ATK-SIM900A

ISO/IEC 7816-1-1998 ISO/IEC 7816-2-1998 ISO/IEC 7816-3-2006 ISO/IEC 7816-4-2005 ISO/IEC 7816-5-2004 ISO/IEC 7816-6-2004 ISO/IEC 7816-7-1999 ISO/IEC 7816-8-2004 ISO/IEC 7816-9-2004 ISO/IEC 7816-10-1999 ISO/IEC 7816-11-2004 ISO/IEC 7816-12-2005 ISO/IEC 7816-13-2007 ISO/IEC 7816-15-2004 (ISO/IEC 7816-1-1998 ISO/IEC 7816-2-1998 ISO/IEC 7816-3-2006 ISO/IEC 7816-4-2005 ISO/IEC 7816-5-2004 ISO/IEC 7816-6-2004 ISO/IEC 7816-7-1999 ISO/IEC 7816-8-2004 ISO/IEC 7816-9-2004 ISO/IEC 7816-10-1999 ISO/IEC 7816-11-2004 ISO/IEC 7816-12-2005 ISO/IEC 7816-13-2007 ISO/IEC 7816-15-2004)

用单片机产生频率，占空比可调的方波，这是C语言的原代码。(Produced with single-chip frequency, variable duty cycle square wave, which is the C language source code.)

电力系统电度表通讯协议，主要针对DL645协议标准(Power system meter communication protocol, mainly for DL645 protocol standards)

基于C语言的电导增量法，可以改变步长，使系统快速精确找到最大功率，很好！(The incremental conductance method, based on the C language can change step length, the system quickly and accurately find the maximum power, very good!)

使用红外遥控调整时间并用12864液晶显示的王年丽时钟程序(Infrared remote control 12864 to show big clock)

通过PWM定时器延迟一秒，实现一个LED灯的明灭。实验中观察I/O口的值对LED灯的明灭的控制，学习I/O口的输入输出方式和设置，了解PWM的配置方式(Through the PWM timer to delay a second, the realization of a LED lamp at. I/O values for LED lamp light control experiment, learning I/O port input and output method and setting, understanding of PWM configuration methods)

小车沿着黑带前进，这事往年一个竞赛题目的程序，对大家有帮助。(The car along the black belt, it past a contest questions purpose program, are helpful to you. )

利用ULN2003A进行驱动，产生PWM波，里边有照片，可供参考，通过本例程了解PWM 的基本原理和使用 (#include <reg52.h> unsigned char timer1 sbit PWM=P1^2 void system_Ini() { TMOD|= 0x11 //PWM TH1 = 0xfe //11.0592 TL1 = 0x33 TR1 = 1 IE =0x8A } main() { system_Ini() while(1) { if(timer1>100) timer1=0 if(timer1<30) PWM=0 else PWM=1 } )

IR decoding digital display

利用定时器产生PWM，使LED灯由亮到灭，由灭到亮逐步变化( Use timer produce PWM, make the light to destroy LED lamp, the gradual change to light out )