Hi I was wondering if anyone has experience with photo sensors that can lead me in the right direction. The photo sensor I am trying to find will be used to act like a switch to turn off a motor but the actual "switch" is going to be a chemical reaction that gets darker over time. Once it gets dark, the motor will turn off. I was wondering if anyone knew which type of photo sensor would be good for measuring the opacity of the solution? Also are there any type of photo senors that are sealed, so that we can put it in the solution? Or would putting the sensor in the solution be a bad idea?

Thank You in advance!!

 

I would use one of these devices - http://www.taosinc.com/productfamily.aspx?sel=ltv - and a voltage comparator to select the level of opacity.

 

Thanks beenthere that is what I need.

 

Good luck!

 

Also try http://www.optek.com/products.asp#Turbidimeters as another option.

Beecher.

 

Hey thank you Beecher for that link, but I think those sensors might be too much for what I need. It needs to be accurate, but not that accurate.