Hi Texas has several types of light to frequency converters with a high dynamic range. I think with this nearly any light measurement problem is easy with a pic Fernando -----Original Message----- From: Jason Harper To: Date: Domingo, 30 de Janeiro de 2000 11:54 Subject: Re: Light sensor (somewhat [OT]) > Sounds like a product to develop, especially if the output were > logarithmic and you could send it some sort of offset. A photo diode > would be best for that, having more range than a phototransitor. Well, a strange idea initially crossed my mind - use something like a PIC12C508/JW with its window uncovered for the sensor, basing its output on its initial RAM contents, which I believe is rather light-dependent (more light -> less randomness). However, I don't know if this effect is repeatable enough to be useful, and I was hoping for a solution that costs less than what a windowed PIC does... Hey, weirder things have been done - anybody remember that long-ago article (in Popular Electronics, I believe) for making a solid-state camera by removing the top of a certain brand of RAM chip? Jason Harper