I am trying to use LF RFID reader with microcontroller. RFID should have ISO 11784/85 standards. I used these RFIDs aliexpresslink1 and aliexpresslink2 . These RFID's read range is not enough for me. I had max 25 cm read range with them. I need at least 40-50 cm read range with 30mm round tag. I decided to design my own RFID but I really couldn't find on digikey, mouser . Almost all products are out of stock.
This one has stock HTRC1101 but I don't know read range. Data sheets don't say about it.
I reviewed designs and they have bigger than 70cm read range with 134.2 KHz. I reviewed all of them using high voltage like 24-42 V. My modules are 3.3V and 9V. I really don't know why I can't find RF reader IC like 24V 36V. Maybe that's why I have low read range.
I know they are expert and I am just a beginner and I am trying to learn. So, can you suggest me RFID reader IC at least 40cm read range ? In youtube, there is a lot of RF design video but I couldn't find LF RFID design.
I really want to design but If I couldn't find right IC, I will probably buy something like this aliexpresslink3 and I will communicate this with my microcontroller over RS232 to TTL converter.
As I said, I looked some designs and they manage to have higher then 70cm read range. Is there another way ?
How can they buy 24-42V RFID IC ISO11785 because I couldn't find digikey, mouser , Farrell.
Everything is out of sale.
If you have LF RFID design guide , can you share ? I read this TILFRFID .
You might not have noticed but there is a global shortage of ICs at the moment and many components are on a 1 year lead time at the moment. That is why a lot of distributors are out of stock.
That is typical of the range you get where the transistor and receiver are in the same package.
You will struggle to get a greater range. One way to get a better range is not to have the electronics in the centre of the coil but off to one side as much as possible.
You keep saying you want to design your own but then say you are looking for a chip in which case that is not designing your own.
To design your own is a difficult job and requires that you have an oscilloscope, a signal generator and a plentiful supply of different value components. I have managed professional electronics engineers that couldn’t design a reader from scratch.
I have done a project that might help you but this is way more than a simple reader, so you will need the skill to extract the relevant information that applies to a simple reader. http://www.thebox.myzen.co.uk/Hardware/RFID_Sequencer.html
For example, I will bought this components and I will make PCB . I can't design the way you think. At least for now . In data sheet, they didn't mention about read range and this IC is not manufactured anymore.
Yes that is not designing but simply putting together an IC with the suggested design in the data sheet. This is known as a reference design.
The problem with ICs like this is that the range is not very good as you have found out. This is because the sensitive receiver is put next to the transmitter which makes a big signal and makes the receiver deaf. So you can not get a large reading range with an all in one IC. I used to design RFID readers for a living and we never used chips like this because of exactly this problem.
I am asking again but sorry. I don't have a scope or spectrum analyzer. Is there a program like LTSPICE or Proteus that I can simulate my circuit ? I found these The UK Microwave Group - Software .
Yes you can simulate your circuit but that will not help because you are using real components with real tolerances and none ideal parameters. You need to know these in order to simulate the components you are using. For example what is the resistance / capacitance and dielectric constant of your coil. What is the inductance and dielectric constant of your capacitor.
You can get a theoretical idea of a starting point but that is where you have to start measuring things, because real components are impossible to simulate exactly, and you have to build things with real components.
A spectrum analyser is useless for this sort of work anyway and it is no good having an oscilloscope unless you know how to use it and how to interpenetrate what it shows you.
I am not that expert. I want to design like this:
. In data sheet, they didn't mention about read range and this IC is not manufactured anymore.