Figure 7. Use spacers to separate the two mounting acrylic pieces.
mount the LCD on the underside of the panel. Place the
LCD under the panel and mark the four 1/8-inch holes.
If you want to mount the keypad on top of the panel,
you only need to cut a small slit for the connector header to
fit into. You can do this with a series of holes. Once the
keypad is in place, you can mark the holes needed for
mounting. The Universal LCD Carrier has a mounting kit
available that has all the hardware to mount the LCD Carrier
and a keypad. It also includes mounting instructions.
If you decide you don’t want handles, you should not
drill the 1/4-inch handle holes. I like the handles, as they
give me something to grab when I move the UUM. They
also help protect the LCD and switches if the UUM is
dropped, but most importantly, they look cool.
Use the top panel as a template to mark the spacer
holes on the bottom panel. These are 1/8-inch holes, as well.
on the front. Note that the LCD does not come with a
header. The Universal LCD Carrier comes with a male
header that mates with the female installed on the carrier.
Install this header on the LCD per the instructions that
come with the carrier.
It’s important that you use the proper spacers under
the LCD, which vary, depending on how you are mounting it. For the cutout, a single #2 nut and nylon spacer is
used. I recommend the Universal LCD mounting kit, as all
the hard-to-locate hardware is included.
We are not attaching the Universal LCD Carrier to the
LCD at this time. We will do that later.
Shown in Figure 9 is a 3 x 4-matrix keypad. Only seven
of the eight pins on the keypad are used. All Electronics
has two keypads that work perfectly and have the same
size footprint. Circuit Specialists also sells a keypad that
will work with only a slight change in size and footprint.
Mount the keypad to the panel as shown in Figure 10.
Mount the Utility Carrier to the panel with the included mounting hardware. The carrier comes with mounting
Mount the three switches as shown in Figure 10. The
first switch can be an SPST or an SPDT switch. It’s used
as an on/off switch. The two red switches shown in Figure
11 are DPDT on/off/on three-position switches. Circuit
Specialists sells these three-position switches.
Mount the LCD to the board. Use two 1/2-inch #2
machine screws on the rear and two one-inch #2 screws
You have a few choices regarding handles. All
Electronics and Jameco both sell rack handles. The handles shown in Figure 7 are from Jameco, Part #216821.
They don’t come with mounting
Figure 8. The top panel follows this layout using a 4 x 7 x 1/8-inch sheet of acrylic.
NUTS & VOLTS
Figure 9. A typical keypad.