CN105046988A - Road traffic signal lamp controller based on GSM network - Google Patents
Road traffic signal lamp controller based on GSM network Download PDFInfo
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- CN105046988A CN105046988A CN201510404959.6A CN201510404959A CN105046988A CN 105046988 A CN105046988 A CN 105046988A CN 201510404959 A CN201510404959 A CN 201510404959A CN 105046988 A CN105046988 A CN 105046988A
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Abstract
The invention relates to a road traffic signal lamp controller based on a GSM network. The controller is characterized in that an active infrared intrusion detector which is mounted at each lane exit of a crossroad is adopted to measure the number of vehicles allowed to pass through the lane exit, so as to enable a next crossroad traffic controller to calculate the release time, meanwhile the interval time between front and rear vehicles allowed to pass through the lane exit is measured, the jam condition of released vehicle is judged, and a powerful GSM network is utilized to achieve communication between crossroads in a way of mutually sending messages.
Description
(1) technical field:
The present invention relates to the road traffic signal lamp controller based on GSM network, it is by the infrared emission device being loaded on each track, crossroad flow export, measure the vehicle number of letting pass by flow export place, track, the clearance time is calculated for rear crossroad access controller, measure the interval time of letting pass by the fore-aft vehicle at flow export place, track simultaneously, judge clearance vehicle congestion situation, and utilize powerful GSM network, realize communicating between each crossroad by the mode of sending short messages mutually.
(2) background technology:
Along with the develop rapidly of China's economy, Urban vehicles poputation and the sustainable growth of traffic total amount, in urban road network, grade crossing it be the bottleneck of road passage capability.Vehicle is quite time-consuming by intersection, therefore improves the traffic capacity of grade crossing, and improving crossroad traffic signal lamp control ability is a urgent problem.
The new transport system of the complexity of a kind of informationization that intellectual traffic control mainly uses the new and high technologies such as GPS GPS to transform traditional transportation system and formed, intellectuality, socialization.But, outer mainly still the taking of Present Domestic carrys out optimization of road joints Traffic signal control according to road traffic measurement assessment and Principle of Statistics, vehicle flowrate measurement is the contactless traffic information collecting apparatus in a kind of road surface, adopt and receive vehicle reflection wave, add up the vehicle flowrate by surveyed area by the change of low and high level.
Also the embedded underground inductive coil adopted near all directions at crossing is had, when automobile will produce eddy current loss through out-of-date, the inductance of ring-type insulated line starts to reduce, passing through of automobile can be detected, but inductive coil volume is approximately 2 meters × 2 meters, installs inconvenient and easily damaged by pressure and be difficult to widely use.
(3) summary of the invention:
Because the various wagon flow in intersection and staggered the passing through of the stream of people are disturbed mutually compared with independent section, its traffic capacity reduces greatly, often cause local traffic to block up, and affects the unimpeded of whole road network.In order to improve the safety intersection of vehicle, conflicting wagon flow does not allow to let pass to vehicle simultaneously.Solution be in one-period, the time is divided into several sections and distribute to different wagon flow to vehicle let pass.The general traffic lights that all adopt command vehicle pass-through, and its Traffic signal control is usually predicted with artificial or draw traffic light time through complicated algorithm.That then commands both direction with the various combination of red, yellow, and green lamp respectively is open to traffic with forbidden, indicates as countdown with LED charactron.Make vehicle obtain green light in conflicting wagon flow to the Different periods in one-period to let pass, and the wagon flow of mutually not conflicting to vehicle can obtain green light in the same period and let pass, thus a continuous time in one-period reaches the object of safety persuasion traffic current.
But the crossroad access signal lamp control system of current use is a kind of timing clearance system, the vehicle of its setting is let pass and no thoroughfare for vehicles, and the time is all changeless, because crossroad often there will be the busy situation difference in each track, busy track vehicle is a lot, the clearance time seems too short, wagon flow is blocked up, the wagon flow of at this moment conflicting but seldom even does not have vehicle sometimes to track vehicle, but the vehicle on busy track also will wait for that the wagon flow of conflict terminated just to be allowed to let pass to fixing " clearance " time in idle track, this quality time just greatly wasted limited road traffic resource and go out pedestrian.
Therefore, only can only meet wagon flow to the requirement of traffic safety of not conflicting with assessment or expectation, need to measure each track vehicle fleet size so that the timing scheme of real-time conservative control signal lamp.But current various vehicle measurement means is only applicable to flow measurement mode vehicle flowrate because surveying instrument complex structure involves great expense measures assessment.
