Hi,
I would like to build a walking speed sensor that would work like a laser tripwire. Instead, since lasers would no be able to determine which person is crossing the trip wire, I was thinking I could use RFID with tags on people I need to measure.
But it would require RFID sensors to be precise like lasers so that their distance measured is known, instead of having the RFID sensor reading the tag when it is approximately close by. Is there a way to narrow the projected range of a RFID sensor? thanks!!
Alright, in that case, I thought of a possible solution. Maybe I could go with the RFID to spot when the person is at proximity, then use a laser as a laser trip which activates only when a tag is nearby. Then, the precise moment when the person passes in front of the sensor is recorded, greatly reducing the chances that someone else passes in front of it at the same time. Then the same process would be repeated for the sensor at the arrival
As long as persons pass through one at a time without overlap you can go with light barrier+RFID. When they overlap, you have a problem. That's why video + human readable tags are used for stuff like that.