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lcd.py
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lcd.py
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#!/usr/bin/python
#sudo apt install python-pip pip install gpiozero
#--------------------------------------
# The wiring for the LCD is as follows:
# 1 : GND
# 2 : 5V
# 3 : Contrast (0-5V)*
# 4 : RS (Register Select)
# 5 : R/W (Read Write) - GROUND THIS PIN
# 6 : Enable or Strobe
# 7 : Data Bit 0 - NOT USED
# 8 : Data Bit 1 - NOT USED
# 9 : Data Bit 2 - NOT USED
# 10: Data Bit 3 - NOT USED
# 11: Data Bit 4
# 12: Data Bit 5
# 13: Data Bit 6
# 14: Data Bit 7
# 15: LCD Backlight +5V**
# 16: LCD Backlight GND
#import
import os
import sys
import signal
import RPi.GPIO as GPIO
import time
from datetime import datetime
#from gpiozero import CPUTemperature
import socket
import struct
import re
import psutil as PSUTIL
import psutil
import psutil,os
import shutil
#GET_TEMP_CMD = "/opt/vc/bin/vcgencmd measure_temp"
GPIO.setwarnings(False)
# Define GPIO to LCD mapping
LCD_RS = 7
LCD_E = 8
LCD_D4 = 25
LCD_D5 = 24
LCD_D6 = 23
LCD_D7 = 18
LED_ON = 15
# Define some device constants
LCD_WIDTH = 20 # Maximum characters per line
LCD_CHR = True
LCD_CMD = False
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
# Timing constants
E_PULSE = 0.0005
E_DELAY = 0.0005
def main():
# Main program block
GPIO.setmode(GPIO.BCM) # Use BCM GPIO numbers
GPIO.setup(LCD_E, GPIO.OUT) # E
GPIO.setup(LCD_RS, GPIO.OUT) # RS
GPIO.setup(LCD_D4, GPIO.OUT) # DB4
GPIO.setup(LCD_D5, GPIO.OUT) # DB5
GPIO.setup(LCD_D6, GPIO.OUT) # DB6
GPIO.setup(LCD_D7, GPIO.OUT) # DB7
GPIO.setup(LED_ON, GPIO.OUT) # Backlight enable
# Initialise display
lcd_init()
# Toggle backlight on-off-on
lcd_backlight(True)
time.sleep(0.5)
lcd_backlight(False)
time.sleep(0.5)
lcd_backlight(True)
time.sleep(0.5)
while True:
# Send some centred test
# lcd_string("Pi 4 Server",LCD_LINE_2,2)
lcd_string(datetime.now().strftime('%a %d/%m/%y %H:%M'),LCD_LINE_1,2)
# lcd_string("motion",LCD_LINE_3,2)
# lcd_string("Motion2",LCD_LINE_4,2)
time.sleep(2) # 3 second delay
lcd_string("media %s" % mediaHDD(),LCD_LINE_2,2)
lcd_string("other %s" % otherHDD(),LCD_LINE_3,2)
lcd_string("temp: %s" % cpu_tempC() + "c " + "cpu: %s" % cpu(),LCD_LINE_4,2)
# lcd_string("cpu: %s " % cpu(),LCD_LINE_4,2)
# print(psutil.cpu_percent())
time.sleep(3) # 3 second delay
def gpio():
GPIO.output(27, True)
def cpu_tempC():
mytemp = ""
f = os.popen("/opt/vc/bin/vcgencmd measure_temp")
for i in f.readlines():
mytemp += i
mytemp = mytemp[5:-5]
return mytemp
def cpu():
return str(psutil.cpu_percent()) + '%'
def mediaHDD():
mediaHDD = psutil.disk_usage('/home/pi/media')
# Divide from Bytes -> KB -> MB -> GB
free = round(mediaHDD.free/1024.0/1024.0/1024.0,1)
total = round(mediaHDD.total/1024.0/1024.0/1024.0,1)
return str(free) + 'GB free'
def otherHDD():
otherHDD = psutil.disk_usage('/home/pi/other')
# Divide from Bytes -> KB -> MB -> GB
free = round(otherHDD.free/1024.0/1024.0/1024.0,1)
total = round(otherHDD.total/1024.0/1024.0/1024.0,1)
return str(free) + 'GB free'
#def net_io():
# net_io = psutil.net_io_counters()
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 = data
# mode = True for character
# False for command
GPIO.output(LCD_RS, mode) # RS
# High bits
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)
# Toggle 'Enable' pin
lcd_toggle_enable()
# Low bits
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)
# Toggle 'Enable' pin
lcd_toggle_enable()
def lcd_toggle_enable():
# 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,style):
# Send string to display
# style=1 Left justified
# style=2 Centred
# style=3 Right justified
if style==1:
message = message.ljust(LCD_WIDTH," ")
elif style==2:
message = message.center(LCD_WIDTH," ")
elif style==3:
message = message.rjust(LCD_WIDTH," ")
lcd_byte(line, LCD_CMD)
for i in range(LCD_WIDTH):
lcd_byte(ord(message[i]),LCD_CHR)
def lcd_backlight(flag):
# Toggle backlight on-off-on
GPIO.output(LED_ON, flag)
if __name__ == '__main__':
try:
main()
except KeyboardInterrupt:
pass
finally:
lcd_byte(0x01, LCD_CMD)
lcd_string("Goodbye!",LCD_LINE_1,2)
GPIO.cleanup()