CN108831167A - A kind of crossroad access lamp control system - Google Patents
A kind of crossroad access lamp control system Download PDFInfo
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- CN108831167A CN108831167A CN201810526526.1A CN201810526526A CN108831167A CN 108831167 A CN108831167 A CN 108831167A CN 201810526526 A CN201810526526 A CN 201810526526A CN 108831167 A CN108831167 A CN 108831167A
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- 239000000919 ceramic Substances 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 2
- 230000009466 transformation Effects 0.000 abstract description 2
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/07—Controlling traffic signals
- G08G1/081—Plural intersections under common control
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Abstract
The present invention relates to a kind of crossroad access lamp control systems, belong to traffic light control technical field.The present invention includes LED digital display tube circuit, circuit of LED and single-chip microcontroller governor circuit；The single-chip microcontroller governor circuit is mainly made of reset circuit, crystal oscillating circuit, key circuit.The present invention utilizes the setting of single-chip computer and its peripheral circuit and program, and 12 red greenish-yellow lamps for controlling crossroad are alternately lighted and extinguished, and between the display countdown of LED digital display tube.The present invention is compared with prior art, the main passage that in emergency circumstances emergency vehicles can be achieved, it realizes that the countdown of red greenish-yellow lamp is shown, the conversion of the normal transformation of crossroad access lamp and four states of 12 traffic lights is realized, to guarantee the unimpeded operation of each road vehicle.
Description
Technical field
The present invention relates to a kind of crossroad access lamp control systems, belong to traffic light control technical field.
Background technique
This traffic light control system makes pedestrian and the orderly traveling of vehicle, does not influence the normal trip of pedestrian and vehicle, protects
The safety of pedestrian and vehicle are demonstrate,proved, and contingency mode can be switched to.And current traffic lights is not smart enough, stability is less high
And control is complicated, designs the powerful traffic lights of one kind and plays a significant role.
Summary of the invention
The technical problem to be solved by the present invention is to：The present invention provides a kind of crossroad access lamp control system, to be used for
The problem that current traffic lights is not smart enough, and stability is less high and control is complicated is solved, to guarantee each lane vehicle and answer
The unimpeded operation of anxious vehicle.
The technical scheme is that：A kind of crossroad access lamp control system, including LED digital display tube circuit 1, hair
Optical diode circuit 2 and single-chip microcontroller governor circuit 3；The single-chip microcontroller governor circuit 3 mainly by reset circuit 4, crystal oscillating circuit 5,
Key circuit 6 forms；In the cathode of the light emitting diode D1-D12 of the circuit of LED 2, single-chip microcontroller governor circuit 3
Exclusion RP1, the cathode of the polar capacitor C3 of reset circuit 4, crystal oscillating circuit 5 with the single-chip microcontroller phase in single-chip microcontroller governor circuit 3
Connection, the anode of light emitting diode D1-D12, the anode of the polar capacitor C3 of reset circuit 4 are connected with 5V voltage source, single
One end of the current-limiting resistance R1 of reset circuit 4 in piece machine governor circuit 3, key circuit 6 reset key K1, emergence button
K2, emergence button K3 one end be connected with the single-chip microcontroller in single-chip microcontroller governor circuit 3, the other end is grounded.
The LED digital display tube circuit 1 includes LED digital display tube E1, E2 of two common cathodes；LED digital display tube
The port P0-P7 of LED digital display tube E1, E2 of circuit 1 P0.0-P0.7 with single-chip microcontroller in single-chip microcontroller governor circuit 3 respectively
Port is connected, the port L1, L2 of the LED digital display tube E1 of LED digital display tube circuit 1 respectively with single-chip microcontroller governor circuit
The port P2.0, P2.1 of single-chip microcontroller in 3 is connected, and the port L3, L4 of LED digital display tube E2 is electric with single-chip microcontroller master control respectively
The port P2.2, P2.3 of single-chip microcontroller in road 3 is connected.
