NiC_PFC

本系统以直流电流源为核心，AT89S52单片机为主控制器，通过键盘来设置直流电源的输出电流，设置步进等级可达1mA，并可由数码管显示实际输出电流值和电流设定值。本系统由单片机程控输出数字信号，经过D/A转换器（AD7543）输出模拟量，再经过运算放大器隔离放大，控制输出功率管的基极，随着功率管基极电压的变化而输出不同的电流。单片机系统还兼顾对恒流源进行实时监控，输出电流经过电流/电压转变后，通过A/D转换芯片，实时把模拟量转化为数据量，再经单片机分析处理， 通过数据形式的反馈环节，使电流更加稳定，这样构成稳定的压控电流源。实际测试结果表明，本系统输出电流稳定，不随负载和环境温度变化，并具有很高的精度，输出电流误差范围±5mA，输出电流可在20mA~2000mA范围内任意设定，因而可实际应用于需要高稳定度小功率恒流源的领域。(the system to DC current source to the core, MCU AT89S52 main controller, through the keyboard to set up DC power supply output current, set up to 1mA Stepping grades, digital control can be shown by the actual output current value and current setting. The system consists of programmable microcontroller digital signal output, after the D/A converters (AD7543) analog output. After Operational Amplifiers isolation, amplification and control of the output power base. With the power of the base voltage changes in the output current. SCM system also takes on the constant current source for real-time monitoring, after current output current/voltage changes, the A/D converter chip, real-time conversion from analog to the volume of data and then analyzed by the MCU, through data link in the )

ns2_zigbee ========== Performance evaluation of Zigbee based on NS2 This repositories includes the codes of my undergraduate thesis. 1. zigbee.scn: network topology in 3D 2. zigbee.tcl: network script written in tcl 3. thr_drop_delay.awk: eualuation script written in awk 4. data: results of delay, throughput, jitter, and packet loss rate 5. out: figures of results 6. demo: demos of nam 7. thesis How to 1. make sure zigbee.scn and zibee.tcl are in the same folder 2. cd to the folder by terminal 3. run ns zigbee.tcl 4. run awk -f thr_drop_delay.awk zigbee.tr 5. run gnuplot xxx.dat

基于温度传感器DS18B02的应用程序，并在数码管显示，简单易懂。(Temperature sensor DS18B02 based applications, and digital display, easy to understand.)

stm32f103zet6 使用freertos，在IAR平台下开发，静态任务(stm32f103zet6 freertos)

energy power IC. using this file to configuration for RN8209 chip

STC单片机实现0.96OLED SPI接口驱动，方便初学者(STC MCU realizes 0.96OLED SPI interface driver, which is convenient for beginners.)

基于S3C44B0芯片,在显示屏上显示字体的源程序(S3C44B0 based chips, on the screen shows the source fonts)

cortex m3系列，LM3S8962中文资料。是初学M3的好助手(cortex m3 datasheet of chinese.)

该程序是基于NXP公司的LPC1788芯片控制程序，功能较多，用到了周立功公司的ZLG/GUI，有多个不同用途的A/D采集程序，RTC日历程序，文件系统、数据存储程序等，大家可以看。(The program is based on NXP s LPC1788 chip control procedures, more functional, used the week Ligong ZLG/GUI, there are a number of different uses of A/D acquisition program, RTC calendar program, file systems, data storage procedures, we can look at.)

STM32F103 增量式编码器计数，通过串口打印(STM32F103 Incremental Encoder Counting, Printed through Serial Port)