In my last post about the Lunar Clock I described the opto-interrupter that will detect the slot in the lunar images disk. At that time I wasn’t sure how to mount the opto-interrupter to the strip that holds the stepper motor that turns the lunar images disk.
Recently I bought an angle bracket to mount the opto-interrupter. Although it’s the smallest bracket I could find, it’s still pretty big, with holes that are far too large for my use.
So I used a hacksaw to cut one side of the angle bracket down to a size I could use.
Next I drilled new, smaller mounting holes the size of the short bolts I have used in the clock.
I then bolted the opto-interrupter to the bar of wood that holds the stepper motor.
In my next post, I cost-reduce the electronics by swapping the Arduino, etc. for an IoT microcontroller.
UPDATE: I’ve switched to using 3D printed parts, which require almost no assembly. I’ve written a post about the 3D printed clip that holds the photo interrupter – it’s much simpler than the process described here.