jack_hty
Newbie level 2
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! URGENT !!!!!!!!!!!!!!!!!!!!!!!!!!!!!
here is my situiation:
i am designing a system which is like this: when there is an object ,which carrying an IR transmitter(like the one in the TV remote controller), come nearby a IR sensor, the transmitter will sends signals(mainly about numbers, like the bus no.) to the sensor...
once the sensor recieves the IR signal, it transfers it the computer through the parallel/serial port...
There will have a VB program which can read the signal from the ports and then performs analysis and decisions. After that, the computer will send back some order or respones an external circuit through the ports again.
And my questions are:
1, how can i recieve the IR signals and then convert them to the form which is suitable of parallel/serial ports input to the computer?
2, which port is the most suitable of my circuit system?parallel? serial?? or anyother else?
3, a fundamental question: How IR transmitt signal? By different frequences of the IR wave? By changing its voltage( like binary system)? or some other else?? In fact, i would like to ask if the IR signals are analog or digital???
4, What is the max. range of IR transmittion??
Thanks a lot!!!!!!
(P.S.: My e-mail: jack_hty@yahoo.com.hk)
here is my situiation:
i am designing a system which is like this: when there is an object ,which carrying an IR transmitter(like the one in the TV remote controller), come nearby a IR sensor, the transmitter will sends signals(mainly about numbers, like the bus no.) to the sensor...
once the sensor recieves the IR signal, it transfers it the computer through the parallel/serial port...
There will have a VB program which can read the signal from the ports and then performs analysis and decisions. After that, the computer will send back some order or respones an external circuit through the ports again.
And my questions are:
1, how can i recieve the IR signals and then convert them to the form which is suitable of parallel/serial ports input to the computer?
2, which port is the most suitable of my circuit system?parallel? serial?? or anyother else?
3, a fundamental question: How IR transmitt signal? By different frequences of the IR wave? By changing its voltage( like binary system)? or some other else?? In fact, i would like to ask if the IR signals are analog or digital???
4, What is the max. range of IR transmittion??
Thanks a lot!!!!!!
(P.S.: My e-mail: jack_hty@yahoo.com.hk)
