Konfigurasi LCD+I2C di Raspberry PI

Buka terminal lalu  masukkan perintah sudo raspi-config

1. Pilih Interfaces Options
2. Pilih I2C
3. Pilih Select 
4. Finish
5. sudo apt-get install i2c-tools
6. sudo apt-get install python-smbus
7. sudo reboot

coding pythonnya :

import smbus

from time import *

# LCD Address

ADDRESS = 0x27

# commands

LCD_CLEARDISPLAY = 0x01

LCD_RETURNHOME = 0x02

LCD_ENTRYMODESET = 0x04

LCD_DISPLAYCONTROL = 0x08

LCD_CURSORSHIFT = 0x10

LCD_FUNCTIONSET = 0x20

LCD_SETCGRAMADDR = 0x40

LCD_SETDDRAMADDR = 0x80

# flags for display entry mode

LCD_ENTRYRIGHT = 0x00

LCD_ENTRYLEFT = 0x02

LCD_ENTRYSHIFTINCREMENT = 0x01

LCD_ENTRYSHIFTDECREMENT = 0x00

# flags for display on/off control

LCD_DISPLAYON = 0x04

LCD_DISPLAYOFF = 0x00

LCD_CURSORON = 0x02

LCD_CURSOROFF = 0x00

LCD_BLINKON = 0x01

LCD_BLINKOFF = 0x00

# flags for display/cursor shift

LCD_DISPLAYMOVE = 0x08

LCD_CURSORMOVE = 0x00

LCD_MOVERIGHT = 0x04

LCD_MOVELEFT = 0x00

# flags for function set

LCD_8BITMODE = 0x10

LCD_4BITMODE = 0x00

LCD_2LINE = 0x08

LCD_1LINE = 0x00

LCD_5x10DOTS = 0x04

LCD_5x8DOTS = 0x00

# flags for backlight control

LCD_BACKLIGHT = 0x08

LCD_NOBACKLIGHT = 0x00

En = 0b00000100 # Enable bit

Rw = 0b00000010 # Read/Write bit

Rs = 0b00000001 # Register select bit

class i2c_device:

   def __init__(self, addr, port=1):

      self.addr = addr

      self.bus = smbus.SMBus(port)

# Write a single command

   def write_cmd(self, cmd):

      self.bus.write_byte(self.addr, cmd)

      sleep(0.0001)

class lcd:

   #initializes objects and lcd

   def __init__(self):

      self.lcd_device = i2c_device(ADDRESS)

      self.lcd_write(0x03)

      self.lcd_write(0x03)

      self.lcd_write(0x03)

      self.lcd_write(0x02)

      self.lcd_write(LCD_FUNCTIONSET | LCD_2LINE | LCD_5x8DOTS | LCD_4BITMODE)

      self.lcd_write(LCD_DISPLAYCONTROL | LCD_DISPLAYON)

      self.lcd_write(LCD_CLEARDISPLAY)

      self.lcd_write(LCD_ENTRYMODESET | LCD_ENTRYLEFT)

      sleep(0.2)

   # clocks EN to latch command

   def lcd_strobe(self, data):

      self.lcd_device.write_cmd(data | En | LCD_BACKLIGHT)

      sleep(.0005)

      self.lcd_device.write_cmd(((data & ~En) | LCD_BACKLIGHT))

      sleep(.0001)

   def lcd_write_four_bits(self, data):

      self.lcd_device.write_cmd(data | LCD_BACKLIGHT)

      self.lcd_strobe(data)

   # write a command to lcd

   def lcd_write(self, cmd, mode=0):

      self.lcd_write_four_bits(mode | (cmd & 0xF0))

      self.lcd_write_four_bits(mode | ((cmd << 4) & 0xF0))

   # put string function

   def lcd_display_string(self, string, line):

      if line == 1:

         self.lcd_write(0x80)

      if line == 2:

         self.lcd_write(0xC0)

      if line == 3:

         self.lcd_write(0x94)

      if line == 4:

         self.lcd_write(0xD4)

      for char in string:

         self.lcd_write(ord(char), Rs)

   # clear lcd and set to home

   def lcd_clear(self):

      self.lcd_write(LCD_CLEARDISPLAY)

      self.lcd_write(LCD_RETURNHOME)

display = lcd()

display.lcd_display_string("   MONITORING   ", 1)

display.lcd_display_string("SUHU &KELEMBABAN", 2)