Design tasks: A total of four lanterns, respectively, to achieve three processes, constitute a cycle of 12 seconds; The first process requires four lights to light up in turn, for a total of 4 seconds; the second process requires four lights to go out in turn, for a total of 4 seconds, before the first light is extinguished;
(1) According to the design requirements, determine the design of the circuit, primary circuit components, set parameters.
(2) Simulation analysis, measurement circuit related parameters, modification, review, so that it meets the design requirements, listed debugging steps.
(3) Comprehensive analysis and calculation of circuit parameters, verification to meet the design requirements, draw the total structure block diagram and logic circuit diagram, briefly describe the working principle of each part, conscientiously complete the design report. With the improvement of people's living standards, everyone's living environment is also constantly improving and beautifying. Busy day in the past, people tend to go to entertainment places to relax. The arrival of the festival, the City of Lights, the organization of programs to celebrate the arrival of the festival. LED lanterns because of its rich lighting color, low cost and simple control and other characteristics and has been widely used, with lanterns to decorate the streets and urban buildings has become a fashion, lanterns as a landscape, installed in the appropriate place of the building is as a decoration to add a festive atmosphere, the second is to have a role in advertising publicity, It can also be used on the stage to enhance the party lighting effect.
Through the lantern controller can control the lantern show a different process, to achieve the desired decorative role. The digital circuit method is used to realize the four-bit bidirectional universal shift register and four light-emitting diodes. The signal generator adopts pulse generator. Used to provide a frequency as a clock signal; a four-decimal divider to frequency the clock signal to generate a clock signal; a three-decimal beat controller to generate a control signal for the beat cycle; and a beat program actuator to complete the system action at each beat, that is, the left, right shift, clear 0, and send number functions of the data.
Can be completed by bidirectional shift register; The light circuit completes the system cycle demonstration, here uses the LED simulation. This design of the controller through the digital circuit control, its small amount of devices, simple circuit, easy to operate, can be widely used in the family, hotels, ballrooms, theatres, advertising and other fields, greatly enriched the modern social life, in today's society, lanterns have become a part of our lives,
To bring us visual enjoyment at the same time can also beautify our lives.
LED lanterns because of its rich lighting color, low cost and simple control and other characteristics and has been widely used, with colored lights to decorate the streets and urban buildings has become a fashion, in order to allow lanterns to achieve the desired decorative role, it is necessary to a simple and practical color lamp controller. The digital circuit method is used to realize the four-bit bidirectional universal shift Register 74ls194 and four light-emitting diodes. The signal generator uses a pulse generator to provide a clock signal with a frequency of 1Hz, and the Quad frequency divider will have a 1Hz clock signal four divider, resulting in 0. 25Hz (i.e. 4S) clock signal; three-way beat Controller to produce 3 beat cycle control signal; Beat program actuator to complete the system action at each beat, that is, the data left, right shift, clear 0 and send number function, can be completed by bidirectional shift register 74ls194; lighting circuit to complete the system cycle demonstration, LED simulations are used here. The circuit is designed to achieve three processes: four lights lit in turn, a total of 4 seconds; extinguished in turn, a total of 4 seconds, first lit after the extinction; four lights at the same time lit out, a total flash 4.
This controller can display a variety of lanterns and is convenient and simple. The design is simulated on Proteus simulation software, and the correctness and validity of the design method are verified, and the technical performance meets the design requirements.
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