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1、循环彩灯论文（Circular lantern paper）This article is contributed by lvhoingDOC documents may experience poor browsing on the WAP side. It is recommended that you first select TXT, or download the source file to the local view.Wuhan Engineering InstituteGraduation project reportDesign Title: hospital name,
2、Department of study: Name: no.:Circular lanternProfessional class: instructor:yearmonthdayWuhan Engineering InstituteCircular lanternAbstract: the eight circuit circuit of colored lantern controlled by power supply is replaced by led. On the electricityUnder the condition of the source input, the 55
3、5 timer starts to work, the 74LS192 decimal counter starts counting, and then the data is distributed by the output of the 74LS138 decoder to control the cycle of the colorful lights to flash in turn. Energy revolving lantern cycle lantern circuit consists of driving circuit, output circuit, clock c
4、ircuit and power supply circuit of power supply for the whole system to provide the required, for each port to provide DC level TTL circuit required more strictly to the electric power source voltage, voltage must be controlled in a certain range. The CMOS circuit is relatively loose in respect of t
5、he power supply voltage. The circuit is made of TTL integrated circuit and powered by 5 volt power supply. The clock circuit is made up of more than 555 harmonic self-excited oscillation integrated circuit, and a resistor and a capacitor together constitute the cycle of a clock cycle generator clock
6、 circuit, provides the clock signal for the circuit, the circuit work support. The drive circuit is composed of 74LS192N counter and 74LS138N three line eight line decoder, used to drive the two drive circuit of light emitting tube work, and let the eight light-emitting diode cycle clock circuit und
7、er control in the. The output circuit is used to finally display the output results, where the eight LEDs are used to cycle under the control output circuit of the drive circuitKey words: 555 timer; 74LS192; 74LS138; LED; capacitance; resistance; power supplyOneWuhan Engineering Instituteorderrecord
8、1. design background. First pages 1.1 social background. First pages 1.2 professional background. First page 2. design. First page 2.1 schematic design. First page 2.2 PCB board wiring and making scheme. Second page 3. program implementation. Second page 3.1 schematic design implementation. Second p
9、age, 3.2 PCB board wiring and make plan implementation. Fifth page 4. results and conclusions. Fifth page 4.1 overall results. Sixth page 4.2 design conclusions. Sixth page 5. harvest and thanks. Sixth pages, 6. references. Seventh pages, 7. accessories. Seventh page 7.1 schematic. . Seventh, 7.2, P
10、CB diagrams. Eighth page 7.3 component list. Article 1.TwoWuhan Engineering InstituteDesign background1.1 social backgroundWith the digital wave sweeping almost all fields. With the rapid updating of electronic products and rapid development of new products, higher requirements for the design of ele
11、ctronic automation (EDA) have been made, and the rapid development of digital technology has been promoted. The design process and methods of digital circuits are also developing and improving. Through this curriculum design is mainly: to understand the basic knowledge of digital circuit, connection
12、 method of integrated basic element learning, to master the basic knowledge of electronic design, and use this knowledge to design revolving lantern. Understand the basic integrated chips and use them to design cyclic lantern circuits according to requirements.1.2 professional background 1.2 profess
13、ional backgroundElectrical engineering and automation is a new subject in the field of electrical information, its tentacles into all walks of life, small to a switch to the design, the space shuttle, has its shadow, has become an important part of the high-tech industry, widely used in the fields o
14、f industry, agriculture, national defense, play a more and more important role in the national economy. Professional reflects weak electricity combining, electrical and electronic technology, the combination of software and hardware combination, with interdisciplinary nature, electric power, electro
15、nics, control, computer multi discipline, so that graduates have a strong ability to adapt, wide caliber professional. And now, our school is in the process of development, has a strong vitality and vitality. In order to enable students to adapt to the development of the times, in the strong support
