8255keyboardexperiment

与secs相关的hsms协议，用于半导体设备通信的(Secs associated with hsms agreement for semiconductor equipment communications)

说明：  STM32对讲机VS1053和2401。使用STM32做的对讲机，用VS1053做语音的编码和解码，用NRF24L01做通信。带有详细代码。(STM32 walkie-talkie VS1053 and 2401. Use STM32 as walkie-talkie, VS1053 as voice coding and decoding, NRF24L01 as communication. With detailed code.)

240128液晶驱动的测试程序，c语言编写(240,128 LCD driver testing procedures, c language)

用PWM技术对直流电机进行调速，并用LED进行指示(DC motor speed control using PWM technology, with LED indication)

利用c51编制的温控控制空调和窗户的实用程序(Compiled using the c51 thermostat controlled air conditioning and windows utilities)

信号发生器，液晶1602显示，通过键盘控制AD9833输出需要的波形和频率，可程控(Signal generator, LCD 1602 display, through the keyboard to control the the AD9833 output waveform and frequency, programmable)

写满24C02A内部整个4K bit串行E2PROM，然后检验写入数据是否正确并显示结果。正确：点亮8个红色发光管(F5区)；错误：熄灭8个红色发光管(Write full 24C02A internal 4K bit serial E2PROM, and then check whether the data is correct and di)

说明：  双音频DTMF拨号程序MT8888/MT8880最全期刊资料，有详细电路图+源程序，共计30多篇。(DTMF DTMF dial-up procedures for information MT8888/MT8880 most journals, a detailed circuit diagram+ source code, for a total of more than 30.)

说明：  一本讲述proteus与51单片机仿真的书(A book about the simulation of Proteus and 51 single chip computer)

基于stm32单片机的pid算法电机控制，可实现pid算法控制电机转速。(PID algorithm motor control based on STM32 microcontroller can realize PID algorithm to control motor speed.)