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说明：  MAX7221控制数码管动态显示的单片机C语言源程序，对初学者很有帮助(The MAX7221 Control single-chip digital control dynamic display C language source code, useful for beginners)

主控为51单片机，采用DS18B20测量温度，LCD1602实时显示温度，并通过NRF24L01无线传输模块将测得的温度传输到接收端，

A Comparison of Ladder, Series, and Shunt Type Stepped Attenuators

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.)

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)

十天学会单片机和C语言编程Lesson8(Ten days learn microcontroller and C programming language Lesson8)

stm32硬件i2c，从机i2c，调试通过好用(Stm32 hardware i2c, the plane i2c, debugging through the use of good ~~~)

stm32与fpga进行spi通信，fpga进行测频，占空比，时间间隔测量，32可控制其运行模式，并将测得结果于lcd上进行显示。(STM32 communicates with FPGA in spi. FPGA measures frequency, duty cycle and time interval. 32 can control its operation mode, and display the measured results on lcd)

The IPv4 broadcast address, or null for IPv6.

这是单片机的一个非常好的一个资料，大家可以参考一下，单片机是个非常有用的入门级的，以后学ARM就非常简单了！学单片机最重要的就是看芯片资料(This is a very good single-chip data, we can refer to the microcontroller is a very useful entry-level, after school ARM is very simple! The most important thing is to learn microcontroller chip information see)