Circuit Python Example ST7735 LCD backlight fading

code.py

import board
import time
import pwmio

print("Hello world!")

class LCD:
    _led = None
    _led_max = 65535
    @property
    def led(self):
        if self._led is None:
            self._led = pwmio.PWMOut(board.GP25, frequency=1000, duty_cycle=65536)
        return self._led

    def backlight(self, value):
        """Set backlight brightness in percent"""
        new_value = min((self._led_max * value // 100, self._led_max))
        self.led.duty_cycle = new_value

def main():
    lcd = LCD()
    while True:
        for i in range(101):
            lcd.backlight(i)
            time.sleep(0.01)
        for i in range(100, 0, -1):
            lcd.backlight(i)
            time.sleep(0.01)


if __name__ == '__main__':
    main()