I think the best way to indicate that a continuous rotation servo is at a theoretical center would be to capture the value of the servo when it is stopped and use that value as the current center for the rest of the code to work from. Every time the servo stops, this value is re-determined. But I would not know how to code this. A quick test of your write.() suggestion indicated I need to code another function block so I will work on that as well as the rest. Thanks again!!