I need to drive a stepper motor, but I want to connect it to a seperate +V then the stamps. Is it possible to connect both the grounds (From Basic Stamp VSS and +9v DC adapter) on the same bus?
Yes, in fact you must do this otherwise you won't be able to control the stepper from the BASIC Stamp. This is a common source of error: NOT connecting grounds together (the only time you would not do this is when using optical isolation between circuits).
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Applications Engineer, Parallax
Dallas Office
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Jon Williams
Applications Engineer, Parallax
Dallas Office