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Copy pathQC1602A.py
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QC1602A.py
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#!/usr/bin/python
# LCD Screen - QC1602A V2.0
# THIS IS STILL IN DEVELOPMENT
# AND PROBABLY WONT BE USED ON THIS PROJECT
# THIS FILE HERE IS JUST FOR REFERENCE
# import
import RPi.GPIO as GPIO
import time
# Define GPIO to LCD mapping
LCD_RS = 7
LCD_E = 0x08
LCD_D4 = 25
LCD_D5 = 24
LCD_D6 = 23
LCD_D7 = 18
# Define some device constants
LCD_WIDTH = 0x10 # 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 message(msg1,msg2):
lcd_byte(LCD_LINE_1, LCD_CMD)
lcd_string(msg1)
lcd_byte(LCD_LINE_2, LCD_CMD)
lcd_string(msg2)
msg_txt1 = "Raspberry Pi"
msg_txt2 = "LCD Test"
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
# Initialise display
lcd_init()
# Send some test
message(msg_txt1,msg_txt2)
time.sleep(3) # 3 second delay
def lcd_init():
# Initialise display
lcd_byte(0x33, LCD_CMD)
lcd_byte(0x32, LCD_CMD)
lcd_byte(0x28, LCD_CMD)
lcd_byte(0x0C, LCD_CMD)
lcd_byte(0x06, LCD_CMD)
lcd_byte(0x01, LCD_CMD)
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()
while True:
message(msg_txt1,msg_txt2)
time.sleep(3)