LCD2LPT with LIRC
with Lirc" circuit is the
compilation of two circuits found on the net
on a single board. The first is LCD to LPT
interface and the second an IR remote control interface using
The main circuit for LCD connection to
LPT was modified adding a
contrast control using 4
push buttons. Responsible for the adjustment are the two DS1809
ICs made from Dallas-Maxim semiconductors
along with 2 buttons for each adjustment.
IC1 with the use of
S1(+, Up) and S2(-,
Down) controls the Contrast
of LCD and IC2 with
the use of S3(+, Up)
and S4(- , Down) and
the help of transistor T1, controls the
IC3 is a 7805 regulator
that stabilize the power line of the circuit.
There is also a filtering capacitor that helps the transient discharge
of the circuit preventing any damages to the ICs.
To JP2 you must apply 12V
and if you wish you can add a polarity protection
For the IR receiver you
must read the site
The only thing i have to add up is to remove
pin3 during contraction and read the
receiver's IC datasheet to help you out connecting it right.
An adaptor for the LCD is also included so you can
use a ribbon cable for the connection with the main circuit.
Download this project in .doc
Download PCB in pdf format
Download schematic, layout in pdf format