Motorizing the summer-house valve with four transistors
My family's summer-house garden tap is fed by a manual valve buried half a metre down in the workshop floor, under a shelf. Step one of replacing it: I drive a CWX-15Q motorised ball valve (CR05) from a single switch using a four-transistor circuit — no microcontroller — that runs the one-way motor to the position I pick and cuts power at the valve's limit switches. For fun, and tested on a breadboard.
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