Interesting project but we are not a free design or code writing service. We will be happy help out with your design and or code but first you have to continue to make an attempt to design it, write it, post it and explain what is not working properly.
Since there is hardware it is always best to post links to technical information as there are many versions of the same or different items. Important, since we cannot see your project, you are our eyes, you need to post using the language of electronics, an annotated schematic, (best) or a clear picture of a drawing. Pictures never hurt. Frizzing diagrams are not considered schematics here, they are wiring diagrams, great for assembly lousy for troubleshooting.
Useful links - check here for reference posts / tutorials
Since there are other units out there what are they, how do they work. Posting links to them will definitely help us help you as most of us are not into racing pigeons. Tell us how this is to be powered? .
How does the NFC (Near Field Communications) work in this application? There weill be more questions but you will get there.