PCF8574-LCD

Raspberry Pi Python3 library for RB-LCD-16x2 and RB-LCD-20x4

This library is based on the CircuitPython_LCD library by dhalbert. The changes were necessary because of a different pinout used with the PCF8574 and a HD44780.

Pinout

PCF8574	LCD
P0	D4
P1	D5
P2	D6
P3	D7
P4	RS
P5	RW
P6	--
P7	EN

Dependencies

Before you install the library you need to activate i2c on your Raspberry Pi and install the following dependencies.

sudo apt update && sudo apt upgrade

sudo apt-get install i2c-tools python3-smbus libi2c-dev python3-pip

sudo pip3 install RPi.GPIO

sudo pip3 install adafruit-circuitpython-busdevice

Installation

git clone https://github.com/joy-it/PCF8574-LCD.git

cd ~/PCF8574-LCD/

sudo python3 setup.py install

Examples

cd ~/PCF8574-LCD/examples/

RB-LCD-16x2

python3 example-16x2.py

RB-LCD-20x4

python3 example-20x4.py

Library functions

• lcd.close() - closes LCD class
• lcd.set_display_enabled(value) - set display on and off with value: 0-off, 1-on
• lcd.set_cursor_mode(value) - sets cursor mode with value: 0-off, 1-blinks, 2-line
• lcd.set_cursor_pos(row, column)- sets cursor to position: row, column
• lcd.print(string) - prints String
• lcd.clear() - clears display
• lcd.home() - sets cursor to home position
• lcd.shift_display(amount) - shifts display with amount
• lcd.create_char(location, bitmap)- creates character with bitmap and location