Parking tour guide device

Abstract

The utility model relates to the technical field of parking, in particular to a parking patrol guide device, which comprises a single chip microcomputer module, a parking space detection module, a nixie tube display module, a buzzer alarm module and a power supply module, and is characterized in that the single chip microcomputer module comprises a single chip microcomputer body, a crystal oscillator unit and a reset unit; the parking space detection module is electrically connected with the single-chip microcomputer module, the parking space detection module comprises an infrared ray transmitting end, an infrared ray receiving end and a voltage comparator, the nixie tube display module is electrically connected with the single-chip microcomputer module, the nixie tube display module comprises two 8-shaped LED nixie tubes, the buzzer alarm module is electrically connected with the single-chip microcomputer module, and the buzzer alarm module is electrically connected with the single-chip microcomputer module. When the parking space is detected to be full, the single-chip microcomputer module starts the buzzer to give an alarm. The power supply module is used for connecting the device with a socket to energize the device. According to the utility model, parking tour guide is provided for the vehicle owner through the displayed lane information and parking space number information, so that the vehicle owner can quickly and effectively find the parking space.

Description

Technical Field

[0001] The utility model relates to the technical field of parking, in particular to a parking patrol device. Background Art

[0002] With the continuous growth in the number of cars, the demand for large parking lots is getting higher and higher. Large parking lots make it difficult for car owners to know where parking spaces are available. The phenomenon of circling in parking lots is extremely serious, wasting car owners' time and causing congestion in parking lots. On the other hand, there are many empty parking spaces in more remote areas but no one is interested in them, resulting in a waste of parking spaces. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a parking patrol device to solve the problem that car owners in large parking lots cannot find parking spaces quickly and effectively.

[0004] Based on the above purpose, the utility model provides a parking patrol guide device, including: a single-chip microcomputer module, a parking space detection module, a digital tube display module, a buzzer alarm module, and a power supply module, wherein:

[0005] The single chip microcomputer module includes a single chip microcomputer body, a crystal oscillator unit and a reset unit;

[0006] The parking space detection module is electrically connected to the single-chip computer module. The parking space detection module includes an infrared transmitting end, an infrared receiving end, and a voltage comparator. The negative input end of the voltage comparator is connected to the infrared receiving end, and the positive input end of the voltage comparator is connected to a sliding resistor. When the voltage at the positive input end of the voltage comparator is greater than the voltage at the negative input end, the voltage comparator outputs a high level, and the single-chip computer module determines that the parking space is occupied. When the voltage at the positive input end of the voltage comparator is less than the voltage at the negative input end, the voltage comparator outputs a low level, and the single-chip computer module determines that the parking space is vacant.

[0007] The digital tube display module is electrically connected to the single chip module, and the digital tube display module includes two "8"-shaped LED digital tubes, one of which is used to display the lane, and the other is used to display the number of parking spaces;

[0008] The buzzer alarm module is electrically connected to the single chip computer module. When it detects that the parking space is full, the single chip computer module will start the buzzer to alarm.

[0009] The power module is used to connect the device to a socket so that the device is powered on.

[0010] Optionally, the model of the single chip microcomputer body is STC89C52.

[0011] Optionally, the crystal oscillator unit is used to provide working signal pulses to the microcontroller body.

[0012] Optionally, the reset unit is used to reset and restart the single-chip microcomputer when an error occurs in the operation of the single-chip microcomputer body.

[0013] Optionally, the voltage comparator is of a model LM339.

[0014] Optionally, the LED digital tube displays lanes in the following manner:

[0015] When the two LED digital tubes on the left and the one in the middle light up, it represents the left lane;

[0016] When the middle LED digital tube lights up, it represents the middle lane;

[0017] When the two right and one middle LED digital tubes light up, it represents the right lane.

