Reading speed Grove 125Khz RFID module

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seeed374
Pre-kindergarten
Pre-kindergarten
Posts: 3
Joined: Thu Nov 01, 2018 8:56 pm

Reading speed Grove 125Khz RFID module

Post by seeed374 » Thu Nov 01, 2018 9:39 pm

Hi I am facing stability issues with the Grove 125Khz RFID module.
I have connected this reader to an arduino Mega and am using this reader to detect trains running on a traintrack.
On slow speed the reader picks up all tags (mounted underneath the train) however when I increase speed the stability of the reading fluctuates. Sometimes it reeds every lap, but it can also fail for multiple laps.

Is there a way to increase accuracy when the tag is passing with more speed? (maybe a bit vague, but it is difficult to say what the speed of the train (or tag) is when passing the reader.

bill.yu
Elementary-5
Elementary-5
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Joined: Mon Apr 02, 2018 11:05 am

Re: Reading speed Grove 125Khz RFID module

Post by bill.yu » Fri Nov 02, 2018 5:07 pm

HI there,

Please try to increase the antenna size. you can make some by yourself. thanks.

Image

seeed374
Pre-kindergarten
Pre-kindergarten
Posts: 3
Joined: Thu Nov 01, 2018 8:56 pm

Re: Reading speed Grove 125Khz RFID module

Post by seeed374 » Sat Nov 10, 2018 5:57 pm

Hi, thanks for your reply.
Based on your advise I tried the following.

I created my own antenna using special wire. I used the instructions and references in the following youtube movie (https://www.youtube.com/watch?v=MrDXfCmt4-U)
I also bought a different antenna RFID HQ READER ANTENNA, 125KHz/134,2KHz, Typ MSR45, AIR COIL, LUFTSPULE (https://www.ebay.de/itm/201359391347)

However, both antenna's are not working with the RFID reader. When soldered on the give no reading at all. When I revert back to the original external antenna the reader works again.

I would still appreciate some advice.

seeed374
Pre-kindergarten
Pre-kindergarten
Posts: 3
Joined: Thu Nov 01, 2018 8:56 pm

Re: Reading speed Grove 125Khz RFID module

Post by seeed374 » Sun Nov 11, 2018 6:11 pm

Additionally, can somebody point out the inductance of the PCB for the Grove module?
I am using this calculation tool
http://www.circuits.dk/calculator_multi ... ircore.htm
to calculate the amount of turns (or length of the wire) from the antenna. I could not find any datasheet of the grove module that shows me what inductance to use.

For example, the youtube movie that I shared above uses a ID-3LA module where you can find a datasheet http://www.id-innovations.com/httpdocs/ ... D-20LA.pdf that tells that inductance has to be 1.337mH.

bill.yu
Elementary-5
Elementary-5
Posts: 566
Joined: Mon Apr 02, 2018 11:05 am

Re: Reading speed Grove 125Khz RFID module

Post by bill.yu » Wed Nov 14, 2018 5:04 pm

Hi there,

it is 475uH. you can refer to 51X82mm. sorry, we do not sale this part yet. thanks.

Image

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