OR with SB Components UHF-RFID Scanner in Pico or ESP32
YT:
We are a library UHF RFID supplier. We use a number of reader modules and an even greater number of different antennas. What you are looking for is what we do commercially, but we are also keen to encourage people to have a go themselves.
Reading books at a library entrance/exit is non-trivial and you will need a good choice of UHF tag, that can be acquired from lots of suppliers.
Something like this that you can buy in low volume to practice with.
also a reader module that you can use with arduino IDE (would recommend the ESP32 for more horsepower)
you will need to work out how to wire this into your CPU but you will only need the 5V, GND, TX and RX pins for it to work.
There are smaller and less expensive solutions but they just won't have enough power or enough speed to get the result you are looking for. There are many manufacturers of these modules with Impinj R2000 chipset - we have just found this one is super easy to work with and very reliable.
as for antennas - you need something that can push enough power out to 1.5m so you will not get away with anything small. I recommend a circularly polarized antenna of at least 250mm x 250mm in size with about 8dBi of gain. You probably need two of these.
be aware that every country has different regulations regarding which UHF frequency can be used. Make sure you find out what yours is and then set the range appropriately in the reader module.
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