p.s. with regard to the instability of the Ras Pi, could it be that i need to arrange a common ground or something?
I got the skywatcher eq3 mount (PC direct mode) connected to the Ras Pi via an usb cable to the remote control of the mount. so there are two power adapters i.e. a 12V for mount and a 5 volt for the Ras Pi.

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