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--- raspberrypi:wiringpi:lcd [2017/01/27 20:21] – created aistis
+++ raspberrypi:wiringpi:lcd [2017/01/30 11:59] (current) – aistis
@@ Line 1: / Line 1: @@
+Kaip prijungti ekrana 1602A prie raspberry pi
+{{:raspberrypi:wiringpi:pasted:20170127-202310.png}}
 http://kurup87.blogspot.lt/2014/09/16x2-lcd-hello-world-using-c-wiringpi.html
+{{:raspberrypi:wiringpi:pasted:20170127-202208.png}}
+kodas is interneto kuris suveike:
+<code python>
+#!/usr/bin/python
+#--------------------------------------
+#    ___  ___  _ ____
+#   / _ \/ _ \(_) __/__  __ __
+#  / , _/ ___/ /\ \/ _ \/ // /
+# /_/|_/_/  /_/___/ .__/\_, /
+#                /_/   /___/
+#
+#  lcd_16x2.py
+#  16x2 LCD Test Script
+#
+# Author : Matt Hawkins
+# Date   : 06/04/2015
+#
+# http://www.raspberrypi-spy.co.uk/
+#
+#--------------------------------------
+# 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
+# Define GPIO to LCD mapping
+LCD_RS = 7
+LCD_E  = 8
+LCD_D4 = 25
+LCD_D5 = 24
+LCD_D6 = 23
+LCD_D7 = 18
+# 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 = 0.0005
+E_DELAY = 0.0005
+def main():
+  # Main program block
+  GPIO.setwarnings(False)
+  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()
+  while True:
+    # Send some test
+    lcd_string("Labas Petrai",LCD_LINE_1)
+    lcd_string("Labas Nojau",LCD_LINE_2)
+    time.sleep(3) # 3 second delay
+    # Send some text
+    lcd_string("Labas Mariau",LCD_LINE_1)
+    lcd_string("Labas Aisti",LCD_LINE_2)
+    time.sleep(3)
+    # Send some text
+    lcd_string("wiki.coderdojo.lt",LCD_LINE_1)
+    lcd_string("Raspberry Pi 3",LCD_LINE_2)
+    time.sleep(3)
+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):
+  # Send string to display
+  message = message.ljust(LCD_WIDTH," ")
+  lcd_byte(line, LCD_CMD)
+  for i in range(LCD_WIDTH):
+    lcd_byte(ord(message[i]),LCD_CHR)
+if __name__ == '__main__':
+  try:
+    main()
+  except KeyboardInterrupt:
+    pass
+  finally:
+    lcd_byte(0x01, LCD_CMD)
+    lcd_string("Goodbye!",LCD_LINE_1)
+    GPIO.cleanup()
+</code>