2 Replies - 1446 Views - Last Post: 17 September 2012 - 09:16 AM
RFID transfer rate
Posted 17 September 2012 - 08:54 AM
I wonder if anyone of you have the estimated Data transfer rate between an rfid tag and a rfid reader?
Is the dataflow stable or is it only suited for a quick 30bit transfer?
The reason to why im asking is because im researching if an rfid-ish module could be used to transfer data in a reliable and fast manner.
Replies To: RFID transfer rate
Re: RFID transfer rate
Posted 17 September 2012 - 09:07 AM
Then there's the whole 'near field' comm.
Then there's high rate theoretical ones..
End game the parameters of the project would sort of dictate where and what you are using for hardware.
Re: RFID transfer rate
Posted 17 September 2012 - 09:16 AM
But it sounds like you aren't familiar with RFID so let's clear up one thing to start with: There is more than one type of RFID.
In common use:
There are High Frequency and Very High Frequency RFID chips.
There are passive and active tags.
So you are dealing with different radio bandwidths at play here and different signal strengths.
But the most important thing about RFID is that it isn't meant to be a long distance system. And it was never designed for mass data transfer.
The farthest distance I've seen in use is the highway Toll Pass stickers you get for eToll systems. You drive through the correct lane under the really big and really powerful antenna and your eToll pass responds with its number. You then get billed for that toll booth without stopping. So at most, maybe 100 feet distance using a very narrow cone of transmission. The farther the distance, the larger the antenna on the RFID tag must be - unless you shift to a powered tag (active).
Most warehousing uses RFID. WalMart makes it a requirement of all its vendors. You point an RFID gun at a pallet of merchandize and all the tags respond, so you get a count of what is actually in the cartons without opening the cartons.
But in a way it is a lot like a smart sonar. You send out a ping, you get a single packet of data back.
If you want real data transfer you probably should stick with established systems like WiFi. WiFi chips are small and don't need much power. That's why you see them in small USB dongles.
Even bluetooth would be a better direction to go as it was designed to carry ongoing bi-directional streams of data: Like continuous streams of music from your iPhone to your bluetooth headset.
This post has been edited by tlhIn`toq: 17 September 2012 - 09:18 AM