UKHeliBob-
I thought I did answer before, but do not see the post...:
No, the Arduinos will only drive servos, 8 per PRO Mini, to control turnouts on my model railroad.
I will need 16-17 servos, so two PRO Minis and one or two manual controls will do. Basically this is only
using Arduino as a PWM-generator (with many individual outputs).
Since my last post your suggested code is now tested, and works just like it should. What remains is
finetuning servo angles, and preferably slowing down servo movement.
Thanks again !
Peter