This is my first project so it may not be very impressive. This costed arpund $10 to build however I am in the UK... What the project does: if the light level is high the LED/other load will be switched off, if the light level is medium the LED/load will flash and if the light level is low the LED/load will be on. The picture shows extreme breadboard packing, if the stripboard is cut very well and soldered accurately this project can fit inside a tic-tac packet nicely. It has been prototyped both on a simulator and on solderless breadboard and I can confirm it works. Yes, I know this could be done easily with an Arduino but really what would be the fun in that? (Arduinos are great!). I do not know wheher this project is worthy to be in a robot based forum.
This project is not finished, I have only a dirt quality soldering iron at the moment which is not useful for breadboard packing, I will complete once I have a heat adjust, fine tipped soldering iron. I will upload an image and schematics when finished.