CN2459719Y - Portable intelligent traffic signal lamp controller - Google Patents

Abstract

The portable intelligent traffic signal light control device is a device for traffic control and management. The "P10~P17" ports of the microcontroller are connected to the signal light drive unit, and the "P00~P07" ports are connected to the "DB0~DB7" ports of the interface circuit. P20, P26, RD, WR, ALE, REST, NTO" terminals are connected to the "AO, CS, RD, WR, CLK, REST, IRQ" terminals of the interface circuit in sequence, and the "RXD, TXD" terminals are connected to the serial The wireless communication is connected, the "OUTAO~A4, OUTBO~B4" of the interface circuit are connected with the segment driver, and the "SLO~2" of the interface circuit is connected with the decoding driver. "RLO~2" of the interface circuit is connected to the keyboard.

Description

Portable Intelligent Traffic Light Control Device

The utility model relates to the technical field of traffic control management.

The current traffic signal light control device is mainly used in the urban traffic management system, and is usually fixed at the intersection. The working time and working mode of the signal light are preset and cannot be changed at any time according to the actual situation. Therefore, its applicable occasions, The scope is limited.

The purpose of this utility model is to design a field-controllable, two-way wireless communication, portable traffic signal light control device according to the needs of traffic management in road construction, maintenance, obstacle removal and other special locations or special circumstances.

The portable intelligent traffic signal light control device of the utility model is mainly composed of a signal light drive unit, serial wireless communication, segment drive, decoding drive, keyboard, display device, single-chip microcomputer, and interface circuit. The drive unit is connected, the "P00~P07" end of the single-chip microcomputer is connected with the "DB0~DB7" end of the interface circuit, and the "P20, P26, RD, WR, ALE, REST, NTO" ends of the single-chip microcomputer respectively correspond to the interface circuit in sequence The "AO, CS, RD, WR, CLK, REST, IRQ" terminals of the microcontroller are connected, the "RXD, TXD" terminals of the single-chip microcomputer are connected with the serial wireless communication, and the "OUTAO～A4, OUTBO～B4" of the interface circuit are connected with the segment The drive is connected, and the "SLO~2" of the interface circuit is connected with the decoding drive. The "RLO~2" terminal of the interface circuit is connected to the keyboard, and the interface circuit drives 4 common cathode seven-segment LED digital tubes through the segment driver 74LS541 and the bit driver 74LS365. The serial wireless communication is composed of JF820C/JF821C wireless data transmission components. There is one set at each end. The serial communication is driven by MAX232, which is connected with the serial port TXD/RXD of 89C51. The serial output port of MAX232 is connected with the RXD, LE, BUST pins are connected, and the serial input port of MAX232 is connected to TXD, RXD, LE, IRQ pins of JF821C.

Generally speaking, the utility model is composed of single-chip microcomputers At89C51 and 8279 to form the main parts of the device, and the working time and working mode of the signal lights are set according to specific conditions, and the single-chip microcomputer completes the programming and controls the signal lights. At the same time, it can be wirelessly transmitted to another signal light control device through serial communication, so as to control traffic from both ends of the road.

The utility model has the advantages that: by adopting the patented technology, the working hours of the signal lights can be modified immediately, and there are many modes of operation (such as one-way traffic, two-way traffic, express traffic, forbidden traffic, etc.) to choose from, After the parameters are input, the microprocessor completes the internal programming, and coordinates the whole system through wireless communication and then runs automatically. Because the device uses a microprocessor unit, the core control components are stable in performance, small in size, low in cost, and easy to use, and can be operated with peripheral auxiliary facilities such as mechanical structures and power supply devices, which can generate high economic benefits and social benefits.

Fig. 1 is a block diagram of the circuit structure of the utility model. It includes a signal lamp drive unit 1, a serial wireless communication 2, a single chip microcomputer U1, an interface circuit U2, a segment drive 3, a decoding drive 4, a keyboard 5, and a display device 6.

Fig. 2 is the schematic circuit diagram of the utility model.

Embodiments of the present utility model are as follows:

The device is mainly composed of signal light drive unit 1, serial wireless communication 2, single-chip microcomputer U1, interface circuit U2, segment drive 3, decoding drive 4, keyboard 5, and display device 6, among which the single-chip microcomputer U1 and interface circuit U2 are the core The model of component microcontroller U1 is "AT89C51", and the model of interface circuit U2 is "8279". The device uses 256 bytes of RAM and 4K bytes of EPROM inside AT89C51 as data and program code storage areas, and U2 controls key input and time display. Figure 1 shows an interface method using U2 as the data memory of U1, using P20 as the decoding end of the command word or status word and data word, and writing or reading the command or status word when P20 is at a high level , when P20 is at low level, data is written or read, and U2 uses 74LS541 and 74LS365 in segment driver 3 to drive 4 common-cathode seven-segment LED digital tubes for time display, which can not only display the reset working time and working mode , and a value is displayed every second during operation to indicate the number of seconds remaining for a signal light. The wireless communication equipment is composed of JF820C/JF821C wireless data transmission components. There is one set at each end. The data input and output adopts serial communication, and the data transmission baud rate is 1200bps. Serial wireless communication 2 is driven by MAX232, which is connected with U289C51 serial port TXD/RXD, the serial output port of MAX232 is connected with RXD, LE, BUSY pins of JF820C, and the serial input port of MAX232 is connected with JF821C TXD, RXD, LE, IRQ pins. The specific control of the signal lamp is carried out by driving the power amplifier with 74LS541 through the P1 port of 89C51.

