Counting Nerf Darts Inside the Clip (Hall Effect, Restive strip, Digital Calipars)

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Gordon
Well, I'd have said the HMC5883 should work fine. It'd be worth some experimenting.

The digital caliper is an interesting idea - it might also be possible to create your own 'digital linear encoder'... Basically a PCB with a pattern of conductive areas:
```
 # # # # # # # #
  ##  ##  ##  ##
    ####    ####
        ########
```
You could hack something out of a bit of protoboard, or could even use black markings and those IR reflectance sensors.

Then you just read the 4 'bits' and you have the distance in binary.

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