Arduino Bumper Vertical Mount

I like Chu's bumper, but I needed to mount it at a right angle on a small omniwheel robot. The center hole is covered by the shield socket, but I left it there anyway. You could use it to mount with a flat head bolt before installing the board, for example. However, in my case, I'm using the two end holes which are spaced to fit a (so far unpublished) robot base.

The bolt holes are deliberately a little small so a bolt will bite into it (almost self tapping) although I suggest using a nut on