I keep thinking, "i can finish without asking more questions" but then...
http://www.mouser.co...R=612-WBL2UEERQ
Can you explain how to wire the spec'd calibration button? Any mounting ideas? There are 8 pins, and it doesn't seem to be momentary (the button stays down when pressed, and pops up on second press.) When down, I get continuity between pins 1 and 2.
On the photo, I put in a bank of 3 of these on the coin door (picked up at a closing Radio Shack). But they're not momentary. is momentary required? The lighting is not important to me.
The calibration button really should be momentary. They do make momentary variations of that switch - here's the one I use:
http://www.mouser.co...WBL2UOABQR05CLR
(And here's the secret decoder ring for the part number, in case you're looking for other variations: https://www.e-switch...ch#.WYt8J1WGNaQ.)
For calibration wiring for any switch (these or any other type), find the two terminals that conduct when (and only when) the switch is in the ON position, and connect those to the CAL BTN pins on JP3 the expansion board. The order doesn't matter.
If you do want to connect the light, connect it to the +LED- pins on JP3. The order of those does matter as the LED has a (+) and (-) terminal. In the case of the WBL switches, simply connect the (+) on JP3 to the (+) switch terminal labeled on the diagram, and (-) on JP3 to the switch (-) terminal. The light is actually kind of useful for the cal button, because you have to hold it down for a few seconds to enter calibration mode. The light gives you feedback to tell you when you've held it down long enough.
Note that you can also dispense with the button entirely since you can enter calibration mode from the config tool instead.
For mounting, these switches are really designed to be mounted on a little printed circuit board, but barring that you can improvise something with a little sheet metal holder and whatever you can figure out to attach them. Maybe improvised clips, or simply epoxy. One of my to-do items is to come up with a small circuit board for mounting a bank of these switches and a 3D printable mounting bracket, but I'm afraid it's still just a to-do item at the moment.
I totally forgot about the Calibration button for my install. I got used to just pulling up the calibration screen on the Pinscape Utility, and once calibrated a few weeks (months now?) ago I haven't had the need to recalibrate the plunger, it's been bang on all this time.
Yeah, calibration is pretty much a one-time step. If you had to do it frequently, having a special button for it would be nice as a convenience, but the button is pretty unnecessary given how rarely you have to calibrate in practice.