example

Pocket 2003 Imager_SDK_14.12.20086 for software engineereing.

说明：  本系统采用下位机负责模拟数据的采集,从51单片机负责采集数据，并应答主机发送的命令，上位机即主机是负责处理接受过来的数字量的处理及显示，主机和从机之间用RS-485进行通信。这样用户可以在上位机上编写各种程序对文件中的数据进行有效查询和分析,有利于工业过程的长期正常运行和检查。该系统采用的是STC89C52单片机，此芯片功能比较强大，能够满足设计要求。(In this system, the lower computer is responsible for the acquisition of analog data, and the 51 single chip microcomputer is responsible for collecting data and answering the commands sent by the host computer. The host computer is responsible for processing and displaying the received digital quantity. The communication between the host computer and the slave computer uses RS-485. In this way, users can write various programs on the upper computer to effectively query and analyze the data in the file, which is conducive to the long-term normal operation and inspection of industrial processes. The system uses STC89C52 single chip microcomputer, which is powerful and can meet the design requirements.)

用于描述地下水动力模拟计算，和水体压力，该代码简单容易看明白(water calculator)

说明：  113、基于51单片机老人生理智能监控GSM短信 本设计由STC89C52单片机电路+火焰传感器电路+加速度传感器+心率传感器电路+SIM800A_GSM模块电路+电源电路组成。 该系统实时监测老人是否跌倒，是否周围有火以及心率情况。 1、如果火焰传感器检测到火焰，则GSM向特定手机发送：Fire！ 2、如果ADXL345检测到老人跌倒了，则GSM向特定手机发送：Fall！ 3、如果心率传感器检测到老人心率高于120，则GSM向特定手机发送：High Heart！ 4、注意本设计一次上电上述情况每个只能触发一次上报短信，不会连续发送，防止反复发送，请放心使用。 5、短信处理过程有GSM信号灯指示。 6、GSM模块是SIM800A，该模块和SIM900A电路程序完全兼容外观外形一模一样。(GSM SMS for elderly physiological intelligent monitoring based on 51 MCU This design consists of STC89C52 MCU circuit + flame sensor circuit + acceleration sensor + heart rate sensor circuit + sim800a_ GSM module circuit + power supply circuit. The system monitors whether the elderly fall down, whether there is fire around and heart rate in real time. 1. If the flame sensor detects a flame, the GSM sends: fire! 2. If adxl345 detects that an old man has fallen, the GSM sends a specific mobile phone: fall! 3. If the heart rate sensor detects that the heart rate of the elderly is higher than 120, the GSM sends a message to a specific mobile phone: high heart! 4. Pay attention to the design of a power on, each of the above conditions can only trigger a report SMS, will not be sent continuously, to prevent repeated sending, please rest assured to use. 5. SMS processing process is indicated by GSM signal light.)

说明：  各位C51的爱好者能够看到我的拙作，这离不开龙 啸九天版主的支持，在此，我向他表示感谢，也相信C51BBS会越办越好！(C51 fan you can see my apology, which is inseparable from Long Xiao nine moderator support in this, I thanked him, and believe C51BBS will be better and better!)

本产品是一个具有音量控制的IC。 void I2C_start(void) { EA=0 PTDAT=1 PTSCL=1 SomeNOP() PTDAT=0 SomeNOP() PTSCL=0 } static ...

7128芯片设计原理图，适合3A一下电流的步进电机驱动器设计，非常实用(7128 chip design schematics for what current 3A stepper motor driver design, very practical)

Leave with Rejoin - The stack will attempt once and

这是一个这是一个我收藏的电动感应门的c语言源程序(This is a This is a collection of c language source of electric induction doors)

定时器中断试验的程序源码，经试验调试已完全调试通可以使用(Timer interrupt testing procedures, debugging has been fully debugged by the test can be used through)