# Libraries
from machine import Pin,PWM,SoftI2C
from hcsr04 import HCSR04
import time
from lcd1602 import LCD1602

# bin height 100cm
binHeight = 100

# setting pins
ultraSonic = HCSR04(trigger_pin = 2, echo_pin = 4)

LED = Pin(27, Pin.OUT)

buzzer = PWM(Pin(26), freq = 1, duty = 0)
buzzer.init(freq=2, duty=0)

servo = PWM(Pin(13),freq=50,duty=0)

pirPin = Pin(14,Pin.OUT)

i2c = SoftI2C(scl=Pin(22), sda=Pin(21), freq=400000)
lcd = LCD1602(i2c)

# servo Function
def Servo(servo, angle):
    servo.duty(int(((angle) / 180 * 2 + 0.5) / 20 * 1023))

# endless loop
while True:

    # PIR Sensor value
    pirVal = pirPin.value()

    # lid handler
    if (pirVal == 1):
        Servo(servo, 180)

    elif (pirVal != 1):
        Servo(servo, 20)

    # ultrasonic sensor distance
    distance = ultraSonic.distance_cm()

    binPer = (100 * distance) / binHeight
    binPer2 = int(101 - binPer) 
    # lcd.move(2,1)

    num_spaces = (16 - len(str(binPer2))) // 2
    padding = " " * num_spaces
    centered_text = padding + str(binPer2)+ "%" + padding

    lcd.clear()
    lcd.puts(centered_text)

    # waste measure
    if(distance < 6):
        LED.on()
        buzzer.init(freq=1047, duty=512)
        
    else:
        LED.off()
        buzzer.duty(0)

    time.sleep_ms(1000)