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input.py
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# ------------------------------------------------------------------------
# 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 RPi.GPIO as GPIO
import time
import os.path
# Define GPIO to LCD mapping
LCD_RS = 17 #04
LCD_E = 22 #06
LCD_D4 = 5 #11
LCD_D5 = 6 #12
LCD_D6 = 13 #13
LCD_D7 = 19 #14
#RED and GREEN LEDs
RED = 21
GREEN = 16
# Define some device constants
LCD_WIDTH = 16 # 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
# Timing constants
E_PULSE = 0.00005
E_DELAY = 0.00005
# ========================================================================
def main():
# Variable that maintains optimum temperature level at 25 degrees fahrenheit called temp_constant
# Turn on GREEN led and turn off RED led
save_path = 'C:/example/' # Location of the dropbox
# Initialization of the LCD screen -----------------------------------
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(RED, GPIO.OUT) # Setup GPIO Pin to OUT
GPIO.output(RED, True) # Turn on GPIO
GPIO.setup(GREEN, GPIO.OUT) # Setup GPIO Pin to OUT
GPIO.output(GREEN, True) # Turn on GPIO
lcd_init() # Initialise display
# Test display code
lcd_byte(LCD_LINE_1, LCD_CMD)
lcd_string("Hi Joe")
lcd_byte(LCD_LINE_2, LCD_CMD)
lcd_string("Model B")
time.sleep(3) # 3 second delay
# More test display code
lcd_byte(LCD_LINE_1, LCD_CMD)
lcd_string("Hello World")
lcd_byte(LCD_LINE_2, LCD_CMD)
lcd_string(".co.uk")
time.sleep(20)
# --------------------------------------------------------------------
while True: # Loop the following continuously
# Read in values from each of the sensors
# UHHHHHHHHHH
# Convert each to a corresponding temperature
# If the temperature is below temp_constant
# Turn on RED led and turn off GREEN led
# Write data to a text file located in the dropbox
name_of_file = 'temperatures.txt'
completeName = os.path.join(save_path, name_of_file)
file1 = open(completeName, "w")
for i in range(0, len(temperature_input)):
file1.write(temperature_input[i], '\n')
file1.close()
# ------------------------------------------------------------------------
def lcd_init():
# Initialise display
lcd_byte(0x33,LCD_CMD) #0011 0011
lcd_byte(0x32,LCD_CMD) #0011 0010
lcd_byte(0x28,LCD_CMD) #0010 1000
lcd_byte(0x0C,LCD_CMD) #0000 1100
lcd_byte(0x06,LCD_CMD) #0000 0110
lcd_byte(0x01,LCD_CMD) #0000 0001
# ------------------------------------------------------------------------
def lcd_string(message):
# Send string to display
message = message.ljust(LCD_WIDTH," ")
for i in range(LCD_WIDTH):
lcd_byte(ord(message[i]),LCD_CHR)
# ------------------------------------------------------------------------
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
time.sleep(E_DELAY)
GPIO.output(LCD_E, True)
time.sleep(E_PULSE)
GPIO.output(LCD_E, False)
time.sleep(E_DELAY)
# 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
time.sleep(E_DELAY)
GPIO.output(LCD_E, True)
time.sleep(E_PULSE)
GPIO.output(LCD_E, False)
time.sleep(E_DELAY)
# ========================================================================
if __name__ == '__main__':
main()