Object counting on conveyor system

[praveen]

Guys i m trying to count the no of objects passing in a conveyor belt. for that purpose i am using IR sensor. When sensor goes low it have increase the count by 1.
Now the problem is in the debugger mode it increments the count properly. but while displaying in LCD it increment the count twice… 
And i want to know whether i had followed correct procedure.. since i am new to this programming field. i had include my code below.

 

 

P3 = 0x00;

LED1 = 1;

/* LCD initialization */

InitializeLCD();



/* Display project titles */

DisplayProjectTitle();



*ArrayBasePtr=&UserMessageStorage;



EA   = 1;

EX0  = 1;

IT0  = 1;



while(True)

{



/* Serial bit transmissions */

SerTx(TotalCount[0]);

SerTx(TotalCount[1]);

SerTx(TotalCount[2]);



ArrayBasePtr="  TOTAL OBJECTS  ";

DisplayLCD(1,0,ArrayBasePtr);

ArrayBasePtr=&TotalCount[0];

DisplayLCD(2,5,ArrayBasePtr);

TimeDelay(850);

LCD_CLEAR();

void Extint0 (void) interrupt 0

{

//  IE0=0;

value++;

Count = value;



UserMessageStorage[4]= Count/100;

Count=(Count-(UserMessageStorage[4]*100));

UserMessageStorage[4]+=0x30;



UserMessageStorage[5]= Count/10;

Count=(Count-(UserMessageStorage[5]*10));

UserMessageStorage[5]+=0x30;



UserMessageStorage[6]= Count%10;

UserMessageStorage[6]+=0x30;



TotalCount[0] =  UserMessageStorage[4];

TotalCount[1] =  UserMessageStorage[5];

TotalCount[2] =  UserMessageStorage[6];



ArrayBasePtr="  TOTAL OBJECTS  ";

DisplayLCD(1,0,ArrayBasePtr);

ArrayBasePtr=&TotalCount[0];

DisplayLCD(2,5,ArrayBasePtr);



TimeDelay(850);

LCD_CLEAR();

}

 

thanks for you help

[GANEEV SINGH]

Hi Praveen

I do not see any problem in the code, according to the knowledge that I have. It could be related to any hardware problem as well, like there is a possibility that IR sensor might be interrupting the controller twice whenever it detects any object under itself. Try out more methods of debugging this problem and do share with me the solution/mistake, once you find it. 

Good Luck

[Ashutosh Bhatt]

its not the problem with your HW or SW

it is due to low speed of object passing through conveyor. 

by the time only one object passes through belt, the sensor is interrupted twice – so it counts two objects

so either 

1) you incresease the speed of conveyor

or

2) you apply delay in SW between every object pass

[Author]

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