The device is designed with 12 buttons, but only 8 buttons are actually used, and the remaining 4 buttons can be used for function expansion. In Figure 1, SL0~2 are scanning lines, which are connected to the column lines of the keyboard matrix through 3~8 decoders (74LS138) (only four of them are used), and are used to scan the keyboard and act as a four-digit seven-segment LED display. Address decoding; RL0 ~ 2 for the return line. The functions of the 8 buttons are: 1. Reset button (Reset). Used to determine whether to modify the traffic light time and for system recovery; 2. Traffic light selection key (Red/Grn). When it is determined to modify, to select the type of light, the continuous key can switch between traffic lights; 3. Minute and second selection keys (Min/Sec). Determines the weight of the input time. 4. Digital selection key (Shift). Press the key continuously to determine the time position to be modified from left to right. At this time, the display of the digital tube of this position will appear in the form of flickering, which is easy to identify. 5. Numerical selection key (Num). Continuously press the key to change the value from 0 to 9 in a cycle. 6. Abort the input key (Abort). Abandon the currently modified content and use the originally set time or the default value of the system. 7. Confirm key (Return). Equivalent to the Enter key, the system runs according to the current modified value, and the locally modified time is transmitted to the signal light controller at the other end through wireless serial communication to ensure that the system runs synchronously. 8. Express key (Alert). When there is an urgent vehicle passing by or an emergency occurs, after pressing this button, the red lights at both ends of A and B will be on.

The program design of the device includes five modules: main control module, signal light control module, display module, time processing module and keyboard processing module.

(1) Main control module. When the system is powered on, first initialize the 8279, set the working mode of the keyboard to code scanning keyboard, double-key interlocking mode, set the display to the left end entry mode of 4 characters, program the 8279 clock, and clear the display RAM, FIFO/RAM content; then preset the default value in the RAM area for storing the working time of the semaphore; finally, the system runs in a cycle until the keyboard is interrupted by the default value.

(2) Signal light control module. The action process of the A and B end signal lamps is approximately regarded as a reverse order action process, as shown in Figure 6. This module can be used as a submodule called by the main module.

(3) Display module. It is used to count down the time when the red, green, and yellow lights at both ends of A and B are turned on, and to display the digits flickering during keyboard input. Since assembly language is used for decimal display, this module contains binary codes and BCD codes. conversion between.

(4) Time processing module. There are 1 second delay module, minus 1 second module and time reloading cycle module, and adopt timing interrupt mode.

(5) Keyboard processing module. For the traffic signal light controller, which is a kind of real-time instrument, it is suitable to adopt the interrupt method. Once it is found that the key is interrupted, the signal lights at both ends of AB should be processed into a red light state, and when the input working time of the traffic light is confirmed, it will restart according to the current value without returning to the point where the program was interrupted to restore the original data. Because the interrupt does not return, it is necessary to open up some units in the RAM as signs to remember the previous keystrokes for the main control program to make correct judgments and guide the control to the correct direction.

Claims (2)

1. portable intelligent traffic signals lamp control device, import by button, time showing, signal lamp control, wireless serial communication four major parts are formed, " P10～P17 " mouth that it is characterized in that single-chip microcomputer (U1) joins with signal lamp driver element (1), " P00～P07 " end of single-chip microcomputer (U1) is connected with " DB0～DB7 " end of interface circuit (U2), " the P20; P26; RD; WR; ALE; REST of single-chip microcomputer (U1), NTO " the end corresponding " AO with interface circuit (U2) of order respectively, CS, RD, WR, CLK, REST, IRQ " hold and join; the " RXD of single-chip microcomputer (U1), TXD " hold with wireless series communication (2) and join; the " OUTAO～A4 of interface circuit (U2), OUTBO～B4 " join with section driving (3); " SLO～2 " of interface circuit (U2) drive (4) with decoding and join " RLO～2 " the termination keyboards (5) of interface circuit (U2).

2. portable intelligent traffic signals lamp control device according to claim 1, it is characterized in that wireless series communication (2) is made of the JF820C/JF821C wireless data transmission component, two ends respectively have one group, serial communication is driven by MAX232, the serial port TXD/RXD of it and 89C51 links together, the serial delivery outlet of MAX232 is connected with RXD, the LE of JF820C, BUST pin, and TXD, RXD, LE, the IRQ pin of JF821C received in the serial input port of MAX232.

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