CN2543155Y - LED electronic bus stop signpole capable of indicaging position of vehicle - Google Patents

Abstract

The new LED electronic station sign is mainly composed of 89C52 single-chip microcomputer, shift register, crystal triode drive circuit, LED light band display part and regulated power supply. After the vehicle position information sent by the monitoring center is stored, converted, and distributed by the single-chip microcomputer, the data is distributed to each data output bit of the register in parallel by controlling multiple serial shift registers, and then the LED is driven by the driving circuit to form a The light band of the bus line shows the vehicle location information and the "last bus has passed" information on the bus line, which greatly facilitates passengers to wait for the bus, and provides important information for them to choose whether to continue waiting or transfer to other lines. The utility model also utilizes the DC power supply to drive the LED of the bus line number to emit light, which provides great convenience for passengers to find the bus station.

Description

LED electronic stop sign displaying vehicle location information

1. Technical field

The utility model relates to an electronic stop sign which uses a light-emitting diode (LED) to display vehicle position information, and is mainly used for display of the stop sign in an intelligent traffic system.

2. Background technology

Some of the existing LED electronic stop signs use LED light spots to display the location information of individual stations of vehicles, and some use LED light strips to display the location information of parts of vehicles. The disadvantage is that the amount of information provided to waiting passengers is small; in addition, all LED The electronic stop signs do not have the last bus information and the function of lighting up the bus line number with LEDs, which brings inconvenience to passengers waiting for the bus. At the same time, because the output of the shift register used in the current LED electronic station sign display circuit is mostly TTL level, the anti-interference ability is poor.

The utility model aims at the disadvantages of the existing LED electronic station signs that the amount of information provided to waiting passengers is small and there is no last bus information and bus line number, etc., and the LED light strip is used to display the whole vehicle position information, which is convenient for passengers to decide whether to continue waiting or transfer to other lines. Select, and increase the reminder of "the last bus has passed" at the same time, so as to prevent the phenomenon that the last bus has passed and passengers are still waiting. In addition, the utility model can also use the LED to light up the bus line number, so as to provide convenience for passengers to find the waiting station.

3. Contents of the invention

The LED electronic stop sign of the utility model is composed of 89C52 single-chip microcomputer as an intelligent control unit, a shift register, a crystal triode drive circuit, an LED light band display part and a voltage-stabilized power supply. The line data receiving port RXD completes the reception, and the output ports T0 and T1 of the 89C52 single-chip microcomputer are respectively connected to the corresponding SRCLK interfaces of multiple serial CMOS shift registers 74HC595, and the shift clock and data latch signals are input to the shift registers. Under the control of the signal, the output port INT0 of the 89C52 microcontroller is connected with the input port SER of the CMOS shift register 74HC595 to complete the serial input of the display information to the shift register, and distribute the data in parallel to each A data output bit port is output, and then the light band composed of LEDs is driven by the transistor drive circuit to display the vehicle position information throughout the bus line. The utility model can also drive the LED display circuit in an output level mode through an output port of the shift register to display the information of "the last train has passed". At the same time, the DC power supply filtered by the electrolytic capacitor can be used to drive the LED of the bus line number to emit light through the drive circuit, and display the information of the bus line number.

The utility model displays the vehicle position information of the whole bus line by using the LED light strip, which greatly facilitates the passengers, so that they can know the position of the bus vehicle on the waiting line when they are waiting for the bus, and can choose whether to continue waiting for the bus or transfer to other lines. The necessary information is provided. The utility model adds an LED light-emitting prompt of "the last bus has passed", which is especially convenient for passengers taking the last bus, and prevents the phenomenon that the last bus has passed and passengers are still waiting. The utility model also increases the LED light-emitting display of the bus line number, so that passengers can easily see the line number tens of meters away when they are looking for a bus stop. In circuit design, the new model adopts CMOS shift register 74HC595, which improves the anti-interference ability of the circuit.

4. Description of drawings

Figure 1 is a schematic block diagram of an LED electronic stop sign.

