Timer 0 overflow interrupt the experiment, based on the AVR MCU Experimental pro...

内容： 1、试验目的：了解按键的扫描原理 2、实现现象：同时按键抢答，先按的键有效，其他按键锁死 复位后重新开始抢答 3、硬件要求：按键 LED灯 原理：最先按下按键者有效，其他均无效-Contents: 1, test Objective: To understand the key principles of scanning two to achieve phenomenon: the key to answer in the same time, press the key and effective, other key-lock reset and re-start to answer in 3, the hardware requirements: button LED lights principle: first press the keys are valid, others are null and void

这是一个很好的学习工程，对于初学都是一个难得的好资料，完整！-This is a good learning project for the beginner is a rare good information, complete!

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超声波测距 利用 送接受的时间 差计算得到距离-Ultrasonic Ranging acceptable use to send the time difference calculated by the distance

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带T6963C控制器的LCD的驱动程序和简单的显示测试程序-T6963 controller with the LCD driver, and the simple test procedure shows

按键扫描 51单片机加8279 8279通过74LS 138译码器扩展4×4键盘、6位显示器。 由3-8译码器对SL0～SL2译出键扫描线，由另一3-8译码器译出显示器的位扫描线，并采用了编码扫描方式。 为了防止出现重键现象，扫描输出线高位SL3不参加键扫描译码。CPU对8279的监视采用了查询方式，故8279的中断请求信号IRQ悬空未用。 -Scan button 82,798,279 plus 51 single-chip decoder 74LS 138 through the expansion of 4 × 4 keyboard, the display 6. From 3-8 decoder SL0 ~ SL2 translated to the key scanning line, by another 3-8 decoder translated display scan line, and uses code scanning. In order to prevent the emergence of the phenomenon of re-key, scan the output line does not take part in high level SL3 scan decoding keys. CPU on the 8279 surveillance using the query mode, the 8279 interrupt request signal IRQ left unused.

名称：独立按键 公司：上海浩豚电子科技有限公司 编写：师访 日期：2009.5 修改：无 内容：切换到独立按键模式，通过按键在数码管显示对应的数字-Name: Independent keys Company: Shanghai Electronic Technology Co., Ltd. Hao dolphin prepared: Teachers Visit Date: 2009.5 Review: No content: Switch to the independent button mode, key in the digital tube display by the corresponding number