89 lines
2.4 KiB
Python
89 lines
2.4 KiB
Python
import time,sys
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from grove_rgb_lcd import lcd
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if sys.platform == 'uwp':
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import winrt_smbus as smbus
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bus = smbus.SMBus(1)
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else:
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import smbus
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import RPi.GPIO as GPIO
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rev = GPIO.RPI_REVISION
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if rev == 2 or rev == 3:
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bus = smbus.SMBus(1)
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else:
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bus = smbus.SMBus(0)
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# this device has two I2C addresses
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DISPLAY_RGB_ADDR = 0x62
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DISPLAY_TEXT_ADDR = 0x3e
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# set backlight to (R,G,B) (values from 0..255 for each)
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def setRGB(r,g,b):
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bus.write_byte_data(DISPLAY_RGB_ADDR,0,0)
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bus.write_byte_data(DISPLAY_RGB_ADDR,1,0)
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bus.write_byte_data(DISPLAY_RGB_ADDR,0x08,0xaa)
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bus.write_byte_data(DISPLAY_RGB_ADDR,4,r)
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bus.write_byte_data(DISPLAY_RGB_ADDR,3,g)
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bus.write_byte_data(DISPLAY_RGB_ADDR,2,b)
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# send command to display (no need for external use)
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def textCommand(cmd):
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bus.write_byte_data(DISPLAY_TEXT_ADDR,0x80,cmd)
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# set display text \n for second line(or auto wrap)
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def setText(text):
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textCommand(0x01) # clear display
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time.sleep(.05)
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textCommand(0x08 | 0x04) # display on, no cursor
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textCommand(0x28) # 2 lines
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time.sleep(.05)
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count = 0
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row = 0
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for c in text:
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if c == '\n' or count == 16:
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count = 0
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row += 1
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if row == 2:
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break
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textCommand(0xc0)
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if c == '\n':
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continue
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count += 1
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bus.write_byte_data(DISPLAY_TEXT_ADDR,0x40,ord(c))
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#Update the display without erasing the display
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def setText_norefresh(text):
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textCommand(0x02) # return home
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time.sleep(.05)
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textCommand(0x08 | 0x04) # display on, no cursor
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textCommand(0x28) # 2 lines
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time.sleep(.05)
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count = 0
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row = 0
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while len(text) < 32: #clears the rest of the screen
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text += ' '
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for c in text:
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if c == '\n' or count == 16:
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count = 0
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row += 1
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if row == 2:
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break
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textCommand(0xc0)
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if c == '\n':
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continue
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count += 1
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bus.write_byte_data(DISPLAY_TEXT_ADDR,0x40,ord(c))
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# example code
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if __name__=="__main__":
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setRGB(255, 255, 255)
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# Total time in seconds
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total_seconds = 5 * 60
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while total_seconds >= 0:
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minutes = total_seconds // 60
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seconds = total_seconds % 60
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setText(f"{minutes:02d}:{seconds:02d}")
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time.sleep(1)
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total_seconds -= 1 |