Native system adopts flow export place, each track at the parting of the ways respectively to install one pair of infrared emission device, the vehicle to be released such as whether to have for being identified in flow export place, track, and measure the vehicle number of letting pass by flow export place, track, the clearance time is calculated for rear crossroad access controller, measure the interval time of letting pass by the fore-aft vehicle at flow export place, track, for judging the vehicle congestion situation needing to let pass simultaneously.If conflict the green light time from wagon flow to track at the end of, the vehicle that this flow export place, track is etc. not to be released, then the green light time in this track gets the shortest time, the described shortest time must look the sidewalk width of wagon flow to track of conflict, being taken as 15 seconds-30 seconds, passing through for allowing pedestrian.When green light, let pass by exceeding setting value the interval time of the fore-aft vehicle at flow export place, track if measured, such as 5-12 second, namely think that clearance vehicle is little, if now the green light time has exceeded the described shortest time, then enter green light countdown in 15 seconds immediately, otherwise get the shortest time.Described measurement is let pass by the vehicle number at flow export place, track, is to be used as rear crossroad access controller to calculate the clearance time.Namely its green light time is first by the vehicle data receiving the clearance of track, crossroad, front, calculate the vehicle number arrived and determine the clearance time, but this clearance time is also with vehicle stop off, lane change and delay, and actual failing enters the situations such as this clearance time zone, change the clearance time in real time by the interval time of fore-aft vehicle during measurement clearance.The concrete calculating clearance time is the vehicle number that the track sent by front crossroad access controller is flowed out, average speed calculates and arrives this crossroad time, draw the vehicle number waited for a green light, the time of blocking of its every portion vehicle and off time are added simultaneously, get identical value 2-4 second its off time, obtain the clearance time that this flows to track vehicle, and send its data to rear crossroad access controller simultaneously, if this flows to the track green light time when closing to an end, according to the data that front crossroad access controller sends, still have and enter near this track green light clearance end time point more than 5-8 car, the wagon flow of simultaneously conflicting does not have vehicle to wait to track, then green light time delay 10-30 second, green time is longer, the vehicle number passed through is more, green time occupation rate reflects the bus capacity at crossing, namely should meet a wagon flow to vehicle pass-through demand larger, the green time distributing to it is longer, because this programme traffick number summation is more than waiting vehicle number, therefore the vehicle delay time at stop is substantially reduced.
Infrared emission device is made up of infrared transmitter, infrared receiving set, but infrared beam need be focused into thinner parallel beam by the optical lens focusing being placed in Transmitting and Receiving End respectively by its infrared beam, concentrates transmission to enable the energy of infrared light.The infrared beam flying pulse signal that infrared diode is launched under Single-chip Controlling, each cycle of this signal is made up of two broad pulses and two burst pulses, a wide low level pulse is sent out in the ending of each cycle, when with broad pulse representative digit " 1 ", burst pulse representative digit " 0 " then easily uses 4 kinds of different permutation and combination, such as 1010, 0110, 0101, 1100 etc., identify the infrared beam flying pulse signal on 4 tracks, single-chip microcomputer adopts and interrupts or inquiry mode reception infrared beam flying pulse signal, when in infrared receiving set, infrared sensor receives, by single-chip microcomputer to it to send and infrared beam flying pulse signal that it receives compares identification, extract the credible pulse signal of this frequency, effective eliminating external interference.Single-chip microcomputer constantly receives the infrared beam flying pulse signal that in flow export place, each track infrared emission device, infrared diode sends at ordinary times, if certain track continues 15-30 at green light time infrared sensor do not receive infrared beam flying pulse signal second, namely alerting signal is sent, system transfers the work of traffic lights time control pattern to, control model when signal normally recovers to become again.Infrared band in sunshine is wider, and the infrared band energy of characteristic frequency is little, very little on the impact of infrared receiving set, and in order to anti-interference, ultrared power selects bigger numerical depending on crossroad weather conditions as far as possible.Although active infra-red greatly reduces the impact of the change of weather on injection device, but in order to safety, in infrared emission device, single-chip microcomputer constantly checks the infrared beam flying pulse signal that infrared sensor receives, when long-time abnormal infrared beam undesired signal discovery 15-40 second, affect infrared emission device normally to work, namely when it is not described infrared beam flying pulse signal, then the work of traffic lights time control pattern is transferred to, control model when signal normally recovers to become again.
