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Change VL53L0X detect mode to HIGH_SPEED #5

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brianwiddas
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Was using LONG_RANGE, which measures 2m but at 33ms
HIGH_SPEED measures 1.2m, with slightly reduced accuracy, but at 20ms

This isn't related to the bus speed problems. This is just making the laser read as fast as it can; so we can get as many readings as possible during the speed run; this change gives us approximately 50 readings per second per device instead of 30.

The trade-off is a couple of percentage points of accuracy, but that should be acceptable. We can always play around with it if not.

Was using LONG_RANGE, which measures 2m but at 33ms
HIGH_SPEED measures 1.2m, with slightly reduced accuracy, but at 20ms
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