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Connecting a PC1202 LCD Display to the
DevBoard-M32
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We now stock a small, affordable LCD display
that is
very easy to use with the DevBoard-M32. It can be interfaced
directly to the M32 without any other components.
About the PC1202-A
This compact display has 2 rows of 12 characters and
has an LED backlight. It has 4 notches for screw mounting and a
ribbon cable connector that's about 4" long. The display
requires a single 5v power supply including the voltage for contrast. This
removes the need for a power inverter to produce a negative voltage.
6 I/O lines, 3 ground connections and 2 power
connections are needed to operate the PC1202-A. All of these connections
are available on the M32.
To use the PC1202-A with the M32, you need to:
- Modify the LCD Connector
- Connect the LCD to the DevBoard-M32
- Program the DevBoard-M32
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Modify the LCD Connector
You can keep the 2x8 IDC connector if you like, but
for this example, I am going to remove it and use crimp connectors
that can plug directly into the DevBoard-M32. You could also plug a 2x8
male header into the connector and extend wires to the M32.
The first step is to cut off the connector and
separate the wires.
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Step1
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We only use 4 of the data lines, so we can remove the 4
other data lines, 7-10.
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Step 2
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Next, strip the ends and crimp on standard
square post MT connectors. These will plug onto the square post
headers on the M32.
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Step 3
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Arrange the lines into groups if you have MT
housings - group the lines as shown in the picture.
Lines 1,3, 5 into a 3-pin housing (Plug into the
Ground pins on the power bus).
Note: Pin 3 is the display
contrast. Typically grounding this pin provides the correct contrast if
the backlight is on. If you don't see any text or the text is black boxes,
you may need to connect a variable resistor to this line. Connect on leg
of the variable resistor to +5v and the other to ground. Then connect the
wiper to Pin 3 on the LCD.
Lines 2 & 15 into a 2-pin housing (Plug into the
+5V pin on the power bus)
Lines 4 & 6 into a 2-pin housing (Plug into the
I/O header)
Lines 11,12,13,14 into a 4-pin housing (Plug into
the I/O header)
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Step 4
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Connect to the DevBoard-M32
Connect the lines as shown in the table below:
| 1 (Brown) |
GND |
9 (White) |
NC |
| 2 (Red) |
+5V |
10 (Black |
NC |
| 3 (Orange) |
GND |
11 (Brown) |
PortC.2 |
| 4 (Yellow) |
PortC.4 |
12 (Red) |
PortC.1 |
| 5 (Green) |
GND |
13 (Orange) |
PortC.0 |
| 6 (Blue) |
PortC.3 |
14 (Yellow) |
PortD.7 |
| 7 (Purple) |
NC |
15 (Green) |
+5V |
| 8 (Gray) |
NC |
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Step 5
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Program the DevBoard-M32
Once the hardware is connected, use the code listed
below to test it
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'PC-1202-A LCD
Example Program
'Wright Hobbies,LLC
'http://www.wrighthobbies.net
'Dimension Variables
Dim Text(10)
As String
* 12
Dim I As
Byte
'Configure the type of LCD Display
'The display is has 12 viewable characters
'but the chipset uses 16 characters
Config Lcd
= 16 * 2
'Configure the pins used for the LCD display
Config Lcdpin =
Pin , Db4 = Portc.2
, Db5 = Portc.1
, Db6 = Portc.0
, Db7 = Portd.7
, E = Portc.3
, Rs = Portc.4
'Prep the LCD Display
Cls
Cursor Off
'Define the Text Messages
Text(1) =
"DevBoard-M32"
Text(2) =
"Small, Fast "
Text(3) =
"& Affordable"
Text(4) =
"Robotics "
Text(5) =
"Controller "
Text(6) =
"Based on the"
Text(7) =
"Atmel AVR "
Text(8) =
"ATMega-32 "
Text(9) =
" "
Text(10) =
" "
'Main Program
Do
For I = 1
To 9 Step
2
Locate 1 ,
1 'Row 1, Column 1
Lcd Text(i)
'Display the first row text
Locate 2 ,
1 'Row 2, Column 2
Lcd Text(i
+ 1) 'Display
the 2nd row text
Wait
2 'Wait
2 seconds
Next I
Loop
End
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