Hi All
i need open a garage using passive Passive rfid because i need the reader detect my tag rfid from at lest 2.5 meter, i used active rfid but it is only read from 2cm.
please if any one can help me how can i find passive rfid tag and reader an how can i use it with arduino.
regards
Google "long range rfid" for the possibilities.
enggemo:
i used active rfid but it is only read from 2cm.
I think you have your "active" and "passive" terms mixed up.
A passive RFID doesn't have a power source of its own. Active RFID uses a battery or some other power source.
The cards and tags commonly associated with RFID are passive devices. You can get passive tags which work over 2.5 meters but I doubt they'll be inexpensive.
If you use an active tag then you can be much farther away from the reader than you can with a passive tag.
Depending on how you define "RFID" a normal garage door opener could be considered RFID since its sending IDentifying information with Radio Frequencies.
If you're willing to power the transmitter, then you have lots of options. OpenBeacon is an open source active RFID project.
Of course the battery on your active RFID transmitter will last much longer if you activate it with a button press rather than having it continually listening for the base station's signal. This takes us back to a normal garage door opening device.
If you power the active RFID device from the car's electrical system, then it could easily provide the small amount of current needed to monitor for the garage's signal. Even if your device is battery powered, you shouldn't need to change/charge the battery very often since lots of radio devices don't require much power to receive signals.