打地鼠终极版

YL_3串行数码管显示时钟，74HC595，8位，显示时分秒，自动计数。(YL_3 serial digital display clock, 74HC595, 8 bit display minutes and seconds, automatic counting.)

使用led和1602显示时间日期和当前环境温度。温度采集使用开发板载传感器。(Led and display time using the 1602 date and the current ambient temperature. Temperature Acquisition using the development of on-board sensors.)

单片机播放 音乐 是学习的好资料 音频学习

说明：  stm32f7采集一遍往外打点一遍用AD采点然后将采样值返回给电脑(Stm32f7 collects points from outside once, uses AD to collect points, and then returns the sampled values to the computer.)

PCA或Timer做软件PWM最高精度到16位(PCA or software Timer do the highest accuracy to 16-bit PWM PCA or software PWM Timer do the highest accuracy to 16)

德卡D8读卡器C#测试程序，用于测试与D8读卡器的通信，实现了读卡器的初始化，蜂鸣，密码校验和读写卡操作。(A test program for D&C s D8 card reader, it is used to test the communication with the D8 reader, and it has achieved the operation of the Initialization, beep, password checking reading and writing of the card reader.)

BH1415F调频台控制C程序,使用keil C51,使用AT89C52单片机，12MHZ晶振，用共阳四位LED数码管,P0口输出段码，P2口扫描(C FM BH1415F control procedures, the use of keil C51, using AT89C52 single-chip, 12MHZ crystal, with a total of four-yang LED digital tube, P0 port output above code, P2 I scan)

按键0中断实现,单片机内 资源的实现计算(a key interrupt to 51 MCU)

用TLC2543采集模拟电压，用LCD1602来显示模拟电压值，用89C52来处理数据.附带Proteus仿真(TLC acquisition analog voltage LCD1602 display analog voltage value to process the data with 89C52)

本次设计的数控直流电阻箱主要由恒定电流源部分、显示部分、键盘部分、电源部分组成。以STM32单片机为核心控制恒流源，恒流源电路由达林顿三极管、高精度运算放大器、采样电阻等组成。通过键盘输入给定值，经D/A转换器将数字信号转换为模拟信号，控制电流。采用电流反馈电路控制精度，经多次调试改进，实现了直流电阻箱的功能。本次设计的数控直流电阻箱较以往的电阻箱相比，其优点在于可操作性强、精度高、体积小、高效节能等优点。适用于作为直流负载的应用场合。(The numerical control DC resistance box designed mainly consists of constant current source part, display part, keyboard part and power supply part. The constant current source is controlled by STM32 single chip microcomputer. The constant current source circuit is composed of Darlington transistor, high precision operational amplifier and sampling resistor. Through the keyboard input a given value, the D/A converter converts the digital signal into analog signal to control the current. The control precision of the current feedback circuit is improved, and the function of the DC resistance box is realized through many debugging improvements. Compared with the conventional resistance box, the designed DC resistance box has the advantages of strong operability, high accuracy, small size, high efficiency and energy saving. It is suitable for application as DC load.)