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digital visitor counter project report
Post: #1

please send me a project report on automatic digital visitors counter using 4026
Post: #2
A counter that can change its state in any direction, under the control of an ascending selector input, is known as anup-down counter. The circuit given here can count numbers from 0 to 9999 in up and down modes depending on the state of the selector. It can be used to count the number of people entering a room in the upstairs mode at the front door. In the descent mode, you can count the number of people leaving the room decreasing the count at the exit door. It can also be used on the doors of parking areas and other public places. This circuit divided into three parts: sensor, controller and counter display. The sensor would observe an interruption and provide an input to the controller that would operate the counter in up / down mode depending on the setting of the selector. The same count is displayed on a set of 7-segment displays through the controller.
From the block diagram it is clear that the pairs of sensors are placed face to face so that the IR radiation of the IR LED is continuously received by a phototransistor which causes its emitter base junction to be forward and the collector current Ic is Equal to the emitter current Ie (ie Ic = Assuming the base current is negligible. Therefore, the node of the voltage collector is zero (logic 0) which is the port pin of the P3.2 power tomcontroller And P3.3, if any object is placed between the pairs of pairs of sensors IR radiation which in turn puts the phototransistor in cut mode and Ic! = Ie, this causes the collector voltage to + 5V (logic 1 )

// Program to make a bidirectional visitor counter using IR sensor #include <reg51.h>#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:

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