CN202093688U

CN202093688U - Parking stall detection apparatus based on wireless ad-hoc network

Info

Publication number: CN202093688U
Application number: CN2011201884105U
Authority: CN
Inventors: 曾明; 洪增林
Original assignee: South China University of Technology SCUT
Current assignee: South China University of Technology SCUT
Priority date: 2011-06-07
Filing date: 2011-06-07
Publication date: 2011-12-28
Anticipated expiration: 2021-06-07

Abstract

The utility model discloses a parking stall detection apparatus based on a wireless ad-hoc network, comprising a parking stall detection sensor, a Zigbee terminal node, a Zigbee route node, a Zigbee coordinator node and a computer, wherein the parking stall detection sensor transmits a detected signal to the Zigbee terminal node, then to the Zigbee route node and the Zigbee coordinator node sequentially, and finally to the computer. By utilizing the advantages of the Zigbee wireless ad-hoc network, such as high security, data is transmitted reliably and realtimely, the communication efficiency is high, the cost is low and the power consumption is low.

Description

Parking stall measure device based on wireless self-networking

Technical field

The utility model relates to parking stall measure device field, specifically is a kind of parking stall measure device based on wireless self-networking.

Background technology

The parking stall measure device is the important component part that Intelligentized parking lot is built, and the supvr wishes to obtain parking stall operating position in the parking lot in real time by the parking stall measure device.

In the patent No. is 200520057183.7 novel practical patent, a kind of parking position guiding device is disclosed, by ultrasound wave parking stall detector is installed above the central authorities of parking stall, pass through RS-485 transmission information flow between manager and each ultrasound wave parking stall detector, each manager, communication converter and communication bus become an integral body with the computing machine white silk, but this bus communication mode, and quantities is big, the wiring cost height, troublesome maintenance.

Not only can avoid the wiring and the transformation that do not stop doing business based on the solution of Zigbee wireless self-networking, save expensive wiring cost, and this scheme construction flexibly, node can move arbitrarily; Simultaneously can pass through the wireless mode upgrade software, the top standard who keeps market, the Zigbee wireless self-networking is with its distinctive low cost, low-power consumption, high safety, advantages such as large-scale self-organizing network now in the huge advantage in parking lot management field, mean change gradually for managing system of car parking.

Summary of the invention

At the deficiencies in the prior art, the utility model provides a kind of parking stall measure device based on wireless self-networking, the utility model is with detected parking space information, be transferred to control center by the Zigbee wireless self-networking, control center also can carry out active inquiry to parking space information by the Zigbee wireless self-networking.

Realize the purpose of this utility model by the following technical solutions:

Based on the parking stall measure device of wireless self-networking, this device comprises: parking stall measure sensor, Zigbee terminal node, Zigbee routing node, Zigbee coordinator node and computing machine; Described parking stall measure sensor is transferred to the Zigbee terminal node with detected signal, passes through Zigbee routing node and Zigbee coordinator node more successively, is transferred to computing machine at last.

Described parking stall measure sensor comprises single-chip microcomputer and ultrasonic sensor; Described ultrasonic sensor is transferred to single-chip microcomputer with detected signal, and single-chip microcomputer passes to the Zigbee terminal node with this signal.

Described Zigbee terminal node, Zigbee routing node and Zigbee coordinator node are the wireless singlechip minimum system.

Compared with prior art, the utility model has the following advantages and beneficial effect:

(1) because the advantage such as high security of Zigbee wireless self-networking, the parking stall measure device can be in real time Data transmission reliably, control center also can be by the operating position of Zigbee wireless self-networking active inquiry parking stall, and can upgrade for node software by the Zigbee wireless self-networking, keep the technical advance of system.

(2) communication efficiency height, cost is low: the Zigbee technology is a kind of emerging short distance, low rate radio network technique, the Zigbee technology is followed the wireless sensor networking standard simultaneously, has MANET, the self-regeneration function, the parking stall measure device reports to control center by the Zigbee wireless self-networking by wireless self-networking.

(3) power consumption is little: when not having car turnover parking stall, by programming Control, can make the Zigbee terminal node most of the time all be in dormant state, hyperacoustic radiating circuit and receiving circuit all adopt low energy-consumption electronic device, reduce the power consumption of device to greatest extent, and use powered battery.

(4) realize parking stall measure with the ultrasonic ranging principle, simple and reliable.

