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Hello Alistair,
Good job, looks great - I can answer your questions :
If you set the step period in software it is stored in the controller (EEPROM). This value is applied to both manual and PC based control inputs. The manual control was intended for fine tuning the focus rather than large movements. Therefore, if the manual control is spun faster than the software debounce period input will be lost.
When temperature compensation occurs is generally a function of the client software rather than the focuser driver. The focuser driver has no knowledge of what the camera is doing and so the client enables/disables temperature compensation (or should) when subs are being taken. So when I sub is underway temperature compensation should be disabled.
Just to clarify, the step period does not change the physical step size delivered by the motor but instead the length of time energy is delivered to the motor. The physical step size of the motor is a function of the motor design and the attached gearbox. The 35BYJ motor delivers 2048 steps per revolution and this is fixed with the current firmware design. As you change the step period the motor will speed up or slow down but the number of steps per revolution stays the same. Each motor will tend to have a sweet spot where speed and torque are optimum.
Hope this helps ?
Cheers & clear skies (raining here as usual),
Dave
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