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I have a problem with interfacing two serial port with 8051 microcontroller. I have to use bar code reader and RF reciver and transmitter which both of them interfaced serially. I am thinking to add an ic to controller these to serial ports, but I don't know which type of IC I should used!! could any one help me, please?
Thanks,
For a school project, you can normally get away with a paragraph in the report mentioning known limitations - and why the limitations are there.
In real life, you really do have to have two-way communication for the RF link. RF never has 100% delivery guaratee. Might not matter when you press a button to turn on a lamp - you see if the lamp turns on, and can press again.
In a shopping chart solution, you do not want customers to not have to pay... Besides - without a two-way solution, how do the chart know when to send? Would it send each item immediately after being scanned? Normal would be to report to the cachier when you are done shopping, in which case the system must know where you are - if you are near the other end of the RF link. A work-around for that is to have the customer scan a magic "shopping-done" bar code to activate the RF transfer.