README.md

Pi4J :: Java I/O Library for Raspberry Pi :: Device :: HD44780U LCD

Uses SN74HC595 to update D0-D7 of the LCD display module

This repository contains device specific support for various devices.

This is an example implementation and will need to be adjusted to fit your needs.

Project by Tom Aarts

2X40 LCD. 1602A

Controlled by Pi GPIOs, data lines controlled by 8 bit shift register.

1602A https://www.sparkfun.com/datasheets/LCD/ADM1602K-NSR-FBS-3.3v.pdf

Shift register https://www.ti.com/product/SN74HC595

HD44780U details Pi LCD1602 Grnd Write always rw GPIO17 rs GPIO27 en NC Not possible on Pi bf Grnd VSS 5VDC VDD 5VDC V0 5VDC A Grnd K

SN74HC595 LCD1602 QA D0
QB D1 QC D2 QD D3 QE D4 QF D5 QG D6 QH D7

SN74HC595 details 9 8 gnd

gpio13 10 7 QH Red LED
gpio6 11 6 QG
gpio5 12 5 QF
gpio20 13 4 QE
gpio23 14 3 QD
QA 15 2 QC Green LED Vdd 5v 16 1 QB

1. ./mvnw clean package
2. cd target/distribution
3. sudo ./runHD44780U_LCD1602A.sh parms........

sudo ./runHD44780U_LCD1602A.sh -rs 17 -en 27 -ds 23 -oe 20 -st 5 -mr 13 -sh 6 -rd 0x84 -t trace -line1 aBc -line2 XyZ

Clears display, Line1 begins in fourth position, line2 begins in second position sudo ./runHD44780U_LCD1602A.sh -rs 17 -en 27 -clearLCD -ds 23 -oe 20 -st 5 -mr 13 -sh 6 -rd 0x84 -t trace -line1 aaaaaa -line1Offset 4 -line2 zzzzzz -line2Offset 2

Param -shiftL 2 shift both lines 2 positions to left