Description of drawings

Fig. 1 is the working interface figure in the utility model device;

Fig. 2 is the scheme of installation of parking stall measure sensor in the utility model device;

Fig. 3 is a ultrasonic transmit circuit schematic diagram in the utility model device;

Fig. 4 is a ultrasound wave receiving circuit schematic diagram in the utility model device;

Fig. 5 is a power module circuitry schematic diagram in the utility model device;

Fig. 6 is wireless singlechip minimum system circuit theory diagrams in the utility model device;

Fig. 7 is that Zigbee wireless self-networking data transmission flows to signal in the utility model device;

Fig. 8 is a Zigbee wireless network building process process flow diagram in the utility model device.

Embodiment

Below in conjunction with specific embodiment the present invention is done further concrete detailed description the in detail, but embodiments of the present invention are not limited thereto, the technological parameter for not indicating especially can carry out with reference to routine techniques.

As shown in Figure 1, single-chip microcomputer 3 provides the input pulse signal by the I/O interface for ultrasonic sensor radiating circuit 1, ultrasound wave receiving circuit 2 receives the ultrasound wave arteries and veins that fires back and sends into single-chip microcomputer 3, and single-chip microcomputer 3 can judge by analyzing and processing whether vehicle is arranged on the parking stall.When operating position changes on the parking stall, single-chip microcomputer 3 by with Zigbee terminal node 4 on the I/O port that directly links to each other of CC2430 wireless singlechip wake Zigbee terminal node 4 up, Zigbee terminal node 4 is transferred to Zigbee coordinator node 6 with the parking space information data of obtaining by the Zigbee wireless self-networking.Because the Zigbee network has the characteristics of short-distance transmission, so in order to make the coverage of Zigbee wireless self-networking bigger, the stability of network data transmission is higher, generally when wireless self-networking, must transmit through 5 pairs of data of Zigbee routing node, be transferred to Zigbee coordinator node 6 again, Zigbee coordinator node 6 is mster-control centres of Zigbee network, as the nucleus module of Zigbee wireless self-networking, by the RS232 serial ports to control center's computing machine 7 transmission information.

As shown in Figure 2, the parking stall measure sensor generally be installed in the parking stall directly over or under, can detect parking space information real-time and accurately, directly link to each other with Zigbee terminal node 4 in the Zigbee wireless self-networking by single-chip microcomputer 3.The Zigbee terminal node should be installed in the place of easy discovery Zigbee network, and that can not place is low excessively, is placed on the metope of parking stall afterbody the position apart from 2 meters on ground usually.

As shown in Figure 3, ultrasonic transmit circuit 1 mainly is made up of emissioning signal treatment circuit and ultrasound transmitting transducer.IN_40K among the figure is the 40kHZ square wave that is produced by single-chip microcomputer 3; VCC is the 5V voltage that is provided by power module 8.The square-wave signal of 40kHZ can not directly be used for driving ultrasound transmitting transducer, needs to amplify through the LM386 amplifying circuit, and the piezoelectric ceramics that drives UCM40T is that ultrasound transmitting transducer sends ultrasonic pulse.

Be illustrated in figure 4 as ultrasound wave receiving circuit schematic diagram.The ultrasound wave receiving transducer receives to such an extent that the ultrasonic echo signal is very faint, needs to handle through the amplification filtering of received signal treatment circuit.Selecting for use CX20106A to make received signal handles, 5 pins of CX20106A connect 200k Ω resistance, when CX20106A receives the signal of 40kHZ, can produce the pulse of a low level negative edge at the 7th pin, this signal can be connected to the external interrupt pin of single-chip microcomputer 3 and import as look-at-me.Only when parking space information changes, single-chip microcomputer 3 just can wake Zigbee terminal node 4 emission parking stall information datas up, when the most of the time, parking space information did not change, the CC2430 wireless singlechip of Zigbee terminal node 4 is in dormant state, stream consumption during the CC2430 dormancy has only 0.9 μ A, and the working time of Zigbee terminal node transceive data also only needs tens to the hundreds of millisecond, and the power consumption of Zigbee terminal node 4 is very low, generally adopts powered battery.

As Fig. 5 is power module 8 circuit theory diagrams.The hardware circuit of Zigbee wireless self-networking is as control chip with the CC2430 wireless singlechip, the CC2430 single-chip microcomputer needs 3.3V and 1.8V power supply, and the logic high of parking stall measure sensor is 5V, therefore power module 8 must be able to provide the power supply of 5V, 3.3V and 1.8V, selects LM7805, AMS1117-3.3 and AMS1117-1.8 level switch module respectively for use.On power supply was selected, Zigbee coordinator node 6 and routing node 5 were responsible for the foundation and the maintenance of Zigbee wireless self-networking, play conclusive effect for whole stability of network, generally use the power supply of stable external power supply; Because the Zigbee technology has characteristics such as power consumption is little, transfer rate is low, and Zigbee terminal node 4 functions are simple, do not need in running order always, so can adopt the powered battery mode.

