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Automatic Switch design using BC547

Hi,

I am working on a project where I need to design an automatic switch. I want to use it to control my water pump so that I don't have to manually turn it ON or OFF. Instead I wanna control it aautomatically with my mobile. I am an android developer myself so I can design the app thing but I am stuck with electronics and I am thinking of using BC547 transistor. Any help would be welcome.

Thanks.