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Rasp-Hack-Afficheur-LCD-Python (voir la source)
Version du 31 décembre 2016 à 10:44
, 31 décembre 2016 à 10:44→L'exemple Horloge + IP
That's all there is to using the '''Adafruit_CharLCD''' class!
That's all there is to using the '''Adafruit_CharLCD''' class!
== Avec un LCD RGB ==
If you're using an RGB backlight LCD the '''char_lcd_rgb.py''' script will demonstrate the usage.
If you're using a Raspberry Pi and have wired it according to this guide, you can immediately run the script. However if you're using a BeagleBone Black or have changed the wiring, edit the script with a text editor and uncomment/change the lines at the top that define the LCD pins.
To execute the RGB backlight example run this command from inside the '''examples''' directory:
sudo python char_lcd_rgb.py
You should see the LCD turn on and display different backlight colors. For example:
{{ADFImage|Rasp-Hack-Afficheur-LCD-Python-a10.jpg}}
If you open the file '''char_lcd_rgb.py''' in a text editor (such as nano) I'll describe the important differences between it and the previous '''char_lcd.py''' example below.
<syntaxhighlight lang="python">
# Example Raspberry Pi configuration:
lcd_rs = 27 # Change this to pin 21 on older revision Raspberry Pi's
lcd_en = 22
lcd_d4 = 25
lcd_d5 = 24
lcd_d6 = 23
lcd_d7 = 18
lcd_red = 4
lcd_green = 17
lcd_blue = 7 # Pin 7 is CE1
# Example BeagleBone Black configuration:
# lcd_rs = 'P8_8'
# lcd_en = 'P8_10'
# lcd_d4 = 'P8_18'
# lcd_d5 = 'P8_16'
# lcd_d6 = 'P8_14'
# lcd_d7 = 'P8_12'
# lcd_red = 'P8_7'
# lcd_green = 'P8_9'
# lcd_blue = 'P8_11'
</syntaxhighlight>
The first important difference is the configuration of LCD pins. Notice there are now explicit pins defined for the red, green, and blue backlight LEDs.
<syntaxhighlight lang="python">
# Initialize the LCD using the pins
lcd = LCD.Adafruit_RGBCharLCD(lcd_rs, lcd_en, lcd_d4, lcd_d5, lcd_d6, lcd_d7,
lcd_columns, lcd_rows, lcd_red, lcd_green, lcd_blue)
</syntaxhighlight>
The next line creates an instance of the '''Adafruit_RGBCharLCD''' class using the pin configuration defined earlier.
The '''Adafruit_RGBCharLCD''' class inherits from the '''Adafruit_CharLCD''' class so it has all the same functionality as demonstrated in the '''char_lcd.py''' example. In addition to the basic character LCD functionality the RGB character LCD class adds some functions to set the RGB color of the backlight.
<syntaxhighlight lang="python">
# Show some basic colors.
lcd.set_color(1.0, 0.0, 0.0)
lcd.clear()
lcd.message('RED')
time.sleep(3.0)
lcd.set_color(0.0, 1.0, 0.0)
lcd.clear()
lcd.message('GREEN')
time.sleep(3.0)
lcd.set_color(0.0, 0.0, 1.0)
lcd.clear()
lcd.message('BLUE')
time.sleep(3.0)
lcd.set_color(1.0, 1.0, 0.0)
lcd.clear()
lcd.message('YELLOW')
time.sleep(3.0)
lcd.set_color(0.0, 1.0, 1.0)
lcd.clear()
lcd.message('CYAN')
time.sleep(3.0)
lcd.set_color(1.0, 0.0, 1.0)
lcd.clear()
lcd.message('MAGENTA')
time.sleep(3.0)
lcd.set_color(1.0, 1.0, 1.0)
lcd.clear()
lcd.message('WHITE')
time.sleep(3.0)
</syntaxhighlight>
The code above demonstrates each basic color by calling the {{fname|set_color}} function and passing in which red, green, and blue LEDs to enable. For example the first call to {{fname|set_color(1.0, 0.0, 0.0)}} will turn on the '''red''' LED and turn off the green and blue LED so the backlight will have a '''red''' color.
Notice how later lines combine multiple LEDs to get different colors, like calling {{fname|set_color(1.0, 0.0, 1.0)}} to combine '''red''' and '''blue''' LEDs for a '''magenta/violet''' color.
== L'exemple Horloge + IP ==
== L'exemple Horloge + IP ==