16 X 2 LCD Input Text and Display

Here is a more practical program that asks you to input text and then displays that text on the LCD display.  The challenge here was to parse the input text so that words were not broken up.  Click on the video to see it work:

Here is python code for this program:

	#!/usr/bin/python
	# For two line dispalys using the Hitachi HD4478U Disolay Driver Chip
	# Gets input from user and sends it to the display
	# The inputed text is parsed into segments no longer than 16 characters that
	# end in complete words.
	# Will breakdown on words that are over 16 characters in length.
	# First segment goes to line 1, the next to line 2, the next to line 1, etc.
	# MJL -- www.thepiandi.blogspot.com 0-- 3/23/2013
	from LCD_2X16 import *
	def getinput(): # inputs text and parses it into a list where each element is no more than 16 characters
	text = raw_input('Input your text: ')
	text = text + ' '
	listtext = []
	stop = False
	while stop == False:
	spacepos = -1
	index_pos = 0
	while spacepos < 16 and stop == False:
	spacepos = text.find(' ', spacepos + 1)
	if spacepos <= 16 and spacepos != -1:
	index_pos = spacepos
	if spacepos == - 1:
	stop = True
	if stop:
	if text != '':
	listtext = listtext + [text[:index_pos]]
	else:
	listtext = listtext + [text[:index_pos]]
	text = text[index_pos + 1:]
	return listtext
	def wait4switch():
	lcd_byte(LCD_LINE_1, LCD_CMD)
	lcd_string("Push My Button")
	lcd_byte(LCD_LINE_2, LCD_CMD)
	lcd_string(" Please")
	# wait for switch to be pressed
	input_switch = GPIO.input(SwitchInput)
	while input_switch:
	input_switch = GPIO.input(SwitchInput)
	# where it all happens
	outstrng = getinput() # Get dispaly string and parse
	wait4switch()
	TopLine = True
	for lineChars in outstrng:
	if TopLine == True:
	lcd_byte(0x01, LCD_CMD) # Clear Display
	lcd_byte(LCD_LINE_1, LCD_CMD)
	lcd_string(lineChars)
	TopLine = False
	else:
	lcd_byte(LCD_LINE_2, LCD_CMD)
	lcd_string(lineChars)
	TopLine = True
	time.sleep(3)
	if TopLine == False:
	time.sleep(3)
	lcd_byte(0x01, LCD_CMD) # Clear Display
	GPIO.cleanup()

view raw LCD_Display2Lines.py hosted with ❤ by GitHub

I apologize that the name of the program in the video (LCD_Module_1,py) does not match the name in the Gist file (LCD_Disploy2Lines.py). Somewhere along the way, after I made the video, I changed the file name to make the name more meaningful, at least to me.

The program does not take into account individual words of more that 16 characters in length.

Notice line 16 of the code. That makes LCD_2X16.py (discussed in the last post) part of this program.