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The LED clock consists of 60 LEDs which are placed circular around a common analog clock. The LEDs are used to display the seconds. Essential part of this circuit is the LED driver MAX7219 from Maxim. A datasheet is available on Maxim s homepage. The clock is controlled by the microcontroller AT89C2051 from Atmel. This microcontroller is clocked at a frequency of 12 MHz from which results a time base of 1 microsecond. Via software dividers one clock impulse per second is generated which is used for updating the LED display.

128KHzID卡读卡模块程序，带模块原理图，曼切斯特解码(128KHzID card reader module program with block diagram, Manchester decoding)

CCS平台PE4302驱动,亲测可用，附带使用程序(CCS Platform PE4302 Drivera,TM4C123GX)

说明：  ad9850的单片机程序，适用于51系列，有用的可下载参考(ad9850 microcontroller program, suitable for 51 series, useful can be downloaded for reference)

基于51单片机的tlc1549的AD采集并显示。(Based on 51 single-chip tlc1549 the AD acquisition and display.)

STM32 CH376 控制USB打印机(STM32 CH376 USB printer)

MMA7455 数字加速度传感器模块使用(MMA7455digital accelerometer module using)

系统平时处于循环接收检测状态，当有按键动作后发送数据 ，对方收到数据后LED闪烁， 任何一方可以发数据也可以收数据。 1． 当检测到按键动作后发送数据，自身LED闪烁 2． 当收到数据后LED闪烁 (Usually in the loop receiver detect state data, send keystrokes LED flashes after receipt of this data, either party can send data can also receive data. 1. When sending data detected keystrokes own LED flashes. LED flashes when data is received)

基于msp430f149单片机，可以同时检查相位，脉宽，周期等信息！(Msp430f149 based microcontroller, you can also check phase, pulse width, period and other information!)

AVR自平衡车主程序，使用ENC-03陀螺仪和MMA7260作为传感器，内含卡尔曼滤波、PID等等(AVR owners of self-balancing process, the use of ENC-03 MMA7260 as gyroscopes and sensors, embedded Kalman filter, PID, etc.)