The circuit of LED 2 includes the red light emitting diodes D1, D2, D3, D4, four common anodes of four common anodes
Yellow light-emitting diode D9, D10, D11, D12 of green LED D5, D6, D7, D8 and four common anodes；Light emitting diode
The cathode of D1 and D4 interconnects, anode interconnects；The cathode of D5 and D8 interconnects, anode interconnects；D9's and D12
Cathode interconnects, anode interconnects；The cathode of D2 and D3 interconnects, anode interconnects；The cathode of D6 and D7 is mutual
Connection, anode interconnect；D10 and D11 cathode interconnects, anode interconnects；The light-emitting diodes of circuit of LED 2
Pipe D1 and D4, D5 and D8, D9 and D12 are connected with the port P1.5, P1.3, P1.4 of single-chip microcontroller governor circuit 3 respectively, and luminous two
The light emitting diode D2 and D3 of pole pipe circuit 2, D6 and D7, D10 and D11 respectively with P1.2, P1.0 of single-chip microcontroller governor circuit 3,
The port P1.1 is connected.
The single-chip microcontroller governor circuit 3 include reset circuit 4, crystal oscillating circuit 5, key circuit 6, single-chip microcontroller STC89C52,
Exclusion RP1；
The access of the exclusion RP1 is equivalent to LED digital display tube E1, E2 series connection RP1 in LED digital display tube circuit 1
Exclusion, for playing the role of current limliting；
The reset circuit 4 includes：Reset key R, polar capacitor C3, current-limiting resistance R1；The polar capacitor C3's of reset circuit 4
Anode is connected with one end of reset key R and 5V voltage source, one end, the reset of the cathode and current-limiting resistance R1 of polar capacitor C3
The other end of the reset key R of circuit 4 is connected with the port RST of single-chip microcontroller STC89C52, the other end of current-limiting resistance R1 with
Ground is connected, and polar capacitor C3 is used to charge and to the initialization operation of single-chip microcontroller, makes inside single-chip microcontroller each register in one
The original state of a determination；
The crystal oscillating circuit 5 includes：Two ceramic disc capacitor C1, C2, a crystal oscillator X；One end of the ceramic disc capacitor C1 of crystal oscillating circuit 5
It is connected to the ground, the other end is connected with the port XTAL1 of one end of crystal oscillator X and single-chip microcontroller STC89C52, the porcelain of crystal oscillating circuit 5
One end of chip capacitor C2 is connected to the ground, and the other end is connected with the port XTAL2 of the other end of crystal oscillator X and single-chip microcontroller STC89C52
It connects, the temperature drift for opening shake and reducing frequency of C1, C2 as load capacitance, for being more easier；
The key circuit 6 includes：Reset key K1, two emergence buttons K2, K3；The one of the switch key K1 of key circuit 6
End is connected with the port P3.0 of single-chip microcontroller STC89C52, one end of emergence button K2 and the port P3.1 of single-chip microcontroller STC89C52
It is connected, one end of emergence button K3 is connected with the port P3.2 of single-chip microcontroller STC89C52, the switch key K1 of key circuit 6
The other end, the other end of emergence button K2, the other end of emergence button K3 be connected to the ground respectively.
The beneficial effects of the invention are as follows：The passage of in emergency circumstances emergency vehicles mainly can be achieved in the present invention, realizes red green
The countdown of amber light is shown, realizes turn of the normal transformation of crossroad access lamp and four states of 12 traffic lights
It changes, to guarantee the unimpeded operation of each road vehicle.
Detailed description of the invention
Fig. 1 is entire block diagram of the invention；
Fig. 2 is LED the digital display tube E1 and E2 in LED digital display tube circuit of the present invention；
Fig. 3 is part integrated circuit schematic diagram of the invention.
Each label in Fig. 1-3：1- LED digital display tube circuit, 2- circuit of LED, 3- single-chip microcontroller governor circuit,
4- reset circuit, 5- crystal oscillating circuit, 6- key circuit.
Specific embodiment
In the following with reference to the drawings and specific embodiments, the invention will be further described.
Embodiment 1：As shown in Figure 1-3, a kind of crossroad access lamp control system, including LED digital display tube circuit
1, circuit of LED 2 and single-chip microcontroller governor circuit 3；The single-chip microcontroller governor circuit 3 is mainly by reset circuit 4, crystal oscillator electricity
Road 5, key circuit 6 form；Cathode, the single-chip microcontroller governor circuit 3 of the light emitting diode D1-D12 of the circuit of LED 2
In exclusion RP1, the cathode of polar capacitor C3 of reset circuit 4, crystal oscillating circuit 5 with the monolithic in single-chip microcontroller governor circuit 3
Machine is connected, and the anode of light emitting diode D1-D12, the anode of the polar capacitor C3 of reset circuit 4 are connected with 5V voltage source
It connects, one end of the current-limiting resistance R1 of the reset circuit 4 in single-chip microcontroller governor circuit 3, the reset key K1 of key circuit 6, emergency
Key K2, emergence button K3 one end be connected with the single-chip microcontroller in single-chip microcontroller governor circuit 3, the other end is grounded.
