When switching on the fluorescent light in my shed workshop, a powered up servo (HS 311) briefly goes through some erratic movements - despite its 3 metre servo control wire being disconnected at the UNO end. Can I safely assume that, when it is connected and operating the sketch normally, such interference would have no adverse impact on the programmed behaviour?
The servo is powered from a regulated bench 5V supply, with 0.1uF near the servo. The UNO is supplied from either the same 5V, sometimes with the USB PC cable also connected. The pair of wires supplying the servo are about 2 metres away from the bench supply unit, which is about 50cm from the UNO.
Also, is this sort of spurious behaviour commonplace please?