In order to make the transmission of the vehicle flowrate data between each crossroad access controller along the line, realizing crossroad access and controlling in real time, the communication between crossroad access controller along the line is most basic demand.
Native system utilizes powerful GSM network, just can realize communicating by the mode of sending short messages mutually between each crossroad.The SMS of GSM itself possesses data transport functions, the transmission of a message just constitutes and once communicates, the transmission of message always carries out relaying by the SMS service center (SMSC) being in GSM outside, the SMS service SMS of GSM it need not dial and can connect, the information that will send out is added that stay of two nights data are sent to short message service center, completes after storage sending to the final stay of two nights again through short message service center.So information can not be lost when GSM terminal and the stay of two nights are not started shooting.
The each crossroad of native system is all provided with SMS R-T unit, and carry out one-way communication by SMS R-T unit, each crossroad reception front Traffic Flow at Intersection data also calculate time of arrival and vehicle number and are added with the current vehicle number waiting and determine this clearance time, the more green times of the vehicle number making this wait are longer, can with reference to last data when not receiving front Traffic Flow at Intersection data.Phone number yardage is taken in order to reduce, each crossroad SMS R-T unit shares two telephone number tdm communications, and by the arrangement of road order, if two telephone numbers are A and B, telephone number is then divided to be arranged as ABABAB ... and communicate in each stipulated time respectively, not at the SMS R-T unit deenergization of call duration time, only switch on power at the SMS R-T unit of call duration time.Because conventional clock circuit accumulation timing error is very large, every day, error did not include large for 5 minutes, therefore native system adopts the count value of the zero cross signal of detection of grid cycle as time reference, communication is started when the grid cyclic wave zero passage of the count value set to make SMS R-T unit, such as each communication is separated by a setting value of 50-200 grid cyclic wave (be equivalent to 1-4 second), the SMS R-T unit of each crossroad is by setting count value sequenced communications, the time of first time communication makes count value described in each SMS R-T unit reset by the clock through mutually correcting at the time point of agreement simultaneously, and carry out a call duration time point count value correction, the described setting count value receiving signal time point when namely complying with communication is the correction that standard carries out count value, accurate identification decision and counting is easy to because cycle frequency is low, therefore corrected once every 5-10 days after, greatly save software and hardware resources to take, for power network and not existing between the homophase line of electric force phase differential of different power transformer, owing to there is not cumulative errors, therefore not influential system to the error requirements of the time expressed by ondomete numerical value.
Crossroad comprise east orientation west, west eastwards, south orientation north, the southern wagon flow of north orientation to, every bar wagon flow to all comprising 1-2 Through Lane and track of turning left and turn right, above-mentioned wagon flow to each track flow export one pair of infrared emission device is installed.The stop line of signal lamp intersection, represent the parking spot that vehicle waits for a green light, namely in the track center of road surface stop line 0 ﹒ 5 meters-1 meter inwards, bury the infrared diode of emitter underground, infrared sensor in its receiving trap is installed on the traffic signals lamp stand of trackside or the transverse arm of special column, if the stop line of traffic signals lamp stand and track flow export has certain distance, when calculating is waited several, be converted to by this distance number of waiting, be generally 1-3 car.For the ease of the debugging of infrared emission device, transverse arm is installed on directly over infrared diode, namely the plane orthogonal that formed of transverse arm and infrared diode is in road surface, transverse arm height is 3 ﹒ 5 meters-7 meters, transverse arm length gets 3-6 rice depending on width of roadway, transverse arm is provided with equally distributed 3-4 the infrared sensor corresponding with track.
At the circular hole that the infrared diode installation site drill diameter on road surface is the dark 20CM of 8-12CM, be the steel pipe of 8-12CM height 20CM by resin glue fixed outer diameter in circular hole, steel pipe bottom welding bottom seals, steel pipe two bottom sides leaves the hole of drainpipe and cable tube, drainpipe is through the lower end of steel tubing portions, be drilled with several aperture for steel duct water flowing, above the drainpipe bottom steel pipe, place wire netting, for isolating sandstone.Steel duct is welded with support, and fixed head is fixed on support, and infrared diode external member is fixed on fixed head, support leaves the hole of strip, for through screw, makes fixed head fixed position adjustable.Light that in infrared emission device, infrared diode sends must aim at the infrared sensor in receiving trap, can help to aim at by Infrared locator etc., aims at rear screw, pad, anti-skid washer, silica gel Shockproof gasket make fixed head be fixed on support.Road surface install steel pipe upper end fix a cover plate through screw, a circular glass sheet is inlayed at cover plate central position, for the light sent through infrared diode, circular glass plate plane a little less than metal cover board plane to reduce friction.
