Once I had all my glass and electronics in place it was time to calibrate the sensor. Unfortunately as the weight of water has to pass through a layer of glass and a layer of plastic, by the time it reaches the sensor it was only causing a slight change in the reading.
To get past this final problem I raised the screen slightly so it would just touch the glass plate when in place. The glass plate was raised slightly using foam pads on the corners. This meant that the change in weight would be caused by the whole plate being pushed against the screen and in turn that being pushed against the sensor which was positioned underneath the centre of the screen. I finally managed to get a big enough change in weight that a difference in screen brightness became more noticeable.
There were still some slight annoyances which would need more in depth development. The material holding the glass plate in place would need to be more elastic as the foam I'm using flattens over time and stops supporting the plate. Also a different sensor could be tried. . .one that is more sensitive. When the water is poured in it isn't level so the change in brightness is never consistant and instead it flickers on. However there is no more that can be done at this time.
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