Figure 2 is the schematic diagram of the LED electronic station sign control and power supply part

Figure 3 is a partial electrical schematic diagram of the LED electronic station sign shift register

Figure 4 is the schematic diagram of the LED electronic station board line number display circuit

Figure 5 is a schematic diagram of the LED electronic station sign light-emitting diode drive circuit

Figure 6 is a schematic diagram of the LED electronic station sign light-emitting diode drive circuit diagram

5. Specific implementation

Example 1:

As shown in Figure 1, it is the functional block diagram of the LED electronic stop sign. The utility model is mainly composed of four parts: a control unit, a shift register, a driving circuit and a luminous display. The GPS position information received by the bus in operation is sent to the bus dispatching and monitoring center through the wireless data transmission method in the uplink direction. After real-time data processing, the location information of the bus vehicle is transmitted to the LED electronics through the wireless data broadcasting method in the downlink direction. The control unit of the stop sign, after the data entering the control unit is stored, converted, distributed, etc., it is serially output to the shift register, and the serial data is converted into parallel data through the shift register and distributed to each data output bit. Finally, the light strip composed of LEDs is driven by the driving circuit to display the vehicle position information throughout the bus line. Fig. 2 shows the electric schematic diagram of the control and power part of the utility model, the utility model adopts 89C52 single-chip microcomputer U1 as the intelligent control unit, completes the reception of the vehicle position information through the serial data receiving port RXD of the single-chip microcomputer U1, and passes through the parallel of the single-chip microcomputer The data output port INT0 (DSER) completes the output of LED display information, outputs the shift clock through T0 (CLK), and outputs the data latch signal through T1 (STB). These three data output ports jointly complete the transfer of LED display information to the shift register. send. The capacitor C1, the capacitor C2 and the crystal oscillator Q1 form an oscillation circuit, which provides a clock source for the microcontroller U1 through ports X1 and X2. The resistor R49 and the electrolytic capacitor E4 form a reset circuit, and the power-on reset function of the single-chip microcomputer U1 is completed through the RESET (RST) port. The AC 9V power supply is rectified by the 2A bridge B1, filtered by the electrolytic capacitor E1, and then output +5V DC through the three-terminal voltage regulator V1, and the +5V DC is filtered by the electrolytic capacitors E2 and E3 to provide DC for the entire circuit Power supply VCC. As shown in Figure 2, the power supply filtered by the electrolytic capacitor E1 can drive the LED of the bus line number to emit light through the NO+ and NO- ports to display the bus line number information. Figure 3 shows the electrical schematic diagram of the shift register part of the LED electronic station sign. This part is composed of 74HC595 shift registers U2~U7. U2~U7 are connected in series. The working principle is: the RCLK of the shift register U2~U7 When the (STB) port is high level, the shift register is in the data shift state, and the display data is input through the data input port SER (DSER) of the shift register U2. The shift clock is input through the SRCLK (CLK) ports of the shift registers U2~U7, and each rising edge of SRCLK (CLK) inputs one bit of data, and at the same time, the original input data is moved to the next bit, that is, O0→O1 of U2 , O1→O2,..., O6→O7, through U2's Q7 (the same data as O7) sent to the data input port SER of U3, U3's O0→O1, O1→O2,..., O6→O7, after Q7 (the same data as O7) of U3 is sent to the data input port SER of U4, ... until it is sent to O2 of U7. When a group of data is input, the data latch signal is input through the RCLK (STB) ports of the shift registers U2-U7, and the low level is active. Realize that the serial data output by the single-chip microcomputer 89C52 is distributed to each data output bit in parallel through the shift register, R1, R2, ..., R21; G1, G2, ..., G21; and then drive the LED through the transistor drive circuit. The light band shows the vehicle position information throughout the bus line. The last bit of data O2 output by the shift register U7 is the LAST signal, which drives the LED to emit light through the transistor drive circuit, and displays the message "the last train has passed". Fig. 5 shows the schematic diagram of the driving circuit of the light-emitting diode of the present invention, wherein N1 to N42 are crystal triodes 8050, and they receive the data R1, R2, ..., R21 output by the shift register; G1, G2, ... , G21; provide the driving current for LED display, drive the light band composed of light-emitting diodes L1-L21 to emit light, and display the vehicle position information throughout the bus line. Its working principle is: when the data input to the base of the transistor by the shift register is at a high level, the transistor is in the on state, and the power supply VCC provides the driving current for the LED display through the resistor and the path from the collector to the emitter of the transistor to drive the light. The diode emits light; when the data is at a low level, the transistor is in a cut-off state, its emitter has no current output, and the light-emitting diode is in a non-luminous state. The resistors R1-R42 in the circuit are current-limiting resistors, which protect the LEDs.

