I am trying to build an optical sensor for my old school, state property, standard french watt-o-meter. EDF ( Electricité de France ) has a gig which turns a wheel depending on watt consumption. The higher the wattage, the faster a tiny disk turns.
Now the disk can be read by eye, so here is my question: why not use a hacked optical mouse to gather data ?
The contraints are:
- can't open the gig
- the wheel is 1.5 cm away from a protective glass
- I have an optical mouse
The CMOS has a half milimeter opening, and a 2mm lens from the standard casing.
What optical system do I need to read half milimeters from 15 milimeter distance using a classic optical mouse?
Can anybody help me calculate the correct lenses for this, or point me in the right direction?