Create LCD_Examples_4Line_Display.py

A demo of some of the built in helper functions of the Adafruit_CharLCDPlate.py This is 20x4 display specific for now. I'll add conditions to get it to run on 16x2, etc.

Author: rainierez

Adafruit_CharLCDPlate/LCD_Examples_4Line_Display.py

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+#!/usr/bin/python
+
+#----------------------------------------------------------------
+# Author: Chris Crumpacker                               
+# Date: May 2013
+#
+# A demo of some of the built in helper functions of 
+# the Adafruit_CharLCDPlate.py This is 20x4 display specific for now.
+# I'll add conditions to get it to run on 16x2, etc.
+# 
+# Using Adafruit_CharLCD code with the I2C and MCP230xx code aswell
+#----------------------------------------------------------------
+
+numcolumns = 20
+numrows = 4
+
+from time import sleep
+from Adafruit_CharLCDPlate1 import Adafruit_CharLCDPlate
+
+lcd = Adafruit_CharLCDPlate()
+
+lcd.begin(numcolumns, numrows)
+
+lcd.backlight(lcd.ON)
+lcd.message("LCD 20x4\nDemonstration")
+sleep(2)
+
+while True:
+    #Text on each line alone.
+    lcd.clear()
+    lcd.setCursor(0,0)
+    lcd.message("Line 1")
+    sleep(1)
+    
+    lcd.clear()
+    lcd.setCursor(0,1)
+    lcd.message("Line 2")
+    sleep(1)
+    
+    lcd.clear()
+    lcd.setCursor(0,2)
+    lcd.message("Line 3")
+    sleep(1)
+    
+    lcd.clear()
+    lcd.setCursor(0,3)
+    lcd.message("Line 4")
+    sleep(1)
+    
+    # Using the "\n" new line marker
+    lcd.clear()
+    lcd.setCursor(0,0)
+    lcd.message("Line 1")
+    sleep(1)
+    
+    lcd.clear()
+    lcd.setCursor(0,0)
+    lcd.message("Line 1\nLine 2")
+    sleep(1)
+    
+    lcd.clear()
+    lcd.setCursor(0,0)
+    lcd.message("Line 1\nLine 2\nLine 3")
+    sleep(1)
+    
+    lcd.clear()
+    lcd.setCursor(0,0)
+    lcd.message("Line 1\nLine 2\nLine 3\nLine 4")
+    sleep(1)
+        
+    # Auto line limiting by length as to not overflow the display
+    # This is line by line and does not to any caraige returns
+    lcd.clear()
+    lcd.setCursor(0,0)
+    lcd.message("This String is 33 Characters long",1)
+    sleep(2)    
+    
+    lcd.clear()
+    lcd.setCursor(0,0)
+    lcd.message("This String has elpise",2)
+    sleep(2)    
+    
+    #Scroll text to the right
+    messageToPrint = "Scrolling Right"
+    i=0
+    while i<20:
+        lcd.clear()
+        lcd.setCursor(0,0)
+        suffix = " " * i
+        lcd.message(suffix + messageToPrint,1)
+        sleep(.25)
+        i += 1
+    
+    # Scroll test in from the Left
+    messageToPrint = "Scrolling Left"
+    i=20
+    while i>=0:
+        lcd.clear()
+        lcd.setCursor(0,0)
+        suffix = " " * i
+        lcd.message(suffix + messageToPrint,1)
+        sleep(.25)
+        i -= 1
+    sleep(2) 
+    
+    # Printing text backwards, NOT right justified
+    lcd.clear()
+    lcd.setCursor(0,0)
+    lcd.message("Right to left:")
+    lcd.setCursor(10,1)
+    lcd.rightToLeft()
+    lcd.message("Testing")
+    sleep(2)
+    
+    # Printing normally from the middle of the line
+    lcd.clear()
+    lcd.setCursor(0,0)
+    lcd.message("Left to Right:")
+    lcd.setCursor(10,1)
+    lcd.message("Testing")
+    sleep(2)
+    
+    # Enabling the cursor and having it blink
+    lcd.clear()
+    lcd.setCursor(0,0)
+    lcd.cursor()
+    lcd.blink()
+    lcd.message("Cursor is blinking")
+    lcd.setCursor(0,1)
+    sleep(3)
+    lcd.noCursor()
+    lcd.noBlink()
+    
+    # Turning the backlight off and showing a simple count down
+    lcd.clear()
+    lcd.setCursor(0,0)
+    lcd.message("Backlight off in")
+    lcd.setCursor(0,3)
+    lcd.message("Back on in 3sec")
+    lcd.setCursor(17,0)             #Reseting the cursor here keeps us from having to clear the screen, this over writes the previous character
+    lcd.message("3")
+    sleep(1)
+    
+    lcd.setCursor(17,0)
+    lcd.message("2")
+    sleep(1)
+    
+    lcd.setCursor(17,0)
+    lcd.message("1")
+    sleep(1)
+    
+    lcd.backlight(lcd.OFF)
+    lcd.clear()
+    lcd.setCursor(0,0)
+    sleep(3)
+    lcd.backlight(lcd.ON)
+    lcd.message("Backlight on")