Hi Jonathon, Thanks for the reply and message.
A third servo has now stopped working, this time on a single-pointer gauge that previously was configured sensibly. I don’t think the issue is necessarily just related to some gauges being double pointers, although I admit that double gauges have an extra potential of the pointers clashing with one another. The gauges are very simple. They all have a pair of plastic gears to allow the dials to rotate at greater than 180 degrees permitted by the Top Power SG90 servos. The double gauges have a concentric shaft which is very loose and easy to keep the pointers clear of one another. Maybe there was a problem there at first that I hadn’t noticed.
The single gauge that has stopped working, seemed to suddenly make distress noises and became very hot. After quickly shutting the system down I realised it had become permanently damaged. What I would like to understand better is: what are the fragility issues of the cheaper “hobby” servos, and how to avoid them. How can the Pololu utility software help avoid these issues in the set-up process? Since the gauges are geared, they do not need to use the whole 180 degree movement of the servo to cover the atmost 45 degree dial.
I presumed that leaving some slack at each end of the rotation using the Maestro utility minimum and maximum parameters would stop the servos being driven beyond the end points and hence overheating?? The Maestro documentation doesn’t seem to discuss these sort of issues. Am I misunderstanding how these things operate?
My power supply a large PC-type that supplies 3 voltsges (3.3,5,and 12 volts) at very large ampage. I think the 5v actually measures about 5.2 volts off-load.
Thanks again for help