hey mates! this is my first post here at arduino forums..
iam looking for a sensor that capable of sensing food bacterias(in able to know if the food is still good to consume) this is a part of a project that i'm thinking..
as well as water quality sensor that can be develop to identify if a water is having impurities and if its safe to drink.
sorry for my bad grammar..
ps. please suggest some projects concerning security(android based / gsm based / medical or other projects that can be use by a community.. your ideas is a big help for me