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I would like to make the following suggestions.As tytower, I'am a bit disturbed by the power supply part, and especially by the fact that the 0vcc (ground) is floating with respect to the transformer. I suggest to use a more simple and adapted design (e.g.. one diode for +side, and one diode for -side ; this should work considering the low current).The author should also update the schematic which does not correspond to the actual design (eg. 3300uF/50v).The second order active pass filter is rather unusual, with capacitors of different values : 10nF and 220nF. I suggest to use capacitors of same value and to recalculate the capacitors (in addition, with the indicated values, I do not find the cutoff frequency of 160 Hz, but, I'm may be wrong).
Nice design !Just to make sure I properly understand: the laser beam goes through the Perspex with an angle of 45° and makesmultiple reflections inside the plastic and finally goes onto the sensor. Whena rain drop goes onto the surface, the reflection is disturbed and the opticalsignal rapidly changes. You measure the stability of the signal and when the sigmais high, you conclude that it rains. Is it the way it works ?Do you knowwhat happens when the Perspex surface is full of drops, or even is gettingdirty over the time ?
Hi ! See my answer in the included image. I am not very familiar with the image upload process. I hope it works.Best regards.
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