[0018] When the device is working, the parking space is detected in real time through the parking space detection module. When the voltage at the positive input terminal of the voltage comparator is greater than the voltage at the negative input terminal, the voltage comparator outputs a high level, and the single-chip computer module determines that the parking space is occupied. When the voltage at the positive input terminal of the voltage comparator is less than the voltage at the negative input terminal, the voltage comparator outputs a low level, and the single-chip computer module determines that the parking space is vacant. The judgment result is then displayed through the digital tube display module, where one LED digital tube is used to display the lane, and the other LED digital tube is used to display the number of parking spaces. The displayed lane information and parking space number information provide parking guidance for the car owner, so that the car owner can find the parking space quickly and effectively. When it is detected that the parking space is full, the single-chip computer module will start the buzzer to alarm as a warning to remind the car owner that the parking space is saturated. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a parking lot model diagram in the embodiment of the present utility model;

[0021] Figure 2 This is the pin diagram of the single chip microcomputer STC89C52 in the embodiment of the present utility model;

[0022] Figure 3 This is a schematic diagram of the single chip microcomputer module in the embodiment of the present utility model;

[0023] Figure 4This is a schematic diagram of infrared transmission and reception in an embodiment of the present utility model;

[0024] Figure 5 This is a schematic diagram of the infrared transmitting and receiving principle in the embodiment of the utility model;

[0025] Figure 6 This is a circuit diagram of a voltage comparator in an embodiment of the present utility model;

[0026] Figure 7 This is the appearance and pin diagram of the LED digital tube in the embodiment of the utility model;

[0027] Figure 8 This is the 8-segment LED digital tube structure in the embodiment of the utility model;

[0028] Figure 9 This is a buzzer alarm circuit diagram in an embodiment of the present utility model;

[0029] Figure 10 This is a schematic diagram of the power module in an embodiment of the present utility model. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0031] It should be noted that, unless otherwise defined, the technical or scientific terms used in this utility model should have the usual meanings understood by people with ordinary skills in the field to which this utility model belongs. The "first", "second" and similar words used in this utility model do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0032] like Figure 1-Figure 5 As shown, a parking patrol guide device includes: a single-chip microcomputer module, a parking space detection module, a digital tube display module, a buzzer alarm module, and a power supply module, wherein:

[0033] The single chip microcomputer module includes a single chip microcomputer body, a crystal oscillator unit and a reset unit;

[0034] The parking space detection module is electrically connected to the single-chip computer module. The parking space detection module includes an infrared transmitting end, an infrared receiving end, and a voltage comparator. The negative input end of the voltage comparator is connected to the infrared receiving end, and the positive input end of the voltage comparator is connected to a sliding resistor. When the voltage at the positive input end of the voltage comparator is greater than the voltage at the negative input end, the voltage comparator outputs a high level, and the single-chip computer module determines that the parking space is occupied. When the voltage at the positive input end of the voltage comparator is less than the voltage at the negative input end, the voltage comparator outputs a low level, and the single-chip computer module determines that the parking space is vacant.

[0035] The digital tube display module is electrically connected to the single chip module, and the digital tube display module includes two "8"-shaped LED digital tubes, one of which is used to display the lane, and the other is used to display the number of parking spaces;

[0036] The buzzer alarm module is electrically connected to the single-chip computer module. When it detects that the parking space is full, the single-chip computer module will start the buzzer to alarm;

[0037] The power module is used to connect the device to a socket so that the device is powered on.

[0038] When the device is working, the parking space is detected in real time through the parking space detection module. When the voltage at the positive input terminal of the voltage comparator is greater than the voltage at the negative input terminal, the voltage comparator outputs a high level, and the single-chip computer module determines that the parking space is occupied. When the voltage at the positive input terminal of the voltage comparator is less than the voltage at the negative input terminal, the voltage comparator outputs a low level, and the single-chip computer module determines that the parking space is vacant. The judgment result is then displayed through the digital tube display module, where one LED digital tube is used to display the lane, and the other LED digital tube is used to display the number of parking spaces. The displayed lane information and parking space number information provide parking guidance for the car owner, so that the car owner can find the parking space quickly and effectively. When it is detected that the parking space is full, the single-chip computer module will start the buzzer to alarm as a warning to remind the car owner that the parking space is saturated.

[0039] like Figure 2-Figure 3 As shown, in some embodiments, the model of the single chip microcomputer body is STC89C52. STC89C52 pin description:

[0040] VCC (40 pin): power supply voltage

[0041] VSS (20 pin): Ground

[0042] Port 0: Port 0 is an 8-bit open-drain, bidirectional I / O port. As an output port, each bit can drive 8 TTL logic levels. Writing a "1" to port 0 acts as a high-impedance input. Port 0 also multiplexes the lower 8 bits of address / data when accessing external program and data memory. In this mode, port 0 has an internal pull-up resistor. Port 0 is also used to receive instruction bytes during flash programming and output instruction bytes during program verification. External pull-up resistors are required for program verification.

