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功能：用杜邦線把繼電器輸入端口和P1^1連接起來，按鍵S1吸合，按鍵S2釋放繼電器

時間：2010—7—20

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#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)    //去抖動后是否按下相應按鍵
                        {
                                RELAY=1;    //繼電器吸合
                        }
                }

                if(!key2)
                {
                        delay(5000);
                        if(!key2)    //去抖動后是否按下相應按鍵


                        {
                                RELAY=0;    //繼電器釋放
                        }
                }

        }
}