Hi_H.264_DEC_SDK_V2.2.5.0

单片机开发系统演示程序 - PS2 键值显示，1位数码管显示键码 (Microcontroller development system demonstration program- PS2 key display, a digital display key code)

MCS-51IO口模拟SPI读24位ADC（ADS1252）(MCS-51IO SPI port analog read 24 ADC (ADS1252))

滤波器广泛应用于数字信号处理、通信、自动控制领域,但设计可变宽频带有源滤波器则比较困难。利用单片机控制参数可编程的双二阶通用开关电容有源滤波器,精确设置有源滤波器的中心频率f，品质因数Q及有源滤波器的工作方式。本系统主要分为两个部分:即程控滤波器和程控放大器。程控放大器电压增益为40dB，通过单片机控制DA进行分压，可精确实现要求的10dB步进，误差小于0.5 ，通带为100Hz-500KHz，输入电压峰－峰值范围为10mV，在输入范围内无明显失真。由MAX264为核心的滤波器，可设置为高通、低通滤波器。通过单片机直接给出控制频率，使-3dB截止频率在1KHz-20KHz内可调，步进1KHz，误差小于1 。整个系统以52单片机为控制核心，电路简单，性能稳定，且具有较高精度，滤波参数调节通过单片机控制，较为方便。(Filters are widely used in digital signal processing, communications, automatic control area, but the design variable wideband active filter is more difficult. Control parameters using single-chip programmable universal switched-capacitor biquad active filter, active filter accurately set the center frequency f, quality factor Q and the active filter works. The system is mainly divided into two parts: the program-controlled filters and programmable amplifiers. Programmable amplifier voltage gain of 40dB, the DA through the partial pressure of single-chip control, can accurately achieve the required 10dB step, the error is less than 0.5 , passband to 100Hz-500KHz, input voltage peak- the range of 10mV, the input range no significant distortion. By the MAX264 as the core of filter can be set to high pass, low pass filter. Given directly by the microcontroller controls the frequency, the-3dB cutoff frequency at 1KHz-20KHz adjustable, step 1KHz, error is less than 1 . The entire system for)

说明：  AD7190 STM32 差分电路完成电子秤软件开发；(ctronic balance/scale AD7190)

电子技能大赛CT107D配套程序，写得还算比较规范的，供大家参考(E-Skills Competition CT107D matching program)

实现电子钟功能 ，可设置闹钟，有闹铃，可设置时间和闹钟时间(Implement electronic clock function, can set the alarm clock, alarm clock, can be set up time and clock time)

采用51单片机编写MP3程序，能自由播放音乐，非常有用(MP3 program written using 51 single, free to play music, very useful)

说明：  单片机接口8255控制输出，包括单片机电路仿真图、C程序设计代码(MCU interface 8255 control output)

以PIC16F713为主控的搅拌机底层控制软件，实现了马达的速度闭环控制，以及过流保护(In PIC16F713 as a master blender floor control software, and the speed of the motor closed-loop control, and overcurrent protection)

按键控制STM32单片机输出PWN波占空比和频率可调(Key control STM32 MCU output PWN wave duty cycle and frequency adjustable)