I'd like to thank everybody for their help. As this is our first time doing a design course as broad as this we started throwing ideas out on the internet before doing much real research. With 2 weeks of research - we have gone through several books including RFID primers, and the IBM sourcebook on RFID.
Thanks a tonne for the suggestion lwo - for the ISO 15693 RFID cards. The range is perfect and the readers are affordable for our design implementation.
We are more geared to using passive RFID as we'll need several and powering them on a broader scope would go against our design outcomes.
- Also the RFID is a small portion of the project and we are thus only interested in receiving a digital input from the RFID - in conjunction with a manual input by the user.
Thanks for all the help.
Right now our only issue is dealing with
1) programming an 8 bit binary number into the RFID ISO 15693 - i'll consult the faculty if they have the hardware to do this.
2) interpreting the signal from the RFID Module and sending it to our comparator circuit.
Does anyone have any technical RF module design book suggestions? We're down to 12 weeks to get the design done.
Thanks again for all the help.