To explain my question, I want to let my vehicle read a traffic signal when it passes by.
I was thinking about using the 2.4GHz radio com, but it has already been assigned to another task. The traffic is also pretty heavy in a smaller range, so the radio com may not handle it well without creating any interference (multiple cars and traffic lights simultaneously).
So I decided to go with RFID.
The typical RFID use is an RFID reader or writer working with a card or beacon to read/write info. That is a relatively "one-way" communication, the information on a card won't change unless you re-write it.
But in my scenario, the traffic light is constantly changed, so I can't use a single card with fixed info to represent the info of the lights. It needs to be dynamic.
So, does an RFID reader could read info direct from an RFID writer without passing any card? (Is it possible?)
A typical RFID reader's effective reading range to a sourceless tag is about 5cm, now I have a sourced tag(which is the RFID writer), so I'm expecting a higher range. Even if the range cannot go higher than 5cm, the Min gap between the reader and writer will still be less than 5cm by design, so that shouldn't be a problem theoretically.
I accidentally touched the delete button on the iPad lol
That is correct, I don't really know those terms, that I don't speak English very often. We usually determine a tag category with "is it powered on," which the "source" means "power source."
My RFID combined read/write device manufacturer says the effective range is 6cm. I'm expecting those two RFID devices perform an 8-10cm range for my scenario.
Which is 100% enough.
This is only a minor issue from my whole project design, but I'll let you know if that works when I got time to perform a test. You might need to wait for a century. XD