[0043] Port 1: Port 1 is an 8-bit bidirectional I / O port with internal pull-up resistors. The output buffer of port 1 is capable of driving four TTL logic levels. When a "1" is written to port 1, the internal pull-up resistor pulls the port high, making it usable as an input. When used as an input, a pin pulled low externally will output current (IIL) due to the internal resistor.

[0044] In addition, P1.0 and P1.2 are used as the external count input (P1.0 / T2) and trigger input (P1.1 / T2EX) of Timer / Counter 2, respectively, as shown in the table below. During flash programming and verification, port P1 receives the lower 8 bits of the address byte.

[0045] Table 2-1 P1.0 and P1.1 pin multiplexing functions

[0046]

[0047] Pin number second function

[0048] P1.0 T2 (external count input of timer / counter T2), clock output

[0049] P1.1 T2EX (capture / reload trigger signal and direction control of timer / counter T2)

[0050] P1.5 MOSI (for online system programming)

[0051] P1.6 MISO (for online system programming)

[0052] P1.7 SCK (for online system programming)

[0053] Port 2: Port 2 is an 8-bit bidirectional I / O port with internal pull-up resistors. The P2 output buffer can drive four TTL logic levels. When a "1" is written to the P2 port, the internal pull-up resistor pulls the port high, making it usable as an input. When used as an input, a pin pulled low externally will output current (IIL) due to the internal resistor.

[0054] When accessing external program memory or reading external data memory using a 16-bit address (for example, executing MOVX@DPTR), port P2 sends the upper eight bits of the address. In this application, port P2 uses a strong internal pull-up to transmit a 1. When accessing external data memory using an 8-bit address (for example, MOVX@RI), port P2 outputs the contents of the P2 latch. Port P2 also receives the upper eight bits of the address byte and some control signals during flash programming and verification.

[0055] Port 3: Port 3 is an 8-bit bidirectional I / O port with internal pull-up resistors. The P3 output buffer can drive four TTL logic levels. When a "1" is written to the P3 port, the internal pull-up resistor pulls the port high, making it usable as an input. When used as an input, a pin pulled low externally will output current (IIL) due to the internal resistor. Port 3 also serves as a special function (secondary function) of the STC89C52, as shown in the table below. Port 3 also receives control signals during flash programming and verification.

[0056] In addition to being a general I / O port, the P3 port also has other multiplexing functions:

[0057] Table 2-2P3 port pin multiplexing function

[0058]

[0059] RST——Reset input. When the oscillator is working, a high level of more than two machine cycles on the RST pin will reset the microcontroller.

[0060] ALE / PROG - When accessing external program memory or data memory, the ALE (Address Latch Enable) output pulse latches the lower 8 bits of the address. Normally, ALE still outputs a fixed pulse signal at 1 / 6 the clock oscillator frequency, so it can be used for external clock output or timing purposes. Note that an ALE pulse is skipped whenever accessing external data memory.

[0061] This pin is also used to input the programming pulse (PROG) during FLASH memory programming. If necessary, ALE operation can be disabled by setting bit D0 in location 8EH in the Special Function Register (SFR) area. With this bit set, only a MOVX or MOVC instruction can activate ALE. Furthermore, this pin is weakly pulled high; the ALE disable bit should be disabled when the microcontroller is executing an external program.

[0062] PSEN - Program Store Enable (PSEN) output is the read select signal of the external program memory. When the STC89C52 fetches instructions (or data) from the external program memory, PSEN is valid twice per machine cycle, that is, two pulses are output. During this period, when accessing the external data memory, the PSEN signal will be skipped twice.

[0063] EA / VPP—External access is enabled. To allow the CPU to access only the external program memory (addresses 0000H-FFFFH), the EA pin must be held low (connected to ground). Note: If the security bit LB1 is programmed, the EA pin state is internally latched during reset. If the EA pin is high (connected to Vcc), the CPU executes instructions from the internal program memory.

[0064] In some embodiments, the crystal oscillator unit (i.e., crystal oscillator circuit) is used to provide an operating signal pulse to the microcontroller. This pulse represents the operating speed of the microcontroller. For example, a 12 MHz crystal oscillator indicates that the microcontroller's operating speed is 12 Mbps.

