Thank you for your reply.
i recognize for a beginner it’s very difficult.
So i will try to explain this project:
it can be used as door sensor monitoring.
So when the door is open 8051 must start a timer and count in seconds or ms etc…
and when the door is closed 8051 must stop the timer and in the LCD the time can be displayed.
that’s all for this moment.
i’m trying to study this….
Thank you