Mar-03-2018, 09:44 AM
Hello Everyone,
I am new to coding and the Raspberry Pi, and I hope you can help me out?
I have a code to display to an LCD-I2C 20x4 display but I want (LCD_LINE_2) to scroll from Right to Left. This would be easy if I had just 1 line of the same text to display, but for each #Train I want a different set of "Calling At" stations so the text will change every time.
I have tried contacting the person who wrote he code but I have had no reply.
I am using Python3.x
Thank you for any and all help in this matter.
I am new to coding and the Raspberry Pi, and I hope you can help me out?
I have a code to display to an LCD-I2C 20x4 display but I want (LCD_LINE_2) to scroll from Right to Left. This would be easy if I had just 1 line of the same text to display, but for each #Train I want a different set of "Calling At" stations so the text will change every time.
I have tried contacting the person who wrote he code but I have had no reply.
I am using Python3.x
Thank you for any and all help in this matter.
#!/usr/bin/python #-------------------------------------- # ___ ___ _ ____ # / _ \/ _ \(_) __/__ __ __ # / , _/ ___/ /\ \/ _ \/ // / # /_/|_/_/ /_/___/ .__/\_, / # /_/ /___/ # # lcd_i2c.py # LCD test script using I2C backpack. # Supports 16x2 and 20x4 screens. # # Author : Matt Hawkins # Date : 20/09/2015 # # http://www.raspberrypi-spy.co.uk/ # # Copyright 2015 Matt Hawkins # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. # #-------------------------------------- import smbus import time # Define some device parameters I2C_ADDR = 0x27 # I2C device address LCD_WIDTH = 20 # 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 main(): # Main program block # Initialise display lcd_init() while True: # Train 1 lcd_string("1st Victoria Only",LCD_LINE_1) lcd_string("Calling At Victoria Only",LCD_LINE_2) lcd_string("2nd Orpington",LCD_LINE_3) lcd_string("3rd Wisbech ",LCD_LINE_4) time.sleep(180) # Train 2 lcd_string("1st Orpington",LCD_LINE_1) lcd_string("Calling At Bromley, Petts Wood, Bickley And Orpington",LCD_LINE_2) lcd_string("2nd Wisbech",LCD_LINE_3) lcd_string("3rd Victoria",LCD_LINE_4) time.sleep(180) # Train 3 lcd_string("1st Wisbech",LCD_LINE_1) lcd_string("Calling At Peterborough, Ely and Wisbech",LCD_LINE_2) lcd_string("2nd Victoria",LCD_LINE_3) lcd_string("3rd Orpington",LCD_LINE_4) time.sleep(180) if __name__ == '__main__': try: main() except KeyboardInterrupt: pass finally: lcd_byte(0x01, LCD_CMD)