基于单片机的八路智能抢答器的毕业设计(4)

Key input module in 14 key, divided into vies to answer first keys and control buttons. Vies to answer first key there were eight, respectively, for vies to answer first S8 S1-players use vies to answer first; Control key has six, respectively, among them--S14 S9 S9 and S10 are "vies to answer first time to adjust key" and "answer time to adjust keys"; S11 and S12 respectively for time "add 1" and "minus 1" button; S13 and S14 are "vies to answer first start button" and "stop" button. Display module the system USES four were LED digital display, anode tube a digital works to display the player to vies to answer first, number two used to display the countdown, a time of unused digital tube as the expansion of the later use. The clock and reset clock circuit module includes and reset circuit, microcontroller the clock signal used to provide all kinds of operation of single chip in the benchmark, reset operation time is of circuit chip in to make SCM initialize, from a certain initial state began to run. Alarm module in the system for additional module, its main use is a tip and draw people's attention. Power supply module is raised to the system design and extensive application of the module, it is the main task of the 220 V ac voltage conversion for dc system can directly use of the stability of the dc + 5 V.

This design limited the number of eight, vies to answer first vies to answer first process is as follows: when the host to press the "start" button vies to answer first, digital display shows vies to answer first time countdown, and in the last five second start alarm circuit hint, in vies to answer first time eight players in the process vies to answer first, after the success display module, vies to answer first demonstrated contestant number and answer the question time. To answer the question, can press the "stop button host, a new round of vies to answer first began to end". If the host did not press the "start" button and contestant vies to answer first vies to answer first, it shall be regarded as the foul, display module shows "FF" and demonstrated contestant number, and alarm circuit hints. According to "stop button" host, a new round of vies to answer first began after. Display module in the initial display, exceed the prescribed vies to answer first time still no contest and the answer in excess of the prescribed time shows "FFF". Vies to answer first time and answer problem of time can set, set a range of 1-99 s, original state vies to answer first time for 10 s and answer the question time for 30 s. Backstage host can "vies to answer first time to adjust key", "answer time to adjust key and time" add 1 ", "minus 1" button modify vies to answer first time and player answer problem of time after time, change "stop button" certain that the new time to start the effective.

In the design process, vies to answer first do first overall scheme, and then analyses the argument for the working principle of the system, and based on this, the design of unit of the circuit principle diagram, further to the design of the system to complete the circuit. In the

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