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Mounting the Bottom-Mount Parts
There are parts mounted on both sides of the WiFi Switch board, this is done to save space. It
does make the assembly task a little bit more complicated, but in general most of the smaller
parts are mounted on the "bottom" side of the board (i.e. the side that you don't see when it's
mounted in your AV bay), so the "top" side of the board is pretty easy. We're going to mount
the stuff on the bottom first, then when we're done we'll turn it over and mount the stuff on the
top side. All of the parts on the bottom side of the board are surface-mount, so we recommend
that you tape the board to your work table first to make it a little bit easier.
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Orient the board
Tape the board down to your work surface with masking tape, on the extreme left and right
sides so you don't cover any of the pads. The left side should be the side with the Eggtimer
WiFi Switch logo, the right side should be where the mounting holes are.
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Mount the Optoisolators
Locate the two spots for the optoisolators, they're the 8-pin pads on the left side of the board.
The optoisolators will be mounted so that the notch/pin is facing the left side of the board.
Note that some optoisolators don't have a notch/pin, but if the writing is right-side up then it's
positioned properly. We'll do the left one first, then you can do the right one the same way.
Tin the lower-right pad with just a little bit of solder. With tweezers, hold the optoisolator in
place, and heat the lead over the tinned pad until the solder melts. Keep the heat on for another
3-4 seconds, then remove the iron and let the pad cool.
Check the alignment of the optoisolator on the pads, all of the leads should be centered on the
pads. If not, heat up the lead and carefully move the optoisolator in place.
Once you're satisfied with the alignment, carefully solder the remaining leads to the pads,
waiting 15 seconds between each lead so that the device has a chance to cool down a bit.
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