_____________________________________________________________________ 功能:用杜邦线把继电器输入端口和P1^1连接起来,按键S1吸合,按键S2释放继电器 时间:2010—7—20 _____________________________________________________________________ #include<reg52.h> sbit key1=P3^0; sbit key2=P3^1; sbit RELAY = P1^1; void delay(unsigned int cnt) { while(--cnt); } main() { while(1) { if(!key1) { delay(5000); if(!key1) //去抖动后是否按下相应按键 { RELAY=1; //继电器吸合 } } if(!key2) { delay(5000); if(!key2) //去抖动后是否按下相应按键 { RELAY=0; //继电器释放 } } } }