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Emc of Inverters in Low Power Wireless Technology Environment Within Globally Unlicensed 5 GHZ ISM Short-Range Radio Frequency Band

sim900a gprs上传数据，51单片机c语言源程序(sim900a gprs upload data, 51 c language source)

说明：  基于单片机的电阻测量系统，带vb上位机控制和显示同时还有无线发射(MCU-based resistance measurement system with vb PC control and display as well as a wireless transmitter)

使用485向外发送0-255的数字。 若开发板的485接收到256个字节数据，会把数据以16进制形式打印出来。(Use 485 to send out 0-255 digits. If 485 of the development board receives 256 byte data, the data will be printed in 16 form.)

瑞萨公司UPD78F1814UART程序，有基本的收发操作，可与上位机通信。(Renesas UPD78F1814UART procedures, basic send and receive operations, with the host computer communication.)

说明：  本程序可实现基于51单片机的电子秤数据采集、滤波、显示功能。 称重范围：0-1000g 分辨率： 0.1g 测试精度：0.2g 设计架构：采用弹性悬臂梁贴应变片的传感器结构，应变片采用全桥连接。电桥输出经AD芯片发送给微处理器，微处理器经过数据处理后显示。(This program can realize the functions of data acquisition, filtering and display of electronic scale based on 51 single chip computer. Weighing range: 0-1000g Resolution: 0.1g Testing accuracy: 0.2g Design framework: The sensor structure of elastic cantilever beam with strain gauge is adopted, and the strain gauge is connected by full bridge. The output of the bridge is sent to the microprocessor by AD chip, and the microprocessor is displayed after data processing.)

说明：  I2C_SHT21 温湿度传感器测量 I2C 读取SHT21 温湿度传感器 SHT21驱动库有两种操作模式，适合不同操作 自动转换测量模式： 1：启动任意一个测量指令,例如测量温度执行 measureT(); 2：延时200ms 3：读取测量后的数值, autoMeasure(float * th); 该函数读取测量得出的数据，并根据数据的类型进行转化，再自动启动下一个类型的测量 指定转换测量模式： 1：先启动一次测量,例如测量温度执行 measureT(); 2：延时200ms 3：读取测量后的数值,例如读取温度执行readT();(2C_ SHT21 temperature and humidity sensor measurement I2C read SHT21 temperature and humidity sensor SHT21 driver library has two operation modes, which are suitable for different operations Automatic conversion of measurement mode: 1: Start any measurement command, for example, measure the temperature and execute measure(); 2: Delay 200ms 3: Read the measured value and Automeasure (float * th); This function reads the measured data, converts it according to the data type, and then automatically starts the next type of measurement Specify the conversion measurement mode: 1: Start a measurement first, for example, measure the temperature; 2: Delay 200ms 3: Read the measured value, for example, read the temperature and execute readt();)

实验方法: 1写flash 烧flash的时候采用默认的配置 2然后在JTAG方式下面调试 按key1 key 2 3 4 发光管亮灭(Experimental methods: 1 write flash burn flash when using the default configuration of 2 and then in the JTAG debug mode by following key1 key 2 3 4 LED light out)

TCS3200D光感及顏色偵測IC 三顆偵測不同位置光源副程序源碼(TCS3200D sense of light and color detection IC three detect the different position of deputy program source code)

source code for Ethernet logic