Arduino laptimer using inductive loop

Projects General Guidance
1

I'm currently building a laptimer (and drag tree) for use with real cars.
Almost everything is working, except passing car detection: - YouTube

At first I was using an ultrasonic ranger to detect the car passing, but this method is too slow.
After some searching I found that using an inductive loop is the easiest way to detect cars in my case, especially since I will be using my laptimer on a dirt track (so burrying the loop is no problem).

But I can't seem to find any info on how to build an inductive loop and use it with an arduino.
Does anyone have any experience with this?

2

Its the same technology as metal detectors - sure google can find something about those!

3

Hi R

I am wanting to do something similar for Triathlon. I have been experimenting with UHF RFID. You could put a Tag on each car.

Kind Regards

Jason

4

The NHRA uses light beams, personally I would do the same.