Mounted the Lunar Clock opto-interrupter

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.

the angle bracket holes are too large
the angle bracket holes are too large

So I used a hacksaw to cut one side of the angle bracket down to a size I could use.

hacksawing the angle bracket, using a board as a guide
hacksawing the angle bracket, using a board as a guide

Next I drilled new, smaller mounting holes the size of the short bolts I have used in the clock.

drilling the base mounting holes
drilling the base mounting holes
drilling the size hole that will connect to the opto-interrupter
drilling the size hole that will connect to the opto-interrupter

I then bolted the opto-interrupter to the bar of wood that holds the stepper motor.

Opto-interrupter fastened to the clock
Opto-interrupter fastened to the clock

In my next post, I cost-reduce the electronics by swapping the Arduino, etc. for an IoT microcontroller.