Reading RFID device

[Spacerat]

‘Passive’ was the keyword, you can’t read something that isn’t powered.

That’s just a barcode reader though?
Other factors come into play, such as capacity for data vs error correction, lighting etc. Denso has a nice app for testing purposes.
Also device configuration, if it can run on a virtual COM port instead of as a keyboard wedge, that way it can be a background service without affecting an end-user.

They need to upgrade to BLE lol.
In this context it has nothing to do with the card, it’s merely communication.
I could pass the data from a QR code to the controller using a board like below.

Active vs passive has nothing to do with frequency. my point was that with passive tags UHF has better read range than HF and in turn better than LF. Read ranges increase with the energy you put into the antenna and how sensitive and tuned your antenna is to the frequency in question.

 

[DA-LION-619]

Active vs passive has nothing to do with frequency. my point was that with passive tags UHF has better read range than HF and in turn better than LF. Read ranges increase with the energy you put into the antenna and how sensitive and tuned your antenna is to the frequency in question.

Yes and? No other claimed otherwise.
It was a passive tag on a cat.

 

[PaulGherkin]

Active vs passive has nothing to do with frequency. my point was that with passive tags UHF has better read range than HF and in turn better than LF. Read ranges increase with the energy you put into the antenna and how sensitive and tuned your antenna is to the frequency in question.

You know very little about RF it seems..

There's things like coupling coefficients. Kp is very important.

Both end are tuned circuits... the Q factor is important to ensure that the maximum energy is transferred from the reader to the tag. THAT is what affects read range... not the frequency.
The higher the frequency, the smaller the antenna, and consequently the bigger challenge of getting good range and countering the effects of de-tuning which in turn reduce the available data transfer bandwidth.


This is why the tags used for e-tolls and the like are active i.e. contain a battery, to avoid the issues. The tag can transmit back on its own and is not reliant on power from a transmitting antenna