|
LCD Module Control with PC
Click to enlarge
(Disable Automatic Image Resizing On Your Browser)
This simple circuit controls a popular 2-line x 16-character LCD by a PC via printer port.
It doesn't use the Bi-directional feature found on newer printer ports, thus it should
work with most, if no all Parallel Ports. These LCD Modules are very common these days,
and are quite simple to work with, as all the logic required to run them is on board.
The LCD panel's Enable and Register Select is connected to the Control Port. The Control
Port is an open collector / open drain output. While most Parallel Ports have internal
pull-up resistors, there are a few which don't. Therefore by incorporating the two 10K
external pull up resistors, the circuit is more portable for a wider range of computers,
some of which may have no internal pull up resistors. The 10k Potentiometer controls the
contrast of the LCD panel. The software source code has been written in Borland C++ .
Source Code (1KB)
Ask your question about this circuit in the forum.
|