16、 of the school and the teachers in the Department under the leadership of the times carry out curriculum design, so as to cultivate our independent analysis, with the ability to solve problems, to strengthen the cooperation among students.2. design plan2.1 schematic design1. according to the design
17、requirements of the device to select the 2. design to have 555 consecutive 1-s pulse timer generates 3. to counter 74LS192 and 74LS138 decoder respectively and count data by the decoder to control the distribution of 4. lights cycleThreeWuhan Engineering InstituteThe control loop diagram is as follo
18、wsTimerCounterDecoderDisplay outputFig. 2.1 control cycle diagram5. circuit diagram connection2.2 PCB board wiring and making scheme1.PCB board wiring adopts the combination of automatic routing and manual wiring, so as to realize the wiring correctness. After the 2. wiring is completed, the PCB boa
19、rd outputs the printed 3.PCB board3. program implementation3.1 schematic design of the implementation of the program1. design 555 timers produce 1 second pulse, according to the design requirements, the 555 timer is connected to multivibrator, generate oscillation cycle is 1 second. The circuit diag
20、ram is connectedThe method is shown in Figure 3.1 on the right:Fig. 3.1555 multivibrator circuit designed by timerFourWuhan Engineering InstituteBy formulaQ=R1 + R2 2 =. R1 + 2R2 312 T= - -. (R1+2R2) Cln23 C=0.01F. And because the circuit cycle is 1s, T=1s, that is, frequency f=1Hz, as well as the e
21、quipment restrictions74LS192 is the synchronous decimal reversible counter of R1=R2=51K 2. 74LS192 decimal counter. It has double clock input, and has the functions of clearing and setting numbers. Its pin and logic symbols are as follows:Figure 3.2 74LS192 pin layout and logic symbol(a) pin arrange
22、ment(b) logical symbolsFigure PL: set the number of terminal CPU for counting end CPD by counting the end, TCu is a non synchronous carry output, D TC for non synchronous borrow output, P0, P1, P2, P3 input as counter, MR remove Q0, Q1, Q2, and Q3 data output end. P0, P1, P2 and P3 are respectively
23、connected with the low level, PL, CPD with the high level of MR Q4 by the end of the gate circuit; after connected with Q0, Q1, Q2; and the three output is 0 - 9 of the cycle; three are respectively connected to the 74Ls138N input end for decoding.FiveWuhan Engineering Institute3. 74LS138 function a
24、nd connection method is as follows:16 VCCY0, Y1, Y2, Y3, Y4, Y5, Y6, Y7, OE1, OE2A, OE2B,.Figure 3.3 74LS138 pin functionSix15141312111097 SN74LS138N 8 GNDThe function of 74Ls138N is to translate the three inputs, A, B and C, from one of the eight outputs of the Y0 - Y7. It will connect the 74Ls192N
25、 of Q0, Q1, Q2 three output terminals are respectively connected with the A, B, C three OE2A and OE2B are connected to input end; the end of 74LS192 Q3, the control on state, the OE1 is connected with the high level, 8 pin and 16 pin power supply and grounding respectively. Then the eight output by
26、a Y0 Y7 end of the door drive circuit respectively eight light-emitting diodes. 4. design lights control circuit to output 74LS192 555 timer counter number is the end of the 74LS192 output are respectively connected with the end of the 74LS138, and then the eight 74LS138 output terminals are respect
27、ively connected with the eight lights. The circular lights turn, and all the flashing once, that is the nine state, so the control input E1 74LS138, output Q3 E2 received 74LS192, to realize the nine state of 74LS138 (all bright times).74LS192 is the decimal counter, there are ten output state, so t
28、ake the output of the 74LS192 by the door circuit return control set to achieve the end, when the count to nine, return to start counting from zero. Thus, the cycle control of the circular lantern is completed. With the above two points, you can draw a circuit diagram (see attachment figure 7.1 sche
29、matic).123A B CWuhan Engineering InstituteThe 5. circuit diagram in DXP to complete the drawing of the circuit diagram, and then compile for error correction, know that there is no mistake. After the DXP compiles without error, it is simulated in the software Multisim10. At first, the lights are not
30、 bright, and then ask the teacher before you know, in the back of the light-emitting diode series resistance. If you think you have a series of resistors, the circuit can work as required, but it will still fail to simulate again. After analyzing with other members of this group, we can conclude tha
