I need a sensor to determine when the assembly has moved to the beginning. I was thinking of using an optical sensor to do it. Once I've determined the start position, I can just count stepper steps to know where exactly I am in reference to it. To the right is the schematic of the circuit I'm building. I'm using Osram's SFH9315 slotted sensor. It consists of a LED as emitter on one side and a phototransistor as sensor on the other side.
Here's the completed circuit:
Now I just need to figure out how and where to mount it on my table.
And here it is:
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