I2C-HD77480-LCD 0.1.1

LCD driver for HD4480 behind PCF8574

Introduction

CircuitPython library for HD77480 LCD character displays with an I2C backpack. Currently PCF8574 is supported. This project is a fork of dhalbert/CircuitPython_LCD. A second pin layout of the PCF8574 was added. This fork is only tested on a raspberry 4 with these device

The original code started with the RPLCD library by Danilo Bargen, in https://github.com/dbrgn/RPLCD, but it has been reworked considerably.

On SAMD21 (M0) boards, lcd/lcd.py is too big to use as .py. Use mpy-cross to convert the .py files into .mpy. Also, use the minimal branch, to save space, if you don’t need all the features in the main branch.

Usage Example

The LCD supports character LCDs using the HD77480 chip.

The interface to the LCD is separated into an Interface class. Currently there is only one such class: I2CPCF8574Interface.

from lcd.lcd import LCD
from lcd.i2c_pcf8574_interface import I2CPCF8574Interface,PinMapping

from lcd.lcd import CursorMode

import busio
import board

comm_port = busio.I2C(board.SCL, board.SDA)

# Talk to the LCD at I2C address 0x27.
interface = I2CPCF8574Interface(comm_port, 0x27, PinMapping.MAPPING2)

lcd = LCD(interface, num_cols=20, num_rows=4)

lcd.print("abc ")
lcd.print("This is quite long and will wrap onto the next line automatically.")

lcd.clear()

# Start at the second line, fifth column (numbering from zero).
lcd.set_cursor_pos(1, 4)
lcd.print("Here I am")

# Make the cursor visible as a line.
lcd.set_cursor_mode(CursorMode.LINE)