lcd.py

#!/usr/bin/python  
      
import RPi.GPIO as GPIO
import time 
from time import sleep  
import sys
class HD44780:  
      
	def __init__(self, pin_rs=7, pin_e=8, pins_db=[25, 24, 23, 18]):  
      
            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.clear()  
      
        def clear(self):  
            """ Blank / Reset LCD """  
      
            self.cmd(0x33) # $33 8-bit mode  
            self.cmd(0x32) # $32 8-bit mode  
            self.cmd(0x28) # $28 8-bit mode  
            self.cmd(0x0C) # $0C 8-bit mode  
            self.cmd(0x06) # $06 8-bit mode  
            self.cmd(0x01) # $01 8-bit mode  
      
        def cmd(self, bits, char_mode=False):  
            """ Send command to LCD """  
      
            sleep(0.001)  
            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)  
      
            GPIO.output(self.pin_e, True)  
            GPIO.output(self.pin_e, False)  
      
            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)  
      
      
            GPIO.output(self.pin_e, True)  
            GPIO.output(self.pin_e, False)  
      
        def message(self, text):  
            """ Send string to LCD. Newline wraps to second line"""  
      
            for char in text:  
                if char == '\n':  
                    self.cmd(0xC0) # next line  
                else:  
                    self.cmd(ord(char),True)  
      
if __name__ == '__main__':  

	lcd =HD44780()
	lcd.message("Hi Vikas")
	time.sleep(1)