znpa

PWM调光 1、学习目的：利用定时器产生PWM，了解原理和使用方法 2、硬件要求：LED灯 定时器 3、试验现象：LED灯由亮到灭，由灭到亮逐步变化，也就是调光现象(PWM dimming, learning objectives: the use of the timer to generate PWM understand the principles and use hardware requirements: LED lamp timer test phenomenon: LED lights from bright to off, gradually changes from off to bright, that is, adjusted optical phenomena)

STM32F2XX系列单片机开发板的库函数 (Library Functions STM32F2XX Series MCU development board)

说明：  基于stm32L151核心板的LoRa无线传输(LoRa wireless transmission based on stm32L151 core board)

simulink of dynamic voltage restorer 2

电场，考虑电导率，电流密度矢量关系式变化关系(Electric field, considering the electric conductivity, the current density variation of the relation vector)

四个舵机的键盘输入控制，需要使用arduino的串口通讯和串口监视(Keyboard input control of the four steering engines requires the use of arduino serial port communication and serial port monitoring)

说明：  定时器2相关例程，包含定时器的运用，0-99计时，18b20的运用。(Timer 2 related routines, including the use of timers, 0-99 timing, 18B20 application.)

4*4键盘课件，包含电路图，教学方法、教学目标(4* 4 keyboard courseware, including circuit)

STM32F407工程模板，基于官方固件库，无操作系统版(STM32F407 engineering template, based on official firmware library, no operating system version)

可实验0.5KHZ到10KHZ的简单测频,并由数码管显示出来!(Experimental 0.5KHZ can be simple to 10KHz frequency measurement by digital tube display!)