A.2.1 2 × 20 Character LCD
The 2 × 20 display does not have a backlight, so the jumpers on header J7 do not need to
be set, and may be left in place as is. This display uses the dual-row 2 × 8 connector. Two
ways are available to attach the display to the Keypad/Display interface.
1. To attach the 2 × 20 display directly to the Keypad/Display interface, solder a 2 × 8
socket to the bottom side of the display printed circuit board (the side that does not
have the actual display). The display can now be attached to the Keypad/Display inter-
face at header J4. Make sure that pin one on the display is aligned with pin 1 on J4.
2. A 6" flat ribbon cable (included with the Expansion Kit) can also be used to attach the
2 × 20 display. The cable has 2 × 8 female IDC connectors at each end. To use the
cable, solder a 2 × 8 header to the top side of the display printed circuit board (the same
side that has the actual display). Now you can use the 6" flat ribbon cable to connect the
display to header J4 on the Keypad/Display interface, making sure that pin 1 is con-
nected to pin 1 on both sides.
When you port this design to your own use, the ribbon cable can be up to 2 m long.
The LCDBASIC.C and PONG.C sample programs illustrate the use of the 2 × 20 display.
A.2.2 4 × 20 Character LCD
The 4 × 20 display has an LED backlight, and the factory-default jumpers at J7 are already
set to provide the necessary series resistance for the LED backlight. (The factory default is
for 2-pin jumpers across pins 3–4, 5–6, and 9–10, which provides a series resistance of
5.0 ? .)
The 4 × 20 display uses a 1 × 16 in-line connector interface. Three ways are available to
attach the display to the Keypad/Display interface.
1. Solder one end of the 1 × 16 male-male 4" flex strip into either the top or bottom side of
the LCD display printed circuit board. Press the other end is into the socket strip at J5
on the Keypad/Display interface. When installing the flex strip into J5, work from one
end towards the other, inserting 3 or 4 pins as you go. The flex strip provides a tight fit
to the socket strip. Make sure that pin 1 is connected to pin 1 on both ends of the cable.
When you port this design to your own use, the flex strip can be up to 2 m long.
2. The display can be connected directly to the Keypad/Display interface by first soldering
a 1 × 16 Hi-Rel pin strip onto the bottom side of the display printed circuit board (the
side that does not have the actual display). The pins on one side of the pin strip have a
slightly larger diameter than the pins on the other side. Solder the larger pins into the
display. Next press the display with the pin strip installed into J5 on the Keypad/Display
interface. Make sure that pin 1 is connected to pin 1 on both sides. The pin strip pro-
vides a tight fit. Working from the display side of the display, press directly above the
pins while working back and forth across the connector until it is fully seated into J5 on
the Keypad/Display interface. The connection was designed to be tighter than normal
so the display can stand off the side of the Keypad/Display interface without bending.
The ALPHANUM.C sample program illustrates the use of the 4 × 20 character display.
User ’s Manual
151
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