Inside of an optical computer mouse

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Today i bought a simple 150 Baht computer mouse just to get one part: the optical sensor. My plan is to connect it to an Arduino and get a nice movement sensor for projects. If you look at the parts there is some useful stuff. Like the rotation sensor and a very nice wheel with silicon coating for a roboter. The switches are good as well, as they have two wholes in them. Easy to attach an extension wire.