485proteus

sim900a gprs上传数据，51单片机c语言源程序(sim900a gprs upload data, 51 c language source)

说明：  基于STM32F103单片机的PWM测试源码(PWM test source code based on STM32F103 MCU)

基于单片机农作物智能灌溉控制技术 简单易懂程序(Microcontroller-based smart irrigation control technology crops straightforward program)

说明：  针对stm32f103芯片的arm板上用于编码器转速和读取脉冲，另文件内附有硬件接线说明(The arm board of STM32F103 chip is used for encoder speed and reading pulse. Hardware wiring instructions are attached to the file.)

多点温度循环测量可以实现多个点温度循环检测并显示(Multi-point temperature measurement cycle can implement multiple point temperature loop detection and display)

说明：  内含C文件及Proteus仿真文件 矩阵键盘输入密码，初始密码为12345678,每按一次键有短滴声,输入密码正确液晶屏显示正确信息并且电机转动，输入密码错误会发出警报，LED灯闪烁，复位取消警报，0--9号键为数字键,10号键为确认键，11号键清除键清除所输入密码或取消修改密码，12、13、14号键实现修改密码功能。(Containing C file and Proteus simulation file Matrix keyboard input password, the initial password is 12345678, every time a key is pressed, there is a short sound, the correct input password LCD screen displays the correct information and the motor rotates, the input password error will send an alarm, LED flashes, reset and cancel the alarm, 0-9 keys for the digital key, 10 keys for the confirmation key, 11 keys to clear the input secret. Code or cancel password modification, key 12, 13, 14 to achieve password modification function.)

单片机计算机设计，实现加减乘除，包括小数点的运算，用的是4*4的键盘(Single chip computer design, realization add, subtract, multiply and divide, including the operations of the decimal point, with 4* 4 is the keyboard)

51单片机的示波器，所有资料,dajiakuaixia(an Oscilloscope by mini51)

MCu based distance measurement from 20-80cm based on SHARP ir sensor

将小文件写入外部SPI FLASH中，现将文件写入到单片机的某块flash区域，然后在写入外部falsh，适合小文件(Write the small file to the external SPI FLASH, now write the file to a single chip flash area of the single chip, and then write the external falsh to suit the small file.)