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you can power the Raspberry Pi through its RJ45 network connector
Speed adjustment way: Potentiometer
DIY Battery Powered Mini Metal Tank
and sample code
it's completely free to run
6V DC DIY Dosing pump Peristaltic (82) Limit Switch you can power the Raspberry6V Mini Dosing pump This 6V Mini Dosing pump is small size dosing pump for water, chemicals, liquids, and disinfectants. The peristaltic pump has a silicone tube through which the fluid is pumped, which does not come into contact with the pump components, making it completely sealed and safe. It is used in aquariums, medical equipment, or for pumping aggressive fluids. It is also used for the distribution of chemicals, fertilizers, detergents, and
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