680-sch-3

蜂鸣器发生实验，c语言编写，内容为音乐梁祝，蜂鸣器电路可以自制。(the speaker code )

STM32 ADC,所用的是神舟开发板，STM32芯片是STM32F107VCT6(STM32 ADC，the STM32 micro core is STM32F107VC)

ADC0通道采集电压以波形形式显示到2.8寸TFT触摸液晶屏上，ADC输入管脚为60管脚(ADC0 channel acquisition voltage to waveform display to the 2.8-inch TFT touch LCD screen, ADC input pin for the 60-pin)

DC-DC直流稳压变换 开关电源 multisim 开关电源 设计 boost uc3842multisim 开关电源 设计 boost uc3842multisim 开关电源 设计 boost uc3842(DC-DC switching power supply DC transform boost uc3842multisim multisim switching power supply switching power switching power supply design boost uc3842multisim boost uc3842)

digital counter "3 digit UpDown 16f84"

在stm32下的AD9834驱动，功能完好可用(The AD9834 driver under STM32 is fully functional and available)

SIM卡电话本读写方案，了解SIM文件系统和外部接口的实战方案，采用EMC915芯片实现。(SIM card phone book reader program, to understand SIM file system and the external interface of practical solutions, using EMC915 chip.)

说明：  keil5 k60固件库的按键扫描程序，为了方便大家学习，主要是方便以后查看 keil5 k60固件库的按键扫描程序，为了方便大家学习，主要是方便以后查看(keil5 k60Firmware Library)

LCD显示18b20采集的温度，并且可以手动调整报警温度(LCD display 18b20 acquisition of temperature and can be adjusted manually alarm temperature)

说明：  stm32f103测正弦波、方波的波形频率。(Measurement of waveform frequency by STM32F103.)