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Arduino ultrasonic range detector

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Hello!

So for some time i've been on and off with this small project i have. I started out with programming it with assembly and PIC, got done and put it aside.
Now i got myself a couple ardunio's uno and nano.

I can get the range detector to detect distances and turn on different leds for each distance and so on.

what i want to do now is to make it blink faster the closer an object is, and slower the further away an object is.
I can't seem to make that work.

Got any tips?

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