• It depends what kind of 'switch' you want to have... take a look at hall-effect-applications. It may give you some ideas. For the actual device it matters what additional electronics it has built in transforming the hall effect. For some applications you want to have it work as a switch - digital - and for some you want to have it as a gradual measurement - analog - and either behavior plus additional one is the additional electronics measuring the magnetic flux.

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