Further, the LED digital display tube circuit 1 includes LED digital display tube E1, E2 of two common cathodes；LED number
The port P0-P7 of LED digital display tube E1, E2 of code display tube circuit 1 respectively with single-chip microcontroller in single-chip microcontroller governor circuit 3
The port P0.0-P0.7 is connected, the port L1, L2 of the LED digital display tube E1 of LED digital display tube circuit 1 respectively with monolithic
The port P2.0, P2.1 of single-chip microcontroller in machine governor circuit 3 is connected, the port L3, L4 of LED digital display tube E2 respectively with list
The port P2.2, P2.3 of single-chip microcontroller in piece machine governor circuit 3 is connected.
Further, red light emitting diodes D1, D2 of the circuit of LED 2 including four common anodes, D3, D4,
Green LED D5, D6, D7, D8 of four common anodes and yellow light-emitting diode D9, D10, D11, D12 of four common anodes；
The cathode of light emitting diode D1 and D4 interconnect, anode interconnects；D5 is interconnected with the cathode of D8, anode is mutually connected
It connects；The cathode of D9 and D12 interconnects, anode interconnects；The cathode of D2 and D3 interconnects, anode interconnects；D6 and
The cathode of D7 interconnects, anode interconnects；D10 and D11 cathode interconnects, anode interconnects；Light emitting diode electricity
The light emitting diode D1 and D4 on road 2, D5 and D8, D9 and D12 respectively with the port P1.5, P1.3, P1.4 of single-chip microcontroller governor circuit 3
Be connected, the light emitting diode D2 and D3 of circuit of LED 2, D6 and D7, D10 and D11 respectively with single-chip microcontroller governor circuit 3
The port P1.2, P1.0, P1.1 be connected.
Further, the single-chip microcontroller governor circuit 3 includes reset circuit 4, crystal oscillating circuit 5, key circuit 6, single-chip microcontroller
STC89C52, exclusion RP1；
The access of the exclusion RP1 is equivalent to LED digital display tube E1, E2 series connection RP1 in LED digital display tube circuit 1
Exclusion, for playing the role of current limliting；
The reset circuit 4 includes：Reset key R, polar capacitor C3, current-limiting resistance R1；The polar capacitor C3's of reset circuit 4
Anode is connected with one end of reset key R and 5V voltage source, one end, the reset of the cathode and current-limiting resistance R1 of polar capacitor C3
The other end of the reset key R of circuit 4 is connected with the port RST of single-chip microcontroller STC89C52, the other end of current-limiting resistance R1 with
Ground is connected, and polar capacitor C3 is used to charge and to the initialization operation of single-chip microcontroller, makes inside single-chip microcontroller each register in one
The original state of a determination；
The crystal oscillating circuit 5 includes：Two ceramic disc capacitor C1, C2, a crystal oscillator X；One end of the ceramic disc capacitor C1 of crystal oscillating circuit 5
It is connected to the ground, the other end is connected with the port XTAL1 of one end of crystal oscillator X and single-chip microcontroller STC89C52, the porcelain of crystal oscillating circuit 5
One end of chip capacitor C2 is connected to the ground, and the other end is connected with the port XTAL2 of the other end of crystal oscillator X and single-chip microcontroller STC89C52
It connects, the temperature drift for opening shake and reducing frequency of C1, C2 as load capacitance, for being more easier；
The key circuit 6 includes：Reset key K1, two emergence buttons K2, K3；The one of the switch key K1 of key circuit 6
End is connected with the port P3.0 of single-chip microcontroller STC89C52, one end of emergence button K2 and the port P3.1 of single-chip microcontroller STC89C52
It is connected, one end of emergence button K3 is connected with the port P3.2 of single-chip microcontroller STC89C52, the switch key K1 of key circuit 6
The other end, the other end of emergence button K2, the other end of emergence button K3 be connected to the ground respectively.
