Rfid distance measuring

Hardware
1

Hello everyone. After reading up countless of posts on the internet, this forum included, i havent found an answer to my question.

My question is: can rfid shield (RDM6300 125Khz) detect 1mm to 10mm of movement, let arduino mega/nano know about that movement, so the arduino would do 'Thing A'.

I want to make a car key fob from an e60. The key is put in a slot. Slot has an antenna that detects immobilizer chip and allows you to start the car, however, if you push on the key once, it dprings back up, but it also turns ACC on. The key slot has no physical buttons, contacts, etc. So i thought that it senses change in the magnetic fields created by rfid and key holder antenna. I experimented with implementing physical button inside the holder, and im not that happy with how it came out, and frankly, is too crude and boring for me.

If i need to specify anything else to have my question answered, ask.

2

What does the data sheet for the device say?

3

I wouldn't think so... it's an RFID reader... the RFID is either in range or it isn't.

It's possible the car fob setup is also using a Hall Effect sensor to determine the presence/position of the key.

For example US20070120642A1 - Vehicle with passive key fob having presence detection arrangement with key fob - Google Patents

4

It doesnt say anything regarding detection of distance change

5

After looking at the circuit, it does have 2 of them. I guess il have to hook it up to arduino and see how it reacts. Thank you for the tip

1 Like
6

Then I would not expect to find any magic in the device.

7

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