Automatic Light Sensor With Counter

[Rushdiey]

How to make c programming coding.. when ldr goes dark it will count something.
I hope someone can share it

#include <reg51.h>
#include <stdio.h>
sbit LDR=P0^7;
long int count;
long int i;

void main()
{
while(1)
{
if(LDR==1)
count++;

else
{
count--;
}
}
}

this is my example. but not work

 

[Golden Electronics]

Why u put else condition ?
How u confirm ur code not working ?
Is ur H/w 100% ok ?
Explain ur application ?

 

[Rushdiey]

I want to put it at door.. when someone coming i will count people.
for else i just randomly put

 

[Golden Electronics]

I want to put it at door.. when someone coming i will count people.
for else i just randomly put

ip_pin => ur pin
count =>variable
limit =>max count limit
while
{
if(ip_pin==0)
{
count++;
}
delay(100);
if(count>limit)
{
count=0;
}
}

 

[tpetar]

Do you have separate doors one for entry and one for exit ?


Best regards,
Peter

 

[Golden Electronics]

If two door then use count++ IN, count--OUT. u can use while also instead of if for pin sensing