The achievable function of the present invention：
(1), when east-west direction is red light, no through traffic for this road vehicle, and thing road pedestrian can pass through；North and south road is green light, this road
Vehicle passes through, and no through traffic by pedestrian.Time is 30 seconds.
(2), amber light flashes 5 seconds, and warning vehicle and pedestrian is red, state of green light will switch.
(3), when east-west direction is green light, this road vehicle pass-through；North and South direction is red light, and no thoroughfare for north and south road vehicle,
Walk.Time is 30 seconds.The big transit time of east-west direction wagon flow is long.
(4), red, green, yellow successively to occur, pedestrian and the smooth passage of vehicle safety.
(5), emergence button K2 is pressed, the LED light of east-west direction becomes red, realizes the emergency function of east-west direction.It presses
Lower emergence button K3, the LED light of North and South direction become red, realize the emergency function of North and South direction.
Specifically, the single-chip microcontroller control workflow of signal lamp of the invention is as follows：
A, firstly, after powering on, initialization and reset work of the reset key K1 realization to whole system of circuit 6 are pressed the button,
Enter original state S0 at this time, passes through single-chip microcontroller STC89C52 the shining to circuit of LED 2 of single-chip microcontroller governor circuit 3
E1, E2 of diode D1-D12 and LED digital display tube circuit 1 are controlled, and what state S1-S4 was circuited sequentially in sequence goes out
Existing, digital display tube E1, E2 show the number of seconds of countdown, ensure pedestrian safety and vehicle it is unimpeded；
Original state S0：Green LED D6, D7 of east-west direction are bright, red light emitting diodes D1, D4 of North and South direction
It is bright；
State S1：Red light emitting diodes D2, D3 of east-west direction are bright, and green LED D5, D8 of North and South direction are bright；
State S2：Red light emitting diodes D2, D3 of east-west direction are still bright, and the green LED D5 of North and South direction,
D8 is knocked out, yellow light-emitting diode D9, D12 flashing；
State S3：Green LED D6, D7 of east-west direction are bright, and red light emitting diodes D1, D4 of North and South direction are bright；
State S4：Green LED D6, D7 of east-west direction go out, and yellow light-emitting diode D10, D11 of east-west direction dodge
Bright, red light emitting diodes D1, D4 of North and South direction are still bright；
B, when east-west direction in case of emergency, press the button the emergence button K2 of circuit 6, the emitting red light two of east-west direction
Pole pipe D2, D3 lights, and emergency vehicle can pass through；When North and South direction in case of emergency, press the button the emergence button of circuit 6
K3, red light emitting diodes D1, D4 of North and South direction are lighted, and emergency vehicle can pass through.
The explanation of the detailed operation principle of circuit of the invention：
LED digital display tube circuit：The LED digital display tube of common cathode accesses circuit, for showing the number of seconds of traffic lights countdown.
The present invention has used P0 and P2 mouthfuls of single-chip microcontroller, is exported using the P0 of single-chip microcontroller mouth as the 10-bit digit of count down time, P2
Units code of the mouth output as count down time.
Circuit of LED：On the vertical crossroad of thing and two direction of north and south, 12 traffic lights are shared, are met an urgent need
Key borrows P3 mouthfuls, for realizing the processing to special circumstances, the traffic display lamp of east-west direction when pressing emergence button K2
Become red light, it is the mark that special car passes through that the traffic display lamp of North and South direction, which becomes red, when pressing emergence button K3.
And the present invention has used the P1 mouth of single-chip microcontroller, connects vertical two road junctions respectively using the P1 mouth (P1.0~P1.5) of single-chip microcontroller
6 signal lamps.
Single-chip microcontroller governor circuit：STC89C52 single chip is the core of traffic light control system, and it is digital to be mainly used to driving
Display tube, the control for realizing the components such as crystal oscillating circuit and light emitting diode.
Reset circuit：By the position RESET of single-chip microcontroller come control system be work or setting initial value, when reset signal be 1
When just system is initialized, system begins to work, and reset key K1 is exactly for realizing the initialization to whole system
With reset work.
Crystal oscillating circuit：As load capacitance, effect is to be easy to open shake and reduce the temperature drift of frequency by C1, C2.