Traffic controller is made up of single-chip microcomputer, EEPRAM, I2C serial communication module, light-emitting diode display module and power module, wherein I2C serial communication module is used for the communication between SMS R-T unit, EEPRAM is for preserving data, light-emitting diode display module comprises driving circuit and display circuit, and it connects, by Single-chip Controlling with the I/O mouth of single-chip microcomputer.
(4) accompanying drawing illustrates:
Fig. 1 is that crossroad wagon flow is to distribution plan;
Fig. 2 is that described infrared diode buries schematic diagram underground;
Fig. 3 is SMS R-T unit structural representation.
(5) embodiment:
Based on the road traffic signal lamp controller of GSM network crossroad wagon flow to distribution plan as shown in Figure 1, this crossroad wagon flow is to distribution plan, only represent the one that various dissimilar wagon flow controls to distribution and wagon flow thereof, other type wagon flow controls easily to be obtained by analogy to distribution and wagon flow thereof.When in Fig. 1 being East and West direction when red, in north-south, A is the straight-through green light time with turning right, and B is the green light time of turning left.
Described infrared diode buries schematic diagram underground as shown in Figure 2.Its structure comprises: steel pipe (1), cover plate (2), circular glass sheet (3), infrared diode external member (4), fixed head (5), screw kit (6), support (7), terminal box (8), wire (9), wire netting (10), cable tube (11), drainpipe (12), bottom (13) are formed, and wherein screw kit (6) is made up of screw, nut, pad, anti-skid washer, silica gel Shockproof gasket.During installation, support (7) plane center line should with line parallel in the transverse arm of installation infrared sensor.For the hole through screw in screw kit (6) on support (7), it is a kind of elongate aperture along support (7) plane center line direction, make fixed head (5) fixed position adjustable, and by screw, nut, pad, anti-skid washer, silica gel Shockproof gasket, fixed head (5) is fixed on support (7).
Described SMS R-T unit structural representation as shown in Figure 3.Its structure by, power supply (31), single-chip microcomputer (32), gsm module (33), SIM card (34), eeprom memory (35) form.In SMS R-T unit, single-chip microcomputer (32) realizes serial communication by I2C bus and traffic controller (36), and general supply (37) provides the power supply (31) of SMS R-T unit under traffic controller (36) controls.
System utilizes single-chip microcomputer (32) to control gsm module (33), remote data wireless transmission can be realized in SMS messaging mode, serial port and the gsm module (33) of single-chip microcomputer (32) are directly connected, complete the initialization to gsm module (33), realize the transmission-receiving function of short message, single-chip microcomputer (32) extends the coding and decoding that EEPRAM storer (35) is used for storing user data and short message.Gsm module (33) adopts chip TC35i, single-chip microcomputer (32) to adopt a 89C51 and eeprom memory (35) to adopt chip AT24C32, and its Main Function stores data, and power cut-off information also can not be lost.In addition, single-chip microcomputer (32) 89C51 is also connected with affiliated intersection traffic controller (36) by expansion I2C bus and carries out exchanges data.Gsm module (33) chip TC35i, it is RS232 data port, and single-chip microcomputer (32) 89C51 is connected with gsm module (33) with level shifting circuit chip MAX232 by serial line interface integrated circuit.
Gsm module (3) chip TC35i integrates radio circuit and base band, for data, voice, short message and fax provide quick, reliable, safe transmission, TC35i has 40 pins, is divided into 5 classes, i.e. power supply, data I/O, SIM card, audio interface and control.
Gsm module (33) chip TC35i supports AT Command Set, wherein contain the control to SMS, single-chip microcomputer, by sending a series of AT instruction to gsm module (33), completes the initialization to gsm module (3) and receiving short message.Be connected to the SIM card (34) of gsm module (33), must first carry out necessary arrange enable and setting Short Message Center's service number and make it to contact with Short Message Center to SIM card (34) on mobile phone, therefore in use not need to carry out similar setting again.
Because only transceiving data, the transmitting-receiving of SMS adopts TEXT pattern.TEXT pattern is a kind of tactic pattern based on ASCII character.Native system user data is the ASCII character of limited no more than tens character quantities, single-chip microcomputer (32) on the contrary the character string received directly with forms mode table look-up convert command code and data to or convert thereof into ASCII character send.
