Card triggered playmat

[CaptStimulation]

If I wanted to make a playing card triggered rgb playmat what tech should I start looking into. Magnets, nfc? Basically the goal is to get lights to turn on or off based on if a card is in a specific spot. 

[SasaKaranovic]

How many cards? Do you need to differentiate them or just detect when card is present/absent?

 

 

If you need to differentiate them, then NFC tag and NFC reader would be a start.

If you don't care about which card is placed, just is it placed or not, then for detection you can use magnets and reed switches, light dependent resistor, proximity detector or a simple emitter and receiver LED.

 

Try explaining your project a bit more and you will probably get more details, maybe even links to similar existing projects.