On 15/01/2011 21:01, YES NOPE9 wrote: > On Jan 14, 2011, at 1:22 PM, YES NOPE9 wrote: > > I have been following NFC for some time. The 10-30 cm range is exactly w= hat I want for "remote control". I want it to be low power, easy to determ= ine what devices are linked and hard to eavesdrop. Intel light peak techno= logy does not meet many of my requirements. > Light peak is nothing to do with NFC. NFC is not usually needing a high=20 speed inter PC bus. More than 15cm is pushing it. Inverse Square Law. 30cm will need x4=20 power of 15cm or x16 power of 7cm > #1 It seemed to me that NFC chip makers were focusing and limiting their= products to customers who could order millions of parts. Is this true ? Four main markets: Products / palettes with NFC tags Door access Tickets Payment cards (credit or debit types). I think NFC on payment cards is=20 stupidity from a security principle. The track record of how Chip & PIN=20 has been done is not inspiring (you can fake a card and if it's asked by=20 reader if PIN is ok, it answers yes. Most C&P don't validate PIN with=20 Bank, only card!) > #2 NFC appears to be gaining momentum. NFC is reported ready to appear = in many cell/smart phones coming onto the market. The iPhone appears to on= e of these. Nokia been pushing it for years. iPhone is only latest. What will be the=20 application? Low cost payments/Ticket replacement? Security? Who will be=20 selling products/Services? > #3 I want to use NFC for remote control purposes and data acquisition. = I intend to design an NFC reader and some different slave units. I would l= ike to be compatible with what is coming out in the smart phone area. I wo= uld prefer to use the simplest protocol possible. Any suggestions on proto= col and configuration ? It's very poor choice for Remote Control. Not intended for the 1m to 4m=20 distance Remote Control uses. It's intended to recall stored data faster=20 than a 2D optical code, without contact. Swipe and Checkout=20 applications. Plenty of simple Remote Control Protocols with very cheap=20 RF chip chip in 315MHz, 433, 874, 915 and 2450MMz ISM bands licence free=20 depending on country, and same protocol/ CPU level TX/RX pins will work=20 directly with Ultrasound or IR solutions (IR 3 pin package receiver has=20 optical filter, photo transistor and 38KHz carrier filter with TTL out). NFC is intended to interrogate and retrieve secured information with=20 possibility of storing / update of a transaction record. > #4 It has been suggested that I could roll my own RF circuitry. I wonder= if it would be better to find a chip for this ( NXP maybe ? ) or roll my o= wn ? Everyone nearly has very cheap chips for 315MHz, 433, 874, 915 and=20 2450MMz ISM band Remote Control (Etom, Analog Devices, NXP, Maxim) that=20 do RF TX or RX and interface direct to CPU. Range up to 10m trivial and=20 200m easy. IR is up to 5m LOS and often 2m not quite LOS. NFC tends to=20 use lower frequencies so that the very near "Reader" will power the tag=20 / payment card / door key. The NFC in phones is likely to be a Client for a Reader for payments,=20 rather than a Reader, i.e. simulate a payment card or ticket. Such fun.=20 A nice tool to "emulate" tags, cards and keys dynamically. Will make it=20 easier for script kiddies to break the NFC "security". Since the original concept of NFC was a smart replacement for Barcode=20 replacement (photo copied bar codes work) the "Security" features are=20 afterthoughts for the Ticket, door and payment card markets. Oyster card=20 and passport cloning is example of how "well" the Security works. If someone has an NFC tag you can even track that tag without decoding=20 the information. Serious privacy issue if "someone" has remote access to=20 loads of NFC readers. > All my development will be FLOSS ( open source ). Very nice. Licences for NFC might not allow that. They rely a lot on "security by=20 obscurity" > Gus in Denver 99gus 99nfc What is the application? --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .