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Be sure to solder the socket to the reverse
of the main U3S PCB!! Not the top side! it
is very hard to fix later, if you get this
wrong!
Bolt together the LCD module and the PCB,
with the 16-way connectors in place but not
soldered. Then when you solder them, you will
ensure perfect alignment. Use the eight 6mm M3 screws, and four 12mm nylon hex spacers, to bolt
the PCB to the LCD.
The combined 16-way plug and socket when
mated together, have a height of a little under
12mm. Therefore it is necessary to have a
gap somewhere.
My suggested method is illustrated to the right
here. Closely mate the plug and socket. Leave
the gap between the male header (plug) and the U3S PCB. I have found this method works
successfully.
As you can see in the photo, the remaining pin length poking through to the component side of the
U3S PCB is short. However, the pins are still present in the holes and solder will fill the holes and
connect to the pins.
At this stage, also solder the pins of the 16-way socket to the LCD module.
4.3 Module assembly
First the microcontroller IC1 should be inserted in its socket. Be sure to align the microcontroller chip
correctly. The dimple on the chip must be at the same end as the dimple on the socket, and the dimple on
the silkscreen legend on the PCB.
Next, plug together the three modules as shown in the following photographs.
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