Society of Robots - Robot Forum

Electronics => Electronics => Topic started by: ledrac on March 30, 2008, 05:25:26 AM

Title: RFID tags
Post by: ledrac on March 30, 2008, 05:25:26 AM

I was wondering if I could build a simple robot that would follow an RFID tag? What kind of sensors would need to be on the robot to determine the correct location of the tag? Any ideas would be great.

Title: Re: RFID tags
Post by: hazzer123 on March 30, 2008, 01:01:07 PM

AFAIK, RFID tags give out only information that they exist. You don't get any directional or distance information.

If you wanted to use RFID tags for locating something. You would need to have 2 RFID sensors quite far apart and use the strength of the signals to triangulate and find out where the tag is.

Any objects in between the tag and the sensor would degrade the signal and give false reading.

Also, small RFID sensors have short range (only a few cm).

I think its pretty unfeasible. But i have only done a bit of research.

Feel free to correct me :D

Oh and heres a link which you might find interesting - http://www.discovercircuits.com/H-Corner/smart-key.htm (http://www.discovercircuits.com/H-Corner/smart-key.htm)

Title: Re: RFID tags
Post by: ledrac on March 31, 2008, 06:09:59 AM

Thanks, I wasn't really sure how RFID tags worked. What about an RF signal? What kind of sensors are required to triangulate RF? I want my robot to only follow me.

Title: Re: RFID tags
Post by: Admin on April 06, 2008, 12:42:20 PM

http://www.societyofrobots.com/robot_faq.shtml#robot_track_person