As shown in Figure 5, the base of the transistor N43 is connected to the O2 (LAST) signal output terminal of the shift register U7 through a resistor R43 to receive the display information of "the last train has passed" output by the shift register U7. When the O2 (LAST) signal output terminal of the shift register U7 is at a high level, that is, when the base of the transistor N43 is at a high level, the transistor N43 is in a conduction state, and the power supply VCC passes through the light-emitting diode, the resistor and the collector of the transistor to the emitter. The path of the pole provides the driving current for the LED display, drives the light-emitting diode to emit light, and displays the information of "the last bus has passed"; when the O2 (LAST) signal output terminal of the shift register U7 is at low level, the transistor is in the cut-off state, and its The emitter has no current output, the light-emitting diode is in a non-luminous state, and the message "the last train has passed" will not be displayed. The resistors R44-R48 in the circuit are current-limiting resistors, which play the role of protecting the LED, and the resistor R43 is the input resistance of the transistor N43, which plays the role of current-limiting.

As shown in Figure 4, it is the electrical schematic diagram of the LED electronic station board line number display circuit. The +5V DC power supply in Figure 2 is filtered by the electrolytic capacitor E1, and then sent to the bus line number display circuit in Figure 4 through the NO+ and NO- ports. Wherein R50, R51, ..., Rn-1, Rn, L27, L28, ..., Lm-1, n and m in Lm are determined by the number of strokes of the bus line number. Its working principle is: +5V DC at the NO+ port passes through resistors R50, R51, ..., Rn-1, Rn and light-emitting diodes L27, L28, ..., Lm-1, Lm, and reaches the negative NO- port of the power supply , forming a loop. When the +5V DC power supply is powered on, through the above circuit, the LED is driven to emit light and display the information of the bus line number. Resistors R50, R51, ..., Rn-1, Rn in the circuit are current limiting resistors, which protect the LED.

The number of used 74HC595 shift registers of the utility model is determined by the number of bus line stations. The LAST signal that controls the information display of "the last bus has passed" can be connected with the last data output bit of the shift register, and can also be connected with other data output bits of the shift register.

Claims (3)

1. the electronic stop plate that shows vehicle position information, by 89C52 single-chip microcomputer as intelligent control unit, shift register, the transistor driving circuit, LED light belt display part and stabilized voltage supply are formed, it is characterized in that: omnidistance vehicle position information is finished reception by the serial data receiving port RXD of 89C52 single-chip microcomputer, (U2～U7) corresponding SRCLK interface links to each other the delivery outlet T0 of 89C52 single-chip microcomputer with a plurality of series connection CMOS shift register 74HC595 respectively with T1, to shift register input shift clock and data latch signal, under the control of these two signals, pass through the delivery outlet INT0 of 89C52 single-chip microcomputer, link to each other with the input port SER of CMOS shift register 74HC595 (U2), finish display message to shift register (the serial input of U2～U7), (U2～U7) data parallel is assigned to each data carry-out bit port output, the light belt of forming by transistor driving circuit driving LED demonstrates the omnidistance vehicle position information of public bus network again through shift register.

2. the electronic stop plate of demonstration vehicle position information according to claim 1, it is characterized in that: last position (O2) of shift register (U7) output links to each other with the base stage of transistor (N43), drive 5 lumination of light emitting diode that are connected in parallel on transistor (N43) collector in the output level mode, demonstrate " last bus is crossed " information.

3. the electronic stop plate of demonstration vehicle position information according to claim 1 and 2 is characterized in that: through electrochemical capacitor (E1) filtered direct supply, can be directly to drive the LED of public bus network number by driving circuit luminous, demonstration public bus network information.

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