python_lcd/lcd/i2c_micropython_lcd_test.py at 5477015f074e176c9c916c9c0c5b42e88f094ba0 · dhylands/python_lcd · GitHub

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"""Implements a HD44780 character LCD connected via PCF8574 on I2C."""

from i2c_micropython_lcd import I2cLcd
import machine
import time

# The PCF8574 has a jumper selectable address: 0x20 - 0x27
DEFAULT_I2C_ADDR = 0x27

def test_main():
    """Test function for verifying basic functionality."""
    sda = machine.Pin(18)
    scl = machine.Pin(19)
    i2c = machine.I2C(scl=scl, sda=sda, freq=100000)

    lcd = I2cLcd(i2c, DEFAULT_I2C_ADDR, 4, 20)
    lcd.blink_cursor_on()
    lcd.putstr("It Works!\nSecond Line")
    time.sleep(3)
    lcd.clear()

    # custom characters: battery icons - 5 wide, 8 tall
    lcd.custom_char(0, bytearray([0x0E,0x1B,0x11,0x11,0x11,0x11,0x11,0x1F]))  # 0% Empty
    lcd.custom_char(1, bytearray([0x0E,0x1B,0x11,0x11,0x11,0x11,0x1F,0x1F]))  # 16%
    lcd.custom_char(2, bytearray([0x0E,0x1B,0x11,0x11,0x11,0x1F,0x1F,0x1F]))  # 33%
    lcd.custom_char(3, bytearray([0x0E,0x1B,0x11,0x11,0x1F,0x1F,0x1F,0x1F]))  # 50%
    lcd.custom_char(4, bytearray([0x0E,0x1B,0x11,0x1F,0x1F,0x1F,0x1F,0x1F]))  # 66%
    lcd.custom_char(5, bytearray([0x0E,0x1B,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F]))  # 83%
    lcd.custom_char(6, bytearray([0x0E,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F,0x1F]))  # 100% Full
    lcd.custom_char(7, bytearray([0x0E,0x1F,0x1B,0x1B,0x1B,0x1F,0x1B,0x1F]))  # ! Error
    for i in range(8):
        lcd.putchar(chr(i))
    time.sleep(3)
    lcd.clear()
    lcd.blink_cursor_off()

    count = 0
    while True:
        lcd.move_to(0, 0)
        lcd.putstr("Time: " + str(time.time()))
        time.sleep(1)
        count += 1
        if count % 10 == 3:
            print("Turning backlight off")
            lcd.backlight_off()
        if count % 10 == 4:
            print("Turning backlight on")
            lcd.backlight_on()
        if count % 10 == 5:
            print("Turning display off")
            lcd.display_off()
        if count % 10 == 6:
            print("Turning display on")
            lcd.display_on()
        if count % 10 == 7:
            print("Turning display & backlight off")
            lcd.backlight_off()
            lcd.display_off()
        if count % 10 == 8:
            print("Turning display & backlight on")
            lcd.backlight_on()
            lcd.display_on()

if __name__ == "__main__":
    test_main()