micropython-lcd's Introduction

micropython-lcd

A simple class for controlling the HD44780 in 4 bit mode with the micropython pyboard.

There are no external dependences, the only module we use is the pyboard's pyb.

Micropython Forum thread: http://forum.micropython.org/viewtopic.php?f=2&t=354

Usage

import pyb
from lcd import HD44780

lcd = HD44780()

lcd.PINS = ['Y1','Y2','Y3','Y4','Y5','Y6']

lcd.init()

lcd.set_line(0) # First line
lcd.set_string("ABCDEFGHIJKLMNOP") # Send a string
lcd.set_line(1) # Second line
lcd.set_string("1234567890123456") # Again

pyb.delay(3000) # 3 second delay

lcd.clear() # Clear the display

Pinout

Hookup your LCD like the following.

Pin	Code	Description	Do what with it
1	VSS	GND	Ground it
2	VDD	+5V	5V please
3	V0	Contrast (0-5V)*	Stick to 0V if you don't have a pot
4	RS	Register select	Connect to pyboard, 0 in array
5	R/W	Read/write	Ground it
6	E	Enable	Connect to pyboard, 1 in array
7	DB0	Data Bit 0	Unused
8	DB1	Data Bit 1	Unused
9	DB2	Data Bit 2	Unused
10	DB3	Data Bit 3	Unused
11	DB4	Data Bit 4	Connect to pyboard, 2 in array
12	DB5	Data Bit 5	Connect to pyboard, 3 in array
13	DB6	Data Bit 6	Connect to pyboard, 4 in array
14	DB7	Data Bit 7	Connect to pyboard, 5 in array
15	A	Backlight +someV	My display is LED, I use 3.3V
16	K	Backlight GND	Ground it

Then the pinout array looks like this

PINS = ['Y1','Y2','Y3','Y4','Y5','Y6']

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micropython-lcd's Issues

Only update changed characters

Currently the set_string() function clears the entire display and rewrites the contents. This causes the display to 'flash'. It would be desired to only update changed characters when set_string() is called.

This is particularly obvious when making updates to the LCD with a short interval.

Will it work for STM32F407 discovery board

hello,
Can i use this code for STM32F407 discovery board as you have written it for Pi. And if yes, what are the settings i need to change in lcd.py file.

Thank you