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Proximity Testing (Keyless Ignition System)

Posted: Sat Jan 12, 2019 12:08 am
by mavii
I'm interested in building a low power proximity sensor. I want it to be able to detect proximity in 3 dimensions similar to the say a Keyless Ignition System works in a car. I am not sure where to start. Does anyone know:

1) What technology is used in cars?
2) What other options I might use?
3) What components I should buy to start experimenting?