The input is the height of the platform.
If you put in a constant height, the platform will go that height and stay there… with zero speed.
Recall that in order to pick up the payload, the payload must be a precise distance from the spuCraft AND that the payload must be moving at exactly the same speed as Pokey.
How are you going to match the speed?
In general, you can’t set the speed of the platform. You can only set the height. The only way you can set the speed of the platform is if you set the speed to zero.
Given this, I think the only way to rubustly pick up the payload is to pick it up when the velocity of the spuCraft is zero.
Is this enough for you to get going?
If so, then go. If you need more, continue by clicking here.