Dear friends,
sorry in the bad first massege.
I still needed to build a man door with arm.I searched rfid shields butthat work from 10cm distance which is too small. then I looked after other rfid reader/tag solutions not for people, and I could not find anything. I know that rfid technology is close range technology but I cannot attach a heavy and large object that includes batteries onto man's collar. there are these kind ofsolutions for dogs but they are mush more powerfull than men.
any suggestions about which kind of technology should I use ? I guess minimum 25-30 cm would be required to sense the "specific man with collar". thanks.