i have a lot of electronic devises and i want to know if i can use them
STC945 is a transistor/amplifier. I just googled that.CD players will have motors in them for sure. You may be able to drive these from the Arduino. Lots of stuff online for how that can be done.Laptops usually have a sensor to tell the laptop when the screen is shut. You may also get power supply components. The screen may be usable, but it will take some work. Most laptops I find useless to a great extent as the components are very densely packed and generally surface mount.Smartphones are in the same category - densely packed and hard to take apart usable components. Some of the older smatphone may have screen that you can use - google the model and see what other have done.Mouse has switches. Old style ball mouse will have optical encoders.Bottom line is that you just need to take them apart and have a look.
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