环境参数测量系统

a very buggy code a awesome microcontroller. with this code is possible do nothing since it dont work with any cpu

说明：  51单片机控制的超声波测距程序，内含一个步进电机驱动，可以驱动步进电机改变方向，画好了pcb板(The ultrasonic ranging program controlled by single chip microcomputer contains a stepping motor driver, which can drive the stepping motor to change direction and draw the PCB board)

1、proteus 仿真 1602 与IIC总线形式的EEPROM 2、内含KEIL 工程源文件（C语言） 3、内含proteus 源文件 (Proteus simulation 1602 form IIC bus EEPROM contains the KEIL engineering source files (C language) 3, containing proteus source file)

PID控制,包括算法,控制阶梯列表,算法步进(PID control, including algorithms, control ladder list, the algorithm step)

时钟显示,在实验二的作业里面，希望对大家有用，能够帮助到大家(show the time.)

MICROCHIP 单片机PIC18F87K22，SST25VFxx_Flash存储测试程序，摘自网络,亲自验证有效。(MICROCHIP microcontroller PIC18F87K22 SST25VFxx Flash storage test procedure, the network, personally verified effectively.)

STM8 固件库实现PC，PE口外部中断(STM8 firmware library implements PC, PE port External interrupt)

取键盘指示灯状态源码，例程程序调用API函数实现取键盘指示灯状态。(Take the keyboard LED status source , routine program calls API functions take keyboard LED status .)

用数码管显示电压，发送到串口，然后有高低电压报警，只有部分代码(Display voltage with digital tube, send it to serial port, then alarm with high and low voltage, only part of the code)

STM32单片机的PID算法实例，通过PID算法控制STM32的PWM输出，反馈量是PWM低通滤波后得到的AD(STM32 microcontroller PID algorithm instance, through the STM32 PID algorithm to control the PWM output, PWM amount of feedback is obtained after low-pass filter AD)