We know about NFC and can do this. Experienced with web an dmobile development we have a professional team and this system can be made much accurate.
More functionality to make this system more useful can be discussed while development.
We can start right away with our high internet, 99% dust free, 100% process oriented, 100% experienced professionals, at our technology center.
Over 8 years experienced development for mobile and web. Please visit us at www.porchys.com.
Add to skype for faster communication, as "pratzc'
Look forward for your response.
Regards
Prateek