31、t the 555 timer parameter or the connection method is wrong. After checking and resetting the frequency of the 555 timer and other parameters, we saw that the cycle lights were on. After a patient observation of the simulation process, I learned that the design of the circuit was correct. So far, th
32、e design of the circuit diagram has been completed.Implementation of wiring and making scheme of 3.2PCB board1.PCB board wiring. Before wiring, the components of the circuit diagram are encapsulated in the DXP. In packaging, be careful because there may be multiple packages for the same element. Eac
33、h element is encapsulated in the package according to the type of the supplied element. When the package is complete, import the schematic into the PCB board. After you import the PCB board, re position the components manually so as to minimize the overlap of the lines so as to reduce the non line a
34、ppearance of the wiring. Observe the three view of the component to make sure the package is correct. Set the PCB board routing rules, set the power line and ground wire as: 0.8mm-1mm, the signal line is: 0.5mm welding disk hole: 0.9mm, external hole: 1.5mm. After setting, the first of its automatic
35、 wiring; automatic wiring is completed, there will be a lot of mistakes, again on the components are placed so far, at least until the error; error in wiring, adopt manual wiring or jumper. When the wiring error is zero, the wiring of the PCB board has been completed. The 2.PCB board is made after w
36、iring, print output on the PCB map, and then use the plate plate. When making the board, try not to connect the wires so as not to make the boards out of use. After the board is finished, the board should be drilled and polished until the plate is qualified. 3. welding and debugging, welding and deb
37、ugging process, there are many problems. Welding should pay attention to welding pads can not be connected with other lines, which requires welding must be careful, serious. When debugging, you may not get the result of the simulation, then the normal phenomenon should be considered in all aspects,
38、possibly due to the resistance, capacitance, or the welding problem of the circuit. My main encounter this time is the welding problem, because in the wiring is the use of jumper, in welding did not meet, and improved, completed debugging. Completed the task requirements of the curriculum design.Sev
39、enWuhan Engineering Institute4. results and conclusions4.1 overall resultsAfter two weeks of continuous efforts, but also with the help of teachers and students, the basic completion of the curriculum design tasks. In the process of design, I realized the defects of my own knowledge. Through this co
40、urse design, I fully realized the importance of self-study and the importance of improving independent practical ability. Through this course design, I have deepened my understanding of the importance and practicability of DXP, Multisim10 and other applications, and also improved their ability to us
41、e it. At the same time, I also realized that I have a lot of inadequacies, and later I have a lot to learn, and I will work harder in the future. Due to the limitations of the knowledge level, there may be some shortcomings in the design. I sincerely hope that the teacher will give guidance.4.2 desi
42、gn conclusionsThe course design of several electrical courses, we design the circular lantern process is not too ideal, the whole process is not smooth enough, thinking is not agile enough, really spent a lot of thought. Eight lights and lights, although all meet the requirements of a bright, but th
43、e time interval is not a second. I think there are several reasons, first, the basic knowledge is not very good, some places lack of awareness; second, the application software of the master skilled enough to lead to the template design many laborious; third, the combination of knowledge and practic
44、e is not enough skilled. Fourth, mainly due to the limitations of the components, not fully meet the requirements of the device, resulting in the final time interval is not one second. In the design process also encountered many problems,For example, DXP applications in various aspects, as well as s
45、ome of the wrong correction when drawing, as well as the simulation software in the market problems encountered solutions. The wiring board in the PCB process, I feel the most, one is practical and convenient DXP software, avoid the manual wiring time-consuming and error; on the other hand, the wiring is a patient and slow living, not anxious to complet