Intensitate_led_butoane_LCD

import RPi.GPIO as GPIO
import time
from RPLCD.i2c import CharLCD

i2c_addr = 0x27

lcd = CharLCD('PCF8574', i2c_addr, cols=16, rows=2)

GPIO.setmode(GPIO.BCM)

button_up =  17
button_down = 27
led = 22

GPIO.setup(button_up, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(button_down, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(led, GPIO.OUT)

pwm = GPIO.PWM(led, 30) #setez la frecv de 1000 Hz
pwm.start(0) # porneste pwm cu o intensitatea de la valoarea 0%

intensitate = 0

try:
        while True:
             if GPIO.input(button_up) == GPIO.LOW:
                          if intensitate < 100:
                                  intensitate += 20
                                  pwm.ChangeDutyCycle(intensitate)
                                  print(f"Intensitate LED crescuta: {intensitate}%")
                                  lcd.clear()
                                  lcd.write_string(f"Intensitate: {intensitate}%")
                                  time.sleep(0.1)
                                              
            if GPIO.input(button_down) == GPIO.LOW:
                          if intensitate > 0:
                                  intensitate -= 20
                                  pwm.ChangeDutyCycle(intensitate)
                                  print(f"Intensitate LED crescuta: {intensitate}%")
                                  lcd.clear()
                                  lcd.write_string(f"Intensitate: {intensitate}%")
                                  time.sleep(0.1)

except KeyboardInterrupt:
        pass

finally:
        pwm.stop()
        GPIO.cleanup() # reseteaza GPIO