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dektronics / printalyzer-timer

F-Stop enlarging timer and print exposure meter
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Reduce the sensor-to-surface distance in the meter probe #15

Closed dkonigsberg closed 1 year ago

dkonigsberg commented 3 years ago

The relationship between the meter probe PCB and the meter probe enclosure has a sensor-to-surface distance of approximately 5.96mm. However, the theoretical minimum (taking sensor package and translucent overlay thickness into account) is 0.62mm.

I think the current design limits sensor visibility to an angle of approximately 23 degrees, which might be sufficient, but we should be able to do better.

The next revision of the meter probe enclosure should make more of an effort to reduce the thickness of the enclosure about the sensor. This may be difficult due to the inherent thickness of the heat-set screw inserts used to hold the shell together, unless the front of the device is redesigned to use clips/tabs to hold itself together.

(Getting clips/tabs to work properly may be difficult with the tolerances of home FDM 3D printing, but may work fine with commercial multi-jet-fusion 3D printing.)

dkonigsberg commented 1 year ago

Closing as this is just general design guidance at this point, and not a specific task.