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well if you don't have to sense distancec sharp infared will work for direction and to sens if there is any liquid in the container you could use a photo cell which will tell when the light is blocked there for contains liquid.Where do you live,the reason i ask is so i can post some links from local/suitable online shops with some suitable sensors
A photo cell would only sense if there is liquid in the container if there is an out side light source.i can not think of a sensor that would work in the dark of hand but one option is to mount a 3 or 5mm LED close to a photo cell to give it a light source untill the it is blocked by the liquid.and you can get really small photo cells, close to 4x9 mm and 1mm hight.Here is what a photo cell is and some different sizes.http://www.futurlec.com/Photocells.shtml
Hi I'm looking place where I could buy ready or to hire someone to make two sensors, first will react on change of tone of color or light going throw transparent plastic object, and second sensors reacts on change of relative position/movement of the object. Those sensors have to be a battery operates. Any advice and help is welcome, I'm very new to society of robots.Thank YouGarri[email protected]