LCD-ip-time-rasspberry

#!/usr/bin/python

import smbus import time

from datetime import datetime import socket import fcntl import struct

Define some device parameters

I2C_ADDR = 0x27 # I2C device address LCD_WIDTH = 16 # Maximum characters per line

Define some device constants

LCD_CHR = 1 # Mode - Sending data LCD_CMD = 0 # Mode - Sending command

LCD_LINE_1 = 0x80 # LCD RAM address for the 1st line LCD_LINE_2 = 0xC0 # LCD RAM address for the 2nd line LCD_LINE_3 = 0x94 # LCD RAM address for the 3rd line LCD_LINE_4 = 0xD4 # LCD RAM address for the 4th line

LCD_BACKLIGHT = 0x08 # On #LCD_BACKLIGHT = 0x00 # Off

ENABLE = 0b00000100 # Enable bit

Timing constants

E_PULSE = 0.0005 E_DELAY = 0.0005

#Open I2C interface #bus = smbus.SMBus(0) # Rev 1 Pi uses 0 bus = smbus.SMBus(1) # Rev 2 Pi uses 1

def lcd_init():

Initialise display

lcd_byte(0x33,LCD_CMD) # 110011 Initialise lcd_byte(0x32,LCD_CMD) # 110010 Initialise lcd_byte(0x06,LCD_CMD) # 000110 Cursor move direction lcd_byte(0x0C,LCD_CMD) # 001100 Display On,Cursor Off, Blink Off lcd_byte(0x28,LCD_CMD) # 101000 Data length, number of lines, font size lcd_byte(0x01,LCD_CMD) # 000001 Clear display time.sleep(E_DELAY)

def lcd_byte(bits, mode):

Send byte to data pins

bits = the data

mode = 1 for data

0 for command

bits_high = mode | (bits & 0xF0) | LCD_BACKLIGHT bits_low = mode | ((bits<<4) & 0xF0) | LCD_BACKLIGHT

High bits

bus.write_byte(I2C_ADDR, bits_high) lcd_toggle_enable(bits_high)

Low bits

bus.write_byte(I2C_ADDR, bits_low) lcd_toggle_enable(bits_low)

def lcd_toggle_enable(bits):

Toggle enable

time.sleep(E_DELAY) bus.write_byte(I2C_ADDR, (bits | ENABLE)) time.sleep(E_PULSE) bus.write_byte(I2C_ADDR,(bits & ~ENABLE)) time.sleep(E_DELAY)

def lcd_string(message,line):

Send string to display

message = message.ljust(LCD_WIDTH," ")

lcd_byte(line, LCD_CMD)

for i in range(LCD_WIDTH): lcd_byte(ord(message[i]),LCD_CHR)

def get_ip_address(ifname): s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) return socket.inet_ntoa(fcntl.ioctl( s.fileno(), 0x8915, # SIOCGIFADDR struct.pack('256s', ifname[:15]) )[20:24])

def main():

Main program block

Initialise display

lcd_init()

while True:

print( get_ip_address('wlan0'))
print (   datetime.now().strftime('%b %d  %H:%M:%S\n')   )
# Send some test
lcd_string("Muhammed",LCD_LINE_1)
lcd_string("Essa",LCD_LINE_2)

time.sleep(4)

# Send some more text
lcd_string(   get_ip_address('wlan0')     ,LCD_LINE_1)
lcd_string(   datetime.now().strftime('%b %d  %H:%M:%S\n')   ,LCD_LINE_2)

time.sleep(3)

if name == 'main':

try: main() except KeyboardInterrupt: pass finally: lcd_byte(0x01, LCD_CMD)