Be illustrated in figure 6 as CC2430 minimum system circuit theory diagrams.Coordinator node 6 in the Zigbee wireless self-networking, routing node 5 and terminal node 4 all are the minimum systems of CC2430.The minimum system of CC2430 wireless singlechip has comprised clock, antenna, reset circuit, debugging interface.The clock of CC2430 is connected by the 32MHZ crystal oscillator that XOSC_Q1, XOSC_Q2 pin are connected P2_3/XOSC_Q1 with the 32.768kHz crystal oscillator, P2_4/XOSC_Q2 provides.This circuit uses a unbalanced antennas, and is better for making antenna performance, can connect a balun transformer.Balun transformer in the circuit is made up of capacitor C 13 and inductance L 1, L2 and L3 and a PCB microwave transmission line, and total satisfies the requirement of radio frequency I/O build-out resistor (50 Ω).Emulation interface adopts the jtag interface of 10 cores to download for artificial debugging and program code.

Flow to signal as Fig. 7 for the parking space information data transmission.The parking stall measure sensor directly links to each other by the single-chip processor i/o mouth with Zigbee terminal node 4.Zigbee terminal node 4 is communicated by letter with Zigbee coordinator node 6 through Zigbee routing node 5, coordinator node 6 is communicated by letter with control center's (computing machine 7), report parking space information, wherein Zigbee terminal node 4 is RFD (Reduced Function Device, half function device), Zigbee routing node 5 and Zigbee coordinator node 6 are FFD (Full Function Device, full-function devices).

Fig. 8 is a Zigbee wireless network building process process flow diagram, Zigbee telegon 6 is that whole Zigbee parking stall measure terminal node is formed Network Management person, it be responsible for the distribution of foundation, address of network and member's adding, node device data renewal, data forwarding table, data association table maintenance and upgrade automatically according to network conditions.Its sensor node in can the coverage of active scan own, Zigbee terminal node 4 is always attempted to communicate with coordinator node.Have only a telegon in the network as network center, be used for the collection of parking stall measure device data, and parking space information is informed upper strata control center (computing machine 7).

Before the node networking of parking stall, must set up network as the coordinator node 6 of network center.Understand search network behind the last point of coordinator node 6 (FFD), select first passage of 16 passages (Channel), send a Channel_Busy frame, the node of request on this passage replied.If on physical space, there has been the Zigbee network that uses this passage, coordinator node (FFD2) in this network can be replied a frame after receiving the Channel_Busy frame so, notifies firm electrifying startup coordinator node 6 these passages occupied.The coordinator node 6 (FFD) that has just gone up the some startup receives replys after the frame, obtains the occupied information of this passage, so change to next passage, sends a Channel_Busy frame.So go down, after sending the Channel_Busy frame, this coordinator node 6 (FFD) do not receive any answer, confirm that current this passage is an idle channel, so coordinator node 6 (FFD1) is set up the Zigbee network on this idle channel, wait for the adding of terminal node 4 (RFD).So new Zigbee network construction success.If 16 passages among the Zigbee network C HANLIST are all occupied, coordinator node 6 (FFD) does not just have idle channel to be used for setting up network, and the result is the network struction failure.

After coordinator node 6 networks were set up successfully, coordinator node 6 was in the cycle detection state always, and each cycle begins all to detect and has or not new terminal node 4 (RFD) to add or exit network, and adds/exit network subroutine if having just to call.Coordinator node 6 can send network-maintenance signals then, and whether the terminal node 4 that detects in the network exits network because of outage or module damage, and if this occurs, we should in time change module or battery, to keep the good operation of total system.

The foregoing description is a preferred implementation of the present invention; but embodiments of the present invention are not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.

Claims

1. based on the parking stall measure device of wireless self-networking, it is characterized in that this device comprises: parking stall measure sensor, Zigbee terminal node, Zigbee routing node, Zigbee coordinator node and computing machine; Described parking stall measure sensor is transferred to the Zigbee terminal node with detected signal, passes through Zigbee routing node and Zigbee coordinator node more successively, is transferred to computing machine at last.

2. device according to claim 1 is characterized in that, described parking stall measure sensor comprises single-chip microcomputer and ultrasonic sensor; Described ultrasonic sensor is transferred to single-chip microcomputer with detected signal, and single-chip microcomputer passes to the Zigbee terminal node with this signal.

3. device according to claim 1 and 2 is characterized in that, described Zigbee terminal node, Zigbee routing node and Zigbee coordinator node are the wireless singlechip minimum system.