Using LEDs

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i using hall effect make led turn off.  when magnet approaches hall effect, led turns off.  there way sense when led turn off (stop lighting up) other seeing led off?  guess want program check current state of led.

well...   you using arduino in-between hall-effect sensor , led, right?  in case, program (sketch) "knows" if led on or off, since, it's thing turning on/off . ;)

if that's not set-up, can connect either hall-effect output, or led-circuit 1 of arduino input-pins, , sketch can read input.  (you need "match" voltages, might need see schamatic.)


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