User manual

Ausgabe 10.11.2017 Copyright by Joy-IT 6

import time

import RPi.GPIO as GPIO

# PIN-Configuration

LCD_RS = 7 #GPIO7 = Pi pin 26

LCD_E = 8 #GPIO8 = Pi pin 24

LCD_D4 = 17 #GPIO17 = Pi pin 11

LCD_D5 = 18 #GPIO18 = Pi pin 12

LCD_D6 = 27 #GPIO21 = Pi pin 13

LCD_D7 = 22 #GPIO22 = Pi pin 15

OUTPUTS = [LCD_RS,LCD_E,LCD_D4,LCD_D5,LCD_D6,LCD_D7]

#Button-PINs

SW1 = 4 #GPIO4 = Pi pin 7

SW2 = 23 #GPIO16 = Pi pin 16

SW3 = 10 #GPIO10 = Pi pin 19

SW4 = 9 #GPIO9 = Pi pin 21

INPUTS = [SW1,SW2,SW3,SW4]

#HD44780 Controller Commands

CLEARDISPLAY = 0x01

SETCURSOR = 0x80

#Line Addresses. (Pick one. Comment out whichever doesn't apply)

LINE = [0x00,0x40,0x14,0x54] #for 20x4 display

#LINE = [0x00,0x40] #for 16x2 display

########################################################################

def InitIO():

#Sets GPIO pins to input & output, as required by LCD board

GPIO.setmode(GPIO.BCM)

GPIO.setwarnings(False)

for lcdLine in OUTPUTS:

GPIO.setup(lcdLine, GPIO.OUT)

for switch in INPUTS:

GPIO.setup(switch, GPIO.IN, pull_up_down=GPIO.PUD_UP)

def CheckSwitches():

#Check status of all four switches on the LCD board

val1 = not GPIO.input(SW1)

val2 = not GPIO.input(SW2)

val3 = not GPIO.input(SW3)

val4 = not GPIO.input(SW4)

return (val4,val1,val2,val3)

LCD Display 20x4 mit Buttons