Fred,
Thanks a million for the notes, it all makes sense now. :) I was
pretty close, so it didn't take long to handle the backlight
connections.
However, it still doesn't work. Lights up, nothing on the display.
The firmware version is a bit old, but I can't update it right now.
What was the minimum version of firmware that supported LCD
operations? (I will update soon and hopefully get something on the
screen....)
Thanks,
STeve
On Sep 17, 2009, at 2:32 PM, Fred Hillhouse wrote:
PIN Symbol Level Function
1 VSS - GND(0V)
2 VDD - Supply Voltage for Logic(+5V)
3 V0 - Power supply for LCD <-- A pot between 5V and GND with the
wiper connected to PIN 3 works well. The contrast can be changed as
temperature changes.
4 RS H/L H: Data; L: Instruction Code
5 R/W H/L H: Read; L: Write
6 E H/L Enable Signal
7 DB0 H/L <-- not used
8 DB1 H/L <-- not used
9 DB2 H/L <-- not used
10 DB3 H/L <-- not used
11 DB4 H/L
12 DB5 H/L
13 DB6 H/L
14 DB7 H/L
==================
15 A - Backlight Power (+5V)
16 K - Backlight Power (0V)
These connections should have a current limiting resistor added in
series. At least on the ones I have used in the past. Actually a pot
here helps to adjust the brightness as needed with a series fixed
resistor.
