added mikey's char LCD + example code

Author: raspberry@adafruit.com

Adafruit_CharLCD/Adafruit_CharLCD.py

@@ -0,0 +1,103 @@
+#!/usr/bin/python
+
+#
+# based on code from lrvick and LiquidCrystal
+# lrvic - https://github.com/lrvick/raspi-hd44780/blob/master/hd44780.py
+# LiquidCrystal - https://github.com/arduino/Arduino/blob/master/libraries/LiquidCrystal/LiquidCrystal.cpp
+#
+
+import RPi.GPIO as GPIO
+from time import sleep
+
+class Adafruit_CharLCD:
+
+    def __init__(self, pin_rs=24, pin_e=23, pins_db=[17, 21, 22, 25]):
+
+        self.pin_rs = pin_rs
+        self.pin_e = pin_e
+        self.pins_db = pins_db
+
+        GPIO.setmode(GPIO.BCM)
+        GPIO.setup(self.pin_e, GPIO.OUT)
+        GPIO.setup(self.pin_rs, GPIO.OUT)
+
+        for pin in self.pins_db:
+            GPIO.setup(pin, GPIO.OUT)
+
+	self.write4bits(0x33) # initialization
+	self.write4bits(0x32) # initialization
+	self.write4bits(0x28) # 2 line 5x7 matrix
+	self.write4bits(0x0C) # turn cursor off 0x0E to enable cursor
+	self.write4bits(0x06) # shift cursor right
+        self.clear()
+	
+
+    def clear(self):
+
+	self.write4bits(0x01) # command to clear display
+
+	# 2000 microsecond sleep, clearing the display takes a long time
+	sleep(.002)
+	#self.delayMicroseconds(2000)
+
+    def write4bits(self, bits, char_mode=False):
+        """ Send command to LCD """
+
+	# 1000 microseconds sleep
+	# sleep(.001)
+	self.delayMicroseconds(1000)
+
+        bits=bin(bits)[2:].zfill(8)
+
+        GPIO.output(self.pin_rs, char_mode)
+
+        for pin in self.pins_db:
+            GPIO.output(pin, False)
+
+        for i in range(4):
+            if bits[i] == "1":
+                GPIO.output(self.pins_db[::-1][i], True)
+
+	self.pulseEnable()
+
+        for pin in self.pins_db:
+            GPIO.output(pin, False)
+
+        for i in range(4,8):
+            if bits[i] == "1":
+                GPIO.output(self.pins_db[::-1][i-4], True)
+
+	self.pulseEnable()
+
+
+    def delayMicroseconds(self, microseconds):
+	seconds = microseconds / 1000000	# divide microseconds by 1 million for seconds
+	sleep(seconds)
+
+
+    def pulseEnable(self):
+	GPIO.output(self.pin_e, False)
+	self.delayMicroseconds(1)		# 1 microsecond pause - enable pulse must be > 450ns 
+	GPIO.output(self.pin_e, True)
+	self.delayMicroseconds(1)		# 1 microsecond pause - enable pulse must be > 450ns 
+	GPIO.output(self.pin_e, False)
+	self.delayMicroseconds(1)		# commands need > 37us to settle
+
+
+    def message(self, text):
+        """ Send string to LCD. Newline wraps to second line"""
+
+        for char in text:
+            if char == '\n':
+                self.write4bits(0xC0) # next line
+            else:
+                self.write4bits(ord(char),True)
+
+
+if __name__ == '__main__':
+
+    lcd = Adafruit_CharLCD()
+
+    lcd.clear()
+    lcd.message("  Adafruit 16x2\n Standard LCD")
+

Adafruit_CharLCD/Adafruit_CharLCD_IPclock_example.py

@@ -0,0 +1,22 @@
+#!/usr/bin/python
+
+from Adafruit_CharLCD import Adafruit_CharLCD
+from subprocess import * 
+from time import sleep, strftime
+from datetime import datetime
+
+lcd = Adafruit_CharLCD()
+
+cmd = "ip addr show eth0 | grep inet | awk '{print $2}' | cut -d/ -f1"
+
+def run_cmd(cmd):
+        p = Popen(cmd, shell=True, stdout=PIPE)
+        output = p.communicate()[0]
+        return output
+
+while 1:
+	lcd.clear()
+	ipaddr = run_cmd(cmd)
+	lcd.message(datetime.now().strftime('%b %d  %H:%M:%S\n'))
+	lcd.message('My IP: %s' % ( ipaddr ) )
+	sleep(2)