Claims (2)
1. based on the road traffic signal lamp controller of GSM network, it is characterized in that, it adopts flow export place, each track at the parting of the ways respectively to install one pair of infrared emission device, for identifying whether flow export place, track the vehicle to be released such as has, and measure the vehicle number of letting pass by flow export place, track, calculate the clearance time for rear crossroad access controller, measure the interval time of letting pass by the fore-aft vehicle at flow export place, track simultaneously, for judging the vehicle congestion situation needing to let pass, if conflict the green light time from wagon flow to track at the end of, the vehicle that this flow export place, track is etc. not to be released, then the green light time in this track gets the shortest time, the described shortest time must look the sidewalk width of wagon flow to track of conflict, get 15 seconds-30 seconds, pass through for allowing pedestrian, its green light time is by the vehicle data receiving the clearance of track, crossroad, front, calculate the vehicle number arrived and determine the clearance time, this clearance time is also with vehicle stop off, lane change and delay and actual situation of failing to enter this clearance time zone, by measuring the interval time of letting pass by the fore-aft vehicle at flow export place, track, if exceed setting value, namely think that clearance vehicle is little, if now the green light time has exceeded the described shortest time, then enter green light countdown in 15 seconds immediately, otherwise get the shortest time, the real-time change clearance time, the time of blocking of its every portion vehicle and off time are added, get identical value 2-4 second its off time, obtain the clearance time that this flows to track vehicle, and send its data to rear crossroad access controller simultaneously, if this flows to the track green light time when closing to an end, according to the data that front crossroad access controller sends, still have and enter near this track green light clearance end time point more than 5-8 car, the wagon flow of simultaneously conflicting does not have vehicle to wait to track, then green light time delay 10-30 second, green time is longer, the vehicle number passed through is more, green time occupation rate reflects the bus capacity at crossing,
The infrared beam flying pulse signal that infrared diode is launched under Single-chip Controlling, each cycle of this signal is made up of two broad pulses and two burst pulses, a wide low level pulse is sent out in the ending of each cycle, when with broad pulse representative digit " 1 ", burst pulse representative digit " 0 " then easily uses 4 kinds of different permutation and combination, 1010, 0110, 0101, 1100, identify the infrared beam flying pulse signal on 4 tracks, single-chip microcomputer adopts and interrupts or inquiry mode reception infrared beam flying pulse signal, when in infrared receiving set, infrared sensor receives, by single-chip microcomputer to its send and infrared beam flying pulse signal that it receives compare identification, extract the credible pulse signal of this frequency, effective eliminating external interference, single-chip microcomputer constantly receives the infrared beam flying pulse signal that in flow export place, each track infrared emission device, infrared diode sends at ordinary times, if certain track continues 15-30 at green light time infrared sensor do not receive infrared beam flying pulse signal second, or find long-time abnormal infrared beam undesired signal 15-40 second, affect infrared emission device normally to work, namely alerting signal is sent, system transfers the work of traffic lights time control pattern to, control model when signal normally recovers to become again,
The each crossroad of native system is all provided with SMS R-T unit, and carry out one-way communication by SMS R-T unit, each crossroad reception front Traffic Flow at Intersection data also calculate time of arrival and vehicle number and are added with the current vehicle number waiting and determine this clearance time, the more green times of the vehicle number making this wait are longer, phone number yardage is taken in order to reduce, each crossroad SMS R-T unit shares two telephone number tdm communications, and by the arrangement of road order, if two telephone numbers are A and B, telephone number is then divided to be arranged as ABABAB and communicate in each stipulated time respectively, not at the SMS R-T unit deenergization of call duration time, only switch on power at the SMS R-T unit of call duration time, because conventional clock circuit accumulation timing error is very large, therefore native system adopts the count value of the zero cross signal of detection of grid cycle as time reference, communication is started when the grid cyclic wave zero passage of the count value set to make SMS R-T unit, the SMS R-T unit of each crossroad is by setting count value sequenced communications, the time of first time communication makes count value described in each SMS R-T unit reset by the clock through mutually correcting at the time point of agreement simultaneously, and carry out a call duration time point count value correction, the described setting count value receiving signal time point when namely complying with communication is the correction that standard carries out count value, for power network and not existing between the homophase line of electric force phase differential of different power transformer, owing to there is not cumulative errors, therefore not influential system to the error requirements of the time expressed by ondomete numerical value,
