51 microcontroller digital voltmeter source code, electronic locks design code, frequency meter source code

020、数字钟﹝★﹞.doc
021、 拉幕式数码显示技术.doc
022、 电子琴.doc
023、 模拟计算器数字输入及显示.doc
024、8X8 LED点阵显示技术.doc
025、点阵式LED“0－9”数字显示技术.doc
026、点阵式LED简单图形显示技术.doc
027、ADC0809A_D转换器基本应用技术.doc
028、数字电压表.doc
029、两点间温度控制.doc
030、四位数数字温度计.doc
031、6位数显频率计数器.doc
032、电子密码锁设计.doc
033、4×4键盘及8位数码管显示构成的电子密码锁.doc
034、带有存储器功能的数字温度计－DS1624技术应用.doc
035、DS18B20数字温度计使用.doc
016、定时计数器T0作定时应用技术（二）.doc
017、99秒马表设计.doc
018、“嘀、嘀、……”报警声.doc
019、“叮咚”门铃.doc

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