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S-35390A是可以在超低消耗电流、宽工作电压范围内工作的2线CMOS实时时钟IC。工作电 压为1.3 ~ 5.5 V、可适用于从主电源电压到备用电池电压的宽幅电源电压。通过0.25 μA的计 时消耗电流和宽范围的计时电源电压，可大幅度地改善电池的持续时间。在使用备用电池工 作的系统中，内置的自由寄存器可作为用户备用存储器来使用。在主电源切断前存储在寄存 器中的信息，可在电压恢复后的任何时候读出。 本产品因为内置了时钟校正功能，所以可以在很宽的范围内校正因振荡电路的频率偏差所导 致的时钟数据的提前或滞后。通过此功能和温度传感器的结合，可根据温度变化来对时钟进 行校正，从而实现不受环境温度影响的高精度的计时功能-err

简易数字电压表可以测量0-5V范围的8路电压值，并在4位LED数码管上轮流显示或单路选择显示。-Simple digital voltage meter can measure the range of 0-5V Voltage road 8, and 4 digital tube LED display on a rotational basis or choose to display a single road.

本源码实现了在下位机上对室内温湿度的监控，对外接设备电压欠压的监控，以及室内火警监控-Realize the source of the next-bit machine on the indoor temperature and humidity controls, external voltage under-voltage monitoring and control equipment, as well as the indoor fire monitoring

MS-51 高级应用程序库，欢迎各位大虾下载交流分享，望多多上传，资源共享-MS-51 high-level application library, to welcome you to download the exchange of shrimp to share, hope lot of uploading and sharing resources

在电子技术中，频率是最基本的参数之一，又与许多电参量的测量方案、测量结果都有十分密切的关系，因此频率的测量就显得更为重要。测量频率的方法有多种,其中电子计数器测量频率具有精度高、使用方便、测量迅速，以及便于实现测量过程自动化等优点，是频率测量的重要手段之一。在本次毕业设计中我们选择使用单片机来制作数字频率计，并在实际制作中采用了直接测频法。利用延时产生的时基门控信号来控制闸门，通过在单位时间内计数器记录下的脉冲个数计算出输入信号的频率，最终送入LCD中显示。这样制作出来的频率计不仅可以满足设计题目的参数要求，而且具有了单片机的稳定性和成熟性，且控制能力强，是一种低成本，高可靠的设计方案。-In electronic technology, the frequency is one of the most basic parameters, but also with a number of electrical parameters of the measurement program, the measurement results have a very close relationship between the frequency of measurement, therefore it is even more important. Measurement of the frequency of a number of means, electronic measurement of the frequency counter with high precision, easy to use, rapid measurement, and measurement is easy to realize the advantages of process automation is an important means of measuring the frequency of one. Graduates in this design we have chosen to make use of single-chip digital frequency meter, and used in the actual production of a direct

无线传感器网络-构建与协议,讲解无线传感器网络的主要构建及各层的协议实现.-Wireless sensor networks- Construction and agreement, on wireless sensor network to build and realize the agreement on each floor.

近来自己做了温度计,MCU芯片是51的, 温度芯片是DS18B20,显示屏是3310.-Recently own a thermometer, MCU chip is 51, temperature chip DS18B20, the screen is 3310.

SD卡方面的东东,希望对大家有所帮助,呵呵, 我为人人,人人为我

MEGA8做的USB下载线(AVR/51),能下载ATMega系列S51/S52单片机,包括PCB图-MEGA8 make the USB download cable (AVR/51), can be downloaded S51/S52 ATmega series microcontroller, including the PCB diagram

MAX197 ADC程序,用在一个项目上的,思想很清晰-MAX197 ADC procedures used in a project on the ideological and very clear