[0065] In some embodiments, the reset unit is used to reset and restart the single-chip microcomputer when an error occurs in the operation of the single-chip microcomputer body.

[0066] like Figure 6 As shown, in some embodiments, the voltage comparator is of the model LM339. The LM339 (quad differential comparator) is a common integrated circuit that has four independent voltage comparators installed inside a voltage comparator chip. It is mainly used in high-voltage digital logic gate circuits. The LM339 can be used to easily form various voltage comparator circuits and oscillator circuits. The LM339 can be used to form a single-limit comparator, a hysteresis comparator, a dual-limit comparator (window comparator), an oscillator, etc. The LM339 can also be used to form high-voltage digital logic gate circuits and can be directly interfaced with TTL and CMOS circuits.

[0067] Features of LM339 voltage comparator

[0068] (1) The voltage offset is small, generally 2mV;

[0069] (2) The common mode range is very large, from 0V to the power supply voltage minus 1.5V;

[0070] (3) It has a wide limit on the internal resistance of the comparison signal source;

[0071] (4) LM339 has a wide VCC voltage range, 2-36V for single power supply and ±1V-±18V for dual power supply;

[0072] (5) The output terminal potential can be selected flexibly and conveniently.

[0073] The LM339 is similar to an operational amplifier with fixed gain. Each comparator has two inputs and one output. One input is called the non-inverting input, denoted by "+," and the other is called the inverting input, denoted by "-." When comparing two voltages, a fixed voltage (also called the threshold level, which can be selected at any point within the LM339's common-mode input range) is applied to one input, serving as a reference voltage. The other input is applied to the signal voltage to be compared. When the voltage at the "+" terminal is higher than the "-" terminal, the output transistor is cut off, effectively opening the output. When the voltage at the "-" terminal is higher than the "+" terminal, the output transistor is saturated, effectively connecting the output to a low potential. A voltage difference of at least 10mV between the two inputs ensures reliable output transitions from one state to the other. Therefore, the LM339 is ideal for applications such as weak signal detection. The LM339's output is equivalent to a transistor without a collector resistor. A pull-up resistor (3-15K) is typically connected from the output to the positive power supply. Choosing pull-up resistors of different values ​​will affect the output high voltage level. This is because when the output transistor is cut off, its collector voltage depends primarily on the pull-up resistor and the load value. Furthermore, the outputs of the comparators can be connected together.

[0074] like Figure 7 As shown in FIG8 , in some embodiments, the LED digital tube displays lanes in the following manner:

[0075] When the two LED digital tubes on the left and the one in the middle light up, it represents the left lane;

[0076] When the middle LED digital tube lights up, it represents the middle lane;

[0077] When the two right and one middle LED digital tubes light up, it represents the right lane.

[0078] A digital tube, also known as an LED digital tube, is commonly shaped like an "8" and has eight segments. In a common cathode LED digital tube, the cathodes of the LEDs are connected together, usually to ground. When the anode of a particular LED is at a high level, the LED lights up, and the corresponding segment is displayed. Similarly, in a common anode LED digital tube, the anodes of the LEDs are connected together, usually to a positive voltage. When the cathode of a particular LED is at a low level, the LED lights up, and the corresponding segment is displayed.

[0079] To display different symbols and numbers on an LED display, certain segments of the LEDs are illuminated. This provides the LED display with a code that displays different fonts. The LED display has eight segments. Therefore, the segment code provided to the LED display is exactly one byte. The correspondence between each segment and each bit in a byte is shown in Table 2-3.

[0080] Table 2-3 Correspondence between segment codes and bytes

[0081]

[0082] According to the above format, the segment codes of the 8-segment LED digital tubes that display various characters are shown in Table 2-4.

[0083] Table 2-4 8-segment LED segment codes

[0084]

[0085]

[0086] Use the program segment led{0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90, 0xBF, 0xff, 0x8f, 0xbf, 0xb9} to control the font of the LED digital tube. {0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80} represents the number of parking spaces (0, 1, 2, 3, 4, 5, 6, 7, 8), and {0xBF, 0xff, 0x8f, 0xbf, 0xb9} controls the font of the digital tube to guide the vehicle to a parking space.

