# -*- coding: utf-8 -*-
# Original code found at:
# https://gist.github.com/DenisFromHR/cc863375a6e19dce359d
"""
Compiled, mashed and generally mutilated 2014-2015 by Denis Pleic
Made available under GNU GENERAL PUBLIC LICENSE
# Modified Python I2C library for Raspberry Pi
# as found on http://www.recantha.co.uk/blog/?p=4849
# Joined existing 'i2c_lib.py' and 'lcddriver.py' into a single library
# added bits and pieces from various sources
# By DenisFromHR (Denis Pleic)
# 2015-02-10, ver 0.1
"""
# i2c bus (0 -- original Pi, 1 -- Rev 2 Pi)
I2CBUS = 1
# LCD Address
ADDRESS = 0x3f
import smbus
from time import sleep
class i2c_device:
def __init__(self, addr, port=I2CBUS):
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)
# Write a command and argument
def write_cmd_arg(self, cmd, data):
self.bus.write_byte_data(self.addr, cmd, data)
sleep(0.0001)
# Write a block of data
def write_block_data(self, cmd, data):
self.bus.write_block_data(self.addr, cmd, data)
sleep(0.0001)
# Read a single byte
def read(self):
return self.bus.read_byte(self.addr)
# Read
def read_data(self, cmd):
return self.bus.read_byte_data(self.addr, cmd)
# Read a block of data
def read_block_data(self, cmd):
return self.bus.read_block_data(self.addr, cmd)
# 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 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))
# write a character to lcd (or character rom) 0x09: backlight | RS=DR<
# works!
def lcd_write_char(self, charvalue, mode=1):
self.lcd_write_four_bits(mode | (charvalue & 0xF0))
self.lcd_write_four_bits(mode | ((charvalue << 4) & 0xF0))
# put string function with optional char positioning
def lcd_display_string(self, string, line=1, pos=0):
if line == 1:
pos_new = pos
elif line == 2:
pos_new = 0x40 + pos
elif line == 3:
pos_new = 0x14 + pos
elif line == 4:
pos_new = 0x54 + pos
self.lcd_write(0x80 + pos_new)
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)
# define backlight on/off (lcd.backlight(1); off= lcd.backlight(0)
def backlight(self, state): # for state, 1 = on, 0 = off
if state == 1:
self.lcd_device.write_cmd(LCD_BACKLIGHT)
elif state == 0:
self.lcd_device.write_cmd(LCD_NOBACKLIGHT)
# add custom characters (0 - 7)
def lcd_load_custom_chars(self, fontdata):
self.lcd_write(0x40);
for char in fontdata:
for line in char:
self.lcd_write_char(line)
- lcd_text.py 파일 생성
import I2C_LCD_driver
from time import *
mylcd = I2C_LCD_driver.lcd()
mylcd.lcd_display_string("Hello World!", 1)
("Hello World!", 1, 2)로 바꾸면 글자 위치 바뀜 1=>행(1~2) 2=> 위치(1~3)
->lcd에 Hello World! 출력됨
- 날짜/시간 출력
import I2C_LCD_driver
import time
mylcd = I2C_LCD_driver.lcd()
while True:
mylcd.lcd_display_string("Time: %s" %time.strftime("%H:%M:%S"), 1)
mylcd.lcd_display_string("Date: %s" %time.strftime("%m/%d/%Y"), 2)
-온습도 센서 + lcd
import RPi.GPIO as GPIO
import time
import Adafruit_DHT
import I2C_LCD_driver
from time import *
sensor = Adafruit_DHT.DHT11
pin = 4
try:
while True:
h,t = Adafruit_DHT.read_retry(sensor,pin)
mylcd = I2C_LCD_driver.lcd()
if h is not None and t is not None:
print("Temperate={0:0.1f}*C Humidity={1:0.1f}%".format(t,h))
mylcd.lcd_display_string("Temperate={0:0.1f}*C".format(t),1)
mylcd.lcd_display_string("Humidity={0:0.1f}%".format(h),2)
else:
print("Read error")
except KeyboardInterrupt:
print("bye")
finally:
print("End of Program")
- 온습도 센서+ led추가+ lcd
import RPi.GPIO as GPIO
import time
import Adafruit_DHT
import I2C_LCD_driver
from time import *
GPIO.setmode(GPIO.BCM)
sensor = Adafruit_DHT.DHT11
pin = 4
LED_R= 13
LED_G= 19
LED_B= 26
GPIO.setup(LED_R, GPIO.OUT)
GPIO.setup(LED_G, GPIO.OUT)
GPIO.setup(LED_B, GPIO.OUT)
try:
while True:
h,t = Adafruit_DHT.read_retry(sensor,pin)
mylcd = I2C_LCD_driver.lcd()
if h is not None and t is not None:
if t > 27:
GPIO.output(LED_R, True)
GPIO.output(LED_G, False)
GPIO.output(LED_B, False)
print("Temperate={0:0.1f}*C Humidity={1:0.1f}%".format(t,h))
mylcd.lcd_display_string("Temperate={0:0.1f}*C".format(t),1)
mylcd.lcd_display_string("Humidity={0:0.1f}%".format(h),2)
elif t < 10:
GPIO.output(LED_R, False)
GPIO.output(LED_G, False)
GPIO.output(LED_B, True)
print("Temperate={0:0.1f}*C Humidity={1:0.1f}%".format(t,h))
mylcd.lcd_display_string("Temperate={0:0.1f}*C".format(t),1)
mylcd.lcd_display_string("Humidity={0:0.1f}%".format(h),2)
elif t >10 and t < 27:
GPIO.output(LED_R, False)
GPIO.output(LED_G, True)
GPIO.output(LED_B, False)
print("Temperate={0:0.1f}*C Humidity={1:0.1f}%".format(t,h))
mylcd.lcd_display_string("Temperate={0:0.1f}*C".format(t),1)
mylcd.lcd_display_string("Humidity={0:0.1f}%".format(h),2)
else:
print("Read error")
except KeyboardInterrupt:
GPIO.output(LED_R, False)
GPIO.output(LED_G, False)
GPIO.output(LED_B, False)
print("bye")
finally:
print("End of Program")
git clone https://github.com/adafruit/Adafruit_Python_DHT.git
cd Adafruit_Python_DHT
sudo python setup.py install
-코드 입력 (gpio_tem.py 파일)
import time
import Adafruit_DHT
sensor = Adafruit_DHT.DHT11
pin = 4
try:
while True :
h, t = Adafruit_DHT.read_retry(sensor, pin) # h,t-> 습도, 온도/ 순서 바뀌면 값도 바뀜
if h is not None and t is not None :
print("Temperature = {0:0.1f}*C Humidity = {1:0.1f}%".format(t, h))
else :
print('Read error')
time.sleep(1)
except KeyboardInterrupt:
print("Terminated by Keyboard")
finally:
print("End of Program")
