infrared receiving tube. Therefore, the present invention adopts the method of point-by-point transmission and synchronous detection. The detection timing is shown in Figure 2. Transmission signal 1 to transmission signal 8 send infrared signals one by one, and detect the corresponding receiving end immediately after transmission. If a low level is detected, it means that there is no occlusion here, and if a high level is detected, there is a occlusion.

The detection system needs to support up to 28 detection points, and the interval between the two points that can ensure no interference between the shooting points is 8 points, so 4 points can emit infrared signals and detect them at a time, and polling 8 times can Check all points. Therefore, the present invention designs the infrared transmitting and receiving modules respectively.

The infrared emission module includes seven infrared emission single boards and one patch board for splitting the emission signal into two. The infrared emitting single board is composed of four sets of infrared emitting tube circuits, two 18-pin connectors, a driving circuit and a decoupling circuit. The patch board that splits the transmitting signal in two is used to distribute the signal from the data forwarding board to the upper and lower two parts of the transmitting board at the same time. A connector is placed on the left and right sides of the infrared emission board, and a double-row 18-pin simple horn connector with bent pins is used.

The infrared emission board is shown in Figure 3, and IR1-IR4 represent the infrared emission tubes on the emission board, and the signal pins 1 to 8 of the connector J1 receive control signals from the data forwarding board, wherein 1-4 The signals are used to control the switches of IR1-IR4 respectively, and are respectively connected to the signal pins 5-8 of the J2 connector; the signals of J1 pins 5-8 are not used on this launch board, but are directly connected to the connector J2 Signal pins 1-4 are connected.

When the next emitting board of the infrared emitting board is connected to the current board, its schematic diagram is shown in FIG. 4 .

The infrared receiving module is composed of 7 infrared receiving boards. The infrared receiving single board is composed of four sets of infrared receiving tube circuits, two 18-pin connectors, an OR chip, a signal driving chip, and a decoupling circuit.

In the infrared receiving module, the connector J1 is located at the right end of the board and is used to connect the previous receiving tube, if it is the first board, it is used to connect the data forwarding board; the connector J2 is located at the left end of the board and is used to connect the next receiving board , if it is the last board, do not need to connect. The wiring diagram of the left and right connectors of the infrared receiving module on the receiving board is shown in FIG. 5 . IR means the infrared receiving head on the receiving board, and its detection signal is sent to the data forwarding board through the signal pin 1 to the signal pin 16 of the connector J1, and the signals of 1-4 are respectively from the signal terminals of IR1-IR4 of the receiving board .

When multiple emitting boards of the infrared receiving board are connected to the current board, its schematic diagram is shown in FIG. 6 .

The processor of the forwarding board is mainly used to control the time-sharing emission of the infrared transmitting tube, and simultaneously detect the signal of the infrared receiving tube, and send the signal to the ARM main control board. Therefore, the processor needs to have a higher main frequency and more I/O interfaces. Therefore, the forwarding board selects STM32F103RBT6 as the coprocessor.

The STM32F103RBT6 in the main control board is embedded with an 8MHz high-speed crystal oscillator, and can also be supplied with an external clock. This system uses an 8MHz external crystal oscillator for supply. The forwarding board is booted from the user flash memory, so the BOOT0 pin can be grounded through a current limiting resistor. To be on the safe side, ground BOOT1 as well. There are three 18pin simple horn connectors on the main control board, which are used for connecting cables to communicate with the channel sensors on the gate channel.

After the processing and judgment of the forwarding board, the number of the blocked sensor in the gate passage can be obtained at each sampling time. After packing these data into 4 bytes, it will be sent to the main control system through the CAN bus.

Since the voltage of the signal output by the infrared receiving module is 0-5V, and the voltage range of the input IO of the STM32 chip is 0-3.3V, it is necessary to add a level conversion chip 74ALVC164245 to the main control board, and convert the input 0- 5V voltage signal is converted to 0 ~ 3.3V.

To sum up, this system has less wiring, convenient installation, and low cost; the number of infrared detection light curtain panels of the gate can be selected through the host computer, and the passage plan can be determined without hardware dial setting; the detection cycle is short, which satisfies the needs of the gate. Real-time requirements of the detection system.

Claims (5)

1. a kind of gate infrared detection system, which is characterized in that including seven blocks of infrared emission plates, seven pieces of infrared receiver plates, one Block conversion board and one piece of master board；The infrared emission plate includes the infrared transmitting tube of four time division emission 38KHZ infrared rays； The infrared receiver plate includes the infrared receiving tube that four timesharing receive 38KHZ infrared ray；The conversion board includes a STM32 Chip is controlled, for controlling transmitting infrared emission signal and acquiring the I/O interface of received IR signal, the infrared number that will be received It is sent to master board according to by CAN mouthfuls, and by the control of entire detection cycle within 32ms；The master board includes one ARM9 controls chip, shows on host computer for detecting prevailing state, and by prevailing state；

The infrared emission plate respectively includes left and right two signaling interfaces, and each signaling interface includes eight road control signal wires, one Road power supply line, all the way ground wire and all the way 38K pulse signal-line, 1~No. 4 control signal wire and right signal interface of left signal interface 5~No. 8 control signal wires be connected；1~No. 4 control of 5~No. 8 control signal wires and right signal interface of left signal interface is believed After number line is connected, and it is connected respectively with the control pin of four infrared transmitting tubes in this infrared emission plate.

2. gate infrared detection system according to claim 1, which is characterized in that the infrared receiver plate respectively includes Left and right two signaling interfaces, each signaling interface include that 16 tunnels receive signal wire, all the way power supply line and all the way ground wire, Zuo Xin 1~No. 12 reception signal wire of number interface is connected with 5~No. 16 reception signal wires of right signal interface, left signal interface 13~ 1~No. 4 reception signal wire of No. 16 reception signal wire floatings, right signal interface connects with four in this infrared receiver plate infrared respectively The reception signal pins of closed tube are connected.

3. gate infrared detection system according to claim 1, which is characterized in that the peace of seven blocks of infrared emission plates Dress is identical with the mode of connection, and the installation of seven blocks of infrared receiver plates is identical with the mode of connection.

4. gate infrared detection system according to claim 1, which is characterized in that the transmitting terminal of the infrared emission plate Using the method emitted point by point, the receiving end of infrared receiver plate is using the synchronous method detected；1~No. 8 of infrared emission plate is red Outer emissioning controling signal enables one by one, then detects the receiving end of corresponding infrared receiver plate；This gate system could support up 28 A test point, non-interfering minimum interval is 8 points between infrared emission point, therefore has 4 transmitting tubes transmittings red simultaneously UV light.

5. gate infrared detection system according to claim 1, which is characterized in that in the infrared emission plate, currently Control signal wire allows enabled 2ms, then forbids enabled 2ms, next control signal wire allows to enable later；Infrared emission plate Detection cycle is 32ms.