[0087] By comparing the voltage at the positive input and negative input of the voltage comparator, when the positive input voltage is greater than the negative input voltage, the voltage comparator outputs a high level, the I / O port detects the high level, and the microcontroller determines that the parking space is occupied. When the positive input voltage is less than the negative input voltage, the voltage comparator outputs a low level, the I / O port detects the low level, and the microcontroller determines that the parking space is vacant. If parking spaces 1 and 2 are vacant, it means there is a parking space in the left lane; if parking spaces 4, 5, and 6 are vacant, it means there is a parking space in the center lane; if parking spaces 6, 7, and 8 are vacant, it means there is a parking space in the right lane.

[0088] like Figure 9 As shown, in some embodiments, the microcontroller controls the high and low levels of BEEP to determine whether the buzzer operates. Q1 is an NPN transistor. Therefore, when BEEP is high, the transistor turns on, grounding the buzzer and energizing it. Conversely, when BEEP is low, the transistor turns off, de-energizing the buzzer. R1 is a pull-up resistor, increasing the current at port I0 at high levels, sufficient to ensure the buzzer operates normally. R6 acts as a current limiter to protect the transistor.

[0089] like Figure 10As shown, in some embodiments, the power supply is connected to the socket, passes through a switch, and then passes through two capacitors for filtering. One of the two capacitors is a ceramic capacitor. A ceramic capacitor is a capacitor made of ceramic material as a dielectric, coated with a metal film on the ceramic surface, and then sintered at high temperature to form electrodes. It is commonly used in high-stability oscillation circuits as a loop capacitor, bypass capacitor, and pad capacitor. The other is an electrolytic capacitor. Polarized electrolytic capacitors are usually used in power supply circuits or medium-frequency and low-frequency circuits for power supply filtering, decoupling, signal coupling, time constant setting, and DC isolation. Generally, they cannot be used in AC power supply circuits. When used as a filter capacitor in a DC power supply circuit, its anode (positive pole) should be connected to the positive terminal of the power supply voltage, and the cathode (negative pole) should be connected to the negative terminal of the power supply voltage. Using two capacitors for filtering can produce a more stable and clean power supply. The LED at the back serves as a power indicator, and resistor R27 acts as a current limiting resistor to prevent overcurrent in the diode.

[0090] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Within the scope of the present invention, the technical features of the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the above aspects of the present invention, which are not provided in detail for the sake of simplicity.

[0091] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A parking patrol device, characterized in that: include: Single chip microcomputer module, parking space detection module, digital tube display module, buzzer alarm module, power supply module, including: The single chip microcomputer module includes a single chip microcomputer body, a crystal oscillator unit and a reset unit; The parking space detection module is electrically connected to the single-chip computer module. The parking space detection module includes an infrared transmitting end, an infrared receiving end, and a voltage comparator. The negative input end of the voltage comparator is connected to the infrared receiving end, and the positive input end of the voltage comparator is connected to a sliding resistor. When the voltage at the positive input end of the voltage comparator is greater than the voltage at the negative input end, the voltage comparator outputs a high level, and the single-chip computer module determines that the parking space is occupied. When the voltage at the positive input end of the voltage comparator is less than the voltage at the negative input end, the voltage comparator outputs a low level, and the single-chip computer module determines that the parking space is vacant. The digital tube display module is electrically connected to the single chip module, and the digital tube display module includes two "8" shaped LED digital tubes, one of which is used to display the lane, and the other is used to display the number of parking spaces; The buzzer alarm module is electrically connected to the single-chip computer module. When it detects that the parking space is full, the single-chip computer module will start the buzzer to alarm; The power module is used to connect the device to a socket so that the device is powered on.

2. A parking patrol guide device according to claim 1, characterized in that: The model of the single chip microcomputer is STC89C52.

3. A parking patrol guide device according to claim 1, characterized in that: The crystal oscillator unit is used to provide working signal pulses to the single chip microcomputer body.

4. The parking guide device according to claim 1, characterized in that: The reset unit is used to reset and restart the single-chip microcomputer when an error occurs during the operation of the single-chip microcomputer body.

5. The parking guide device according to claim 1, characterized in that: The model of the voltage comparator is LM339.

6. The parking guide device according to claim 1, characterized in that: The LED digital tube displays lanes in the following manner: When the two LED digital tubes on the left and the one in the middle light up, it represents the left lane; When the middle LED digital tube lights up, it represents the middle lane; When the two right and one middle LED digital tubes light up, it represents the right lane.

Images