What do you do with an extra Middleman board?

Build an optical end stop tester .... of course !

Lately I have been tinkering with end stops more than anyone should and while looking in my Smoothie conversion parts bin it occurred to me that I could use my extra Middleman board and connector to make an endstop tester.

Done .....

Schematic is here with use instructions:

Package is here, nothing impressive. It uses 2x 2016 button batteries and holder. :

Video is here:

Note: if you don't have a Middleman board you can make one of these using a FPC connector whose pins are soldered to the battery, switches and LED's see the schematic. 
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