Above-mentioned wagon flow to each track flow export one pair of infrared emission device is installed, namely in the track center of road surface stop line 0 ﹒ 5 meters-1 meter inwards, bury the infrared diode of emitter underground, infrared sensor in its receiving trap is installed on the traffic signals lamp stand of trackside or the transverse arm of special column, if the stop line of traffic signals lamp stand and track flow export has certain distance, when calculating is waited several, number of waiting is converted to by this distance, for the ease of the debugging of infrared emission device, transverse arm is installed on directly over infrared diode, namely the plane orthogonal that formed of transverse arm and infrared diode is in road surface, transverse arm height is 3 ﹒ 5 meters-7 meters, transverse arm length gets 3-6 rice depending on width of roadway, transverse arm is provided with equally distributed 3-4 the infrared sensor corresponding with track,
At the circular hole that the infrared diode installation site drill diameter on road surface is the dark 20CM of 8-12CM, be the steel pipe of 8-12CM height 20CM by resin glue fixed outer diameter in circular hole, steel pipe bottom welding bottom seals, steel pipe two bottom sides leaves the hole of drainpipe and cable tube, drainpipe is through the lower end of steel tubing portions, bore several aperture for steel duct water flowing, wire netting is placed above drainpipe bottom steel pipe, for isolating sandstone, steel duct is welded with support, fixed head is fixed on support, infrared diode external member is fixed on fixed head, support leaves the hole of strip, for passing screw, make fixed head fixed position adjustable, the light that in infrared emission device, infrared diode sends must aim at the infrared sensor in receiving trap, aim at rear screw, pad, anti-skid washer, silica gel Shockproof gasket makes fixed head be fixed on support, a cover plate is fixed through screw in the steel pipe upper end of installing on road surface, a circular glass sheet is inlayed at cover plate central position, for the light sent through infrared diode, circular glass plate plane a little less than metal cover board plane to reduce friction.
2. the road traffic signal lamp controller based on GSM network according to claim 1, is characterized in that comprising:
Fig. 2 is that described infrared diode buries figure underground, by steel pipe (1), cover plate (2), circular glass sheet (3), infrared diode external member (4), fixed head (5), screw kit (6), support (7), terminal box (8), wire (9), wire netting (10), cable tube (11), drainpipe (12), bottom (13) is formed, wherein screw kit (6) is by screw, nut, pad, anti-skid washer, silica gel Shockproof gasket forms, during installation, support (7) plane center line should with line parallel in the transverse arm of installation infrared sensor, for the hole through screw in screw kit (6) on support (7), it is a kind of elongate aperture along support (7) plane center line direction, make fixed head (5) fixed position adjustable, and pass through screw, nut, pad, anti-skid washer, silica gel Shockproof gasket makes fixed head (5) be fixed on support (7),
Described SMS R-T unit structural representation as shown in Figure 3, its structure by, power supply (31), single-chip microcomputer (32), gsm module (33), SIM card (34), eeprom memory (35) form, in SMS R-T unit, single-chip microcomputer (32) realizes serial communication by I2C bus and traffic controller (36), and general supply (37) provides the power supply (31) of SMS R-T unit under traffic controller (36) controls;
Gsm module (33) adopts chip TC35i, single-chip microcomputer (32) adopts a 89C51 and eeprom memory (35) to adopt chip AT24C32, its Main Function stores data, and power cut-off information also can not be lost, in addition, single-chip microcomputer (32) 89C51 is also connected with affiliated intersection traffic controller (36) by expansion I2C bus and carries out exchanges data, gsm module (33) chip TC35i, it is RS232 data port, single-chip microcomputer (32) 89C51 is connected with gsm module (33) with level shifting circuit chip MAX232 by serial line interface integrated circuit,
Because only transceiving data, the transmitting-receiving of SMS adopts TEXT pattern, TEXT pattern is a kind of tactic pattern based on ASCII character, native system user data is the ASCII character of limited no more than tens character quantities, single-chip microcomputer (32) on the contrary the character string received directly with forms mode table look-up convert command code and data to or convert thereof into ASCII character send.
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| CN106097739A (en) * | 2016-07-11 | 2016-11-09 | 浙江交通职业技术学院 | Traffic safety system for prompting based on smart mobile phone |
| CN106097739B (en) * | 2016-07-11 | 2019-01-11 | 浙江交通职业技术学院 | Traffic safety system for prompting based on smart phone |
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