PICDoorbell

51单片机运用PCF8591实现数模莫属转换（i2c协议） 1利用PCF8591 串行A/D 转换器转换电位器输入模拟电压，并在LED数码管上显示电压值（精确到2 位小数），实现数字电压表功能。 2在基本部分基础上，利用 PCF8591 的D/A 通道实现一个固定频率的方波（频率范围10~50Hz），并在虚拟示波器上输出。(51 MCU using PCF8591 to realize the digital to analog conversion (I2C) is 1 using PCF8591 serial A/D converter to convert the input analog voltage potentiometer, and in the digital tube LED display voltage values (accurate to 2 decimal places), the realization of digital voltage meter function. 2 in the basic part of basis, the realization of a fixed frequency Fang Bo using D/A channel PCF8591 (10~50Hz frequency range), and the output in a virtual oscilloscope.)

As the figure above illustrates, a phase accumulator compares the sample clock and desired frequency to increment a phase register. Again, the fundamental idea is that we can generate signals with precise frequencies by generating an appropriate sample based on the phase of that frequency at any point in time. In addition, by representing our waveform with 214 (16,384) points, we are able to represent exactly 16,384 phase increments with our lookup table.

Web Service Program

面向51单片机的复杂流水灯实验的c语言程序(The complexity of water for 51 single-chip light experiment c language program)

main.c已详尽注释连接的引脚 和 调试助手参数。STM32分别以串口,硬件SPI,模拟并口驱动CH395,4个socket连接, 原路返回上位机发送的数据。串口模式支持更改工作波特率，硬件SPI速率最高36MHz, 模拟并口较快，这三种模式支持在stm32任意型号下。(Main.c has commented on pins and debugging assistant parameters in detail. STM32 drives CH395 and 4 sockets by serial port, hardware SPI and analog parallel port respectively, and returns the data sent by the host computer in the original way. Serial mode supports changing working baud rate. Hardware SPI rate is up to 36MHz and analog parallel port is fast. These three modes support any model of stm32.)

用STC12C5A60S2控制显示屏LCD12864显示字符、图案、汉字。(Using STC12C5A60S2 contral LCD12864 to display pictures,chineses and words.)

在个是AVR的PDF介绍，内容很详细，也很好，特别适合初学者入门的学习(Here is the introduction of PDF of AVR, which is very detailed and very good. It is especially suitable for beginners to learn.)

《单片机C语言程序设计实训100例——基于8051+Proteus仿真》案例压缩包 第 03 篇 综合设计 25 用ADC0808设计的调温报警器(" Microcontroller C Programming Language Training 100 cases- based on 8051+ Proteus simulation," Case No. 03 compressed package integrated design 25 designed thermostat with alarm ADC0808)

For C8051F330 This code example illustrates using the internal analog multiplexer to measure analog voltages on up to 8 different analog inputs. Results are printed to a PC terminal program via the UART.

程序为STM32 串口UART 使用DMA方式收发数据的实践(how to read data on UART by using DMA when number of bytes to receive is not known in advance.)