I am pretty new to arduino, sensors and even basic electronics so, please, forgive any excessive naivety.
For my project I would need to trigger a countdown when water in a glass tube (around 0.5 cm diameter) rises up to a specific level (or falls down). This trigger should react quite promptly (milliseconds response would be ideal)
Do you think that this photo interrupter sensor could be used?http://www.cooking-hacks.com/index.php/photo-interrupter-os25b10.html
I suppose that the tube full of water should have a stronger absorbance in the IR region than when empty.
My doubts are:
1) The difference in light intensity would be to small to be detected reliably?
2) Would the glass have a too strong absorbance so that no meaningful detection can be performed?
Any suggestion for alternative sensors?
Thank you in advance.