Key circuit：For the present invention it is only necessary to several keyboards, which includes the reset key R of single-chip microcontroller, systems to answer
Position key K1, emergence button K2, K3.
When certain direction green light, setting timer is some numerical value, then with the counting mode work per second for subtracting 1, directly
It is 0 to number is reduced to, four crossway lipstick, green light exchange, one action circulation terminates, into the working cycles in another direction.It is logical
The count down time for programming the lamp for the green three kinds of colors of reddish yellow that thing and the north and south road junction Liang Ge can be set is crossed, which can lead to
Digital display tube is crossed to show.
The time that the traffic lights of four corners of the world four direction occur is：The time that red light occurs is 30 seconds, what green light occurred
Time is 25 seconds, and the time that amber light occurs is 5 seconds.
The single-chip microcontroller internal work process for needing to further illustrate is as follows：In the initial state, i.e., after electrification reset, occur
Thing green light, the bright situation of north and south red light；It is worked normally when the present invention enters, out present condition S1, i.e. thing is red, and north and south is green
Situation；When the present invention is after compiling and running a period of time, state S2 is obtained, i.e., thing is red, the situation of north and south Huang；When this hair
It is bright through amber light warn 5s after, obtain state S3, i.e. thing is green, the red situation in north and south；When the present invention is by compiling and running one section
After time, state S4 is obtained, i.e. thing is yellow, the red situation in north and south；When the present invention through amber light warn 5s after, return to state S1；When
In case of emergency, pressing emergence button K2 can make the lamp of thing both direction redden, and east-west direction emergency vehicles can at this time
Pass through；Pressing emergence button K3 can make the lamp of north and south both direction redden, and North and South direction emergency vehicles can pass through at this time.The invention
The passage for completing the conversion of four states and circulation and emergency vehicles, completes the display of countdown charactron, entire to be
The traffic lights that the method design of system is enough to control crossroad normally converts, and guarantees the unimpeded operation of each road vehicle.
Using single-chip microcontroller as governor circuit：Select single-chip microcontroller STC89C52, by the P0 mouth of the single-chip microcontroller (P1.0~
P1.5 6 signal lamps for) connecting vertical two road junctions respectively are believed by the timer each second of single-chip microcontroller by P1 mouthfuls of conveying traffic
Number information.Igniting for red, green, yellow lamp is shown when P0 mouthfuls of each pin output is low level using common-anode light emitting diode
Situation.The count down time of each lamp ignited is shown with Pl, P2 mouth of STC89C52, the time is controlled by timer, by P1
10-bit digit of the output of mouth as count down time, units codes of the P2 mouthfuls of outputs as count down time, with four numbers
The method of the display Dynamically Announce of pipe is realized.P3 mouthfuls are used to connect emergence button K2, K3, for realizing the place to special circumstances
Reason, traffic lights becomes red light full when by lower switch, indicates that special car passes through.
The situation of change of traffic lights is realized using program：In programming to four different addresses of state assignment come into
Row driving, because the lamp on P1 is lighted with low level " 0 " to drive, specific state address distribution is also different.
Specific embodiments of the present invention are explained in detail above in conjunction with attached drawing, but the present invention is not limited to above-mentioned realities
Example is applied, it within the knowledge of a person skilled in the art, can also be without departing from the purpose of the present invention
Various changes can be made.
Claims (4)
1. a kind of crossroad access lamp control system, it is characterised in that：Including LED digital display tube circuit（1）, light-emitting diodes
Pipe circuit（2）With single-chip microcontroller governor circuit（3）；The single-chip microcontroller governor circuit（3）Mainly by reset circuit（4）, crystal oscillating circuit
（5）, key circuit（6）Composition；The circuit of LED（2）The cathode of light emitting diode D1-D12, single-chip microcontroller master control
Circuit（3）In exclusion RP1, reset circuit（4）Polar capacitor C3 cathode, crystal oscillating circuit（5）It is electric with single-chip microcontroller master control
Road（3）In single-chip microcontroller be connected, anode, the reset circuit of light emitting diode D1-D12（4）Polar capacitor C3 anode it is equal
It is connected with 5V voltage source, single-chip microcontroller governor circuit（3）In reset circuit（4）One end of current-limiting resistance R1, key circuit
（6）Reset key K1, emergence button K2, emergence button K3 one end with single-chip microcontroller governor circuit（3）In single-chip microcontroller phase
Connection, the other end are grounded.
