import RPi.GPIO as GPIO
import time
LCD_RS = 7
LCD_E = 3
LCD_D4 = 37
LCD_D5 = 35
LCD_D6 = 33
LCD_D7 = 31
LCD_WIDTH = 20
LCD_CHR = True
LCD_CMD = False
LCD_LINE_1 = 0x80
LCD_LINE_2 = 0xC0
E_PULSE = 0.0005
E_DELAY = 0.0005
def main():
GPIO.setmode(GPIO.BOARD)
GPIO.setup(LCD_E, GPIO.OUT)
GPIO.setup(LCD_RS, GPIO.OUT)
GPIO.setup(LCD_D4, GPIO.OUT)
GPIO.setup(LCD_D5, GPIO.OUT)
GPIO.setup(LCD_D6, GPIO.OUT)
GPIO.setup(LCD_D7, GPIO.OUT)

lcd_init()

while True:

lcd_string("LCD Testing",LCD_LINE_1)
lcd_string("ANCiT",LCD_LINE_2)
time.sleep(3)

lcd_string("All numbers 1234567890123456",LCD_LINE_1)
lcd_string("Alphabets aBcDeFgH",LCD_LINE_2)

def lcd_init():
lcd_byte(0x33,LCD_CMD)
lcd_byte(0x32,LCD_CMD)
lcd_byte(0x06,LCD_CMD)
lcd_byte(0x0C,LCD_CMD)
lcd_byte(0x28,LCD_CMD)
lcd_byte(0x01,LCD_CMD)
time.sleep(E_DELAY) def lcd_byte(bits, mode):
GPIO.output(LCD_RS, mode)
GPIO.output(LCD_D4,False)
GPIO.output(LCD_D5,False)
GPIO.output(LCD_D6,False)
GPIO.output(LCD_D7,False)
if bits&0x10==0x10:
GPIO.output(LCD_D4,True)
if bits&0x20==0x20:
GPIO.output(LCD_D5,True)
if bits&0x40==0x40:
GPIO.output(LCD_D6,True)
if bits&0x80==0x80:
GPIO.output(LCD_D7,True)

lcd_toggle_enable()

GPIO.output(LCD_D4,False)
GPIO.output(LCD_D5,False)
GPIO.output(LCD_D6,False)
GPIO.output(LCD_D7,False)
if bits&0x01==0x01:
GPIO.output(LCD_D4,True)
if bits&0x02==0x02:
GPIO.output(LCD_D5,True)
if bits&0x04==0x04:
GPIO.output(LCD_D6,True)
if bits&0x08==0x08:
GPIO.output(LCD_D7,True)

lcd_toggle_enable()

def lcd_toggle_enable():

time.sleep(E_DELAY)
GPIO.output(LCD_E,True)
time.sleep(E_PULSE)
GPIO.output(LCD_E,False)
time.sleep(E_DELAY)

def lcd_string(message,line):

message = message.ljust(LCD_WIDTH," ")

lcd_byte(line, LCD_CMD)

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

if __name__ == '__main__':

try:
main()
except KeyboardInterrupt:
pass
finally:
lcd_byte(0x01, LCD_CMD)
lcd_string("Goodbye!",LCD_LINE_1)
GPIO.cleanup()