CODING:

[ashish gaikwad]

CODING:
// Program to make a bidirectional visitor counter using IR sensor #include #define msec 1unsigned int num=0;sbit dig_ctrl_4=P1^3; //declare the control pins of seven segmentssbit dig_ctrl_3=P1^2;sbit dig_ctrl_2=P1^1;sbit dig_ctrl_1=P1^0;unsigned intdigi_val[10]={0x40,0xF9,0x24,0x30,0x19,0x12,0x02,0xF8,0x00,0x10};unsigned int dig_1,dig_2,dig_3,dig_4,test=0;unsigned char dig_disp=0;sbit up=P3^5; //up pin to make counter count upsbit down=P3^6; //down pin to make counter countdown

void init() // to initialize the output pins and Timer0{up=down=1;dig_ctrl_4 = 0;dig_ctrl_3 = 0;dig_ctrl_2 = 0;dig_ctrl_1 = 0;TMOD=0x01;TL0=0xf6;TH0=0xFf;IE=0x82;TR0=1;}void delay() //To provide a small time delay{TMOD=0x01;TL0=0x36;TH0=0xF6;

TR0=1;while(TF0==0);TR0=0;TF0=0;}void display() interrupt 1 // Function to display thedigits on seven segment. For more details refer sevensegment multiplexing.{TL0=0x36;TH0=0xf6;P2=0xFF;dig_ctrl_1 = dig_ctrl_3 = dig_ctrl_2 = dig_ctrl_4 = 0;dig_disp++;dig_disp=dig_disp%4;switch(dig_disp){case 0:

P2= digi_val[dig_1];dig_ctrl_1 = 1;break;case 1:P2= digi_val[dig_2];dig_ctrl_2 = 1;break;case 2:P2= digi_val[dig_3];dig_ctrl_3 = 1;break;case 3:P2= digi_val[dig_4];dig_ctrl_4 = 1;break;}