2. crossroad access lamp control system according to claim 1, it is characterised in that：The LED digital display tube
Circuit（1）LED digital display tube E1, E2 including two common cathodes；LED digital display tube circuit（1）LED digital display tube
The port P0-P7 of E1, E2 respectively with single-chip microcontroller governor circuit（3）The port P0.0-P0.7 of middle single-chip microcontroller is connected, and LED is digital
Display tube circuit（1）LED digital display tube E1 the port L1, L2 respectively with single-chip microcontroller governor circuit（3）In single-chip microcontroller
The port P2.0, P2.1 is connected, the port L3, L4 of LED digital display tube E2 respectively with single-chip microcontroller governor circuit（3）In monolithic
The port P2.2, P2.3 of machine is connected.
3. crossroad access lamp control system according to claim 1, it is characterised in that：The circuit of LED
（2）Red light emitting diodes D1, D2, D3, D4 including four common anodes, green LED D5, D6 of four common anodes, D7,
Yellow light-emitting diode D9, D10, D11, D12 of D8 and four common anode；The cathode of light emitting diode D1 and D4 interconnect, are positive
Pole interconnects；The cathode of D5 and D8 interconnects, anode interconnects；D9 is interconnected with the cathode of D12, anode is mutually connected
It connects；The cathode of D2 and D3 interconnects, anode interconnects；The cathode of D6 and D7 interconnects, anode interconnects；D10 and
D11 cathode interconnects, anode interconnects；Circuit of LED（2）Light emitting diode D1 and D4, D5 and D8, D9 and
D12 respectively with single-chip microcontroller governor circuit（3）The port P1.5, P1.3, P1.4 be connected, circuit of LED（2）Shine
Diode D2 and D3, D6 and D7, D10 and D11 respectively with single-chip microcontroller governor circuit（3）The port P1.2, P1.0, P1.1 be connected
It connects.
4. crossroad access lamp control system according to claim 1, it is characterised in that：The single-chip microcontroller governor circuit
（3）Including reset circuit（4）, crystal oscillating circuit（5）, key circuit（6）, single-chip microcontroller STC89C52, exclusion RP1；
The access of the exclusion RP1, which is equivalent to, gives LED digital display tube circuit（1）In LED digital display tube E1, E2 series connection
The exclusion of RP1, for playing the role of current limliting；
The reset circuit（4）Including：Reset key R, polar capacitor C3, current-limiting resistance R1；Reset circuit（4）Polar capacitor
The anode of C3 is connected with one end of reset key R and 5V voltage source, one end of the cathode of polar capacitor C3 and current-limiting resistance R1,
Reset circuit（4）The other end of reset key R be connected with the port RST of single-chip microcontroller STC89C52, current-limiting resistance R1's is another
One end is connected to the ground, and polar capacitor C3 is used to charge and to the initialization operation of single-chip microcontroller, makes each register in single-chip microcontroller inside
The original state determining in one；
The crystal oscillating circuit（5）Including：Two ceramic disc capacitor C1, C2, a crystal oscillator X；Crystal oscillating circuit（5）Ceramic disc capacitor C1
One end is connected to the ground, and the other end is connected with the port XTAL1 of one end of crystal oscillator X and single-chip microcontroller STC89C52, crystal oscillating circuit
（5）One end of ceramic disc capacitor C2 be connected to the ground, the other end and the other end of crystal oscillator X and the XTAL2 of single-chip microcontroller STC89C52
Port is connected, the temperature drift for opening shake and reducing frequency of C1, C2 as load capacitance, for being more easier；
The key circuit（6）Including：Reset key K1, two emergence buttons K2, K3；Key circuit（6）Switch key K1
One end be connected with the port P3.0 of single-chip microcontroller STC89C52, the P3.1 of one end of emergence button K2 and single-chip microcontroller STC89C52
Port is connected, and one end of emergence button K3 is connected with the port P3.2 of single-chip microcontroller STC89C52, key circuit（6）Switch
The other end of key K1, the other end of emergence button K2, emergence button K3 the other end be connected to the ground respectively.
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| CN201810526526.1A CN108831167A (en) | 2018-05-29 | 2018-05-29 | A kind of crossroad access lamp control system |
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Application publication date: 20181116 |