#import libraries/modulestance Sensor
Distance: 
$0
from machine import Pin, PWM, ADC, SoftI2C
import ultrasonic_library
import oled_library
from utime import sleep

#Pin Declaration
trig_pin = Pin(25, Pin.IN)
echo_pin = Pin(26, Pin.IN)
buzzer_pin = PWM(Pin(23, Pin.OUT))
red_led = Pin(19, Pin.OUT)
green_led = Pin(5, Pin.OUT)
yellow_led = Pin(18, Pin.OUT)
pir_pin = Pin(13, Pin.IN)
servo = PWM(Pin(17), freq = 50)
mq2_pin = ADC(Pin(34))
mq2_pin.atten(ADC.ATTN_11DB)  # Full range 0-3.3V
plastic_led = Pin(4, Pin.OUT)
organic_led = Pin(0, Pin.OUT)
landfill_led = Pin(16, Pin.OUT)
SCL_Pin = Pin(22, Pin.OUT)
SDA_Pin = Pin(21, Pin.OUT)
OLED_Pin = SoftI2C(scl = SCL_Pin, sda = SDA_Pin)

#Parameter Declaration
count_people = 0

#Object Declaration
#Object_name = library_name.class_name(......)
fill_level = ultrasonic_library.HCSR04(trigger_pin = trig_pin, echo_pin = echo_pin, echo_timeout_us=500*2*30)
screen = oled_library.SSD1306_I2C( width = 128 , height = 64, i2c = OLED_Pin)

#main program
def set_servo_angle(angle):
    duty = int(((angle / 180) * 2 + 0.5) / 20 * 1023)
    servo.duty(duty)

while True:
    measure_filllevel = fill_level.distance_cm() #output is in number
    print("The Bin Fill Level is", measure_filllevel, "cm")

    motion_status = pir_pin.value()

    gas_value = mq2_pin.read()
    print("Gas value:", gas_value)

    # Reset LEDs
    plastic_led.off()
    landfill_led.off()
    organic_led.off()


    #condition to check the bin level fill
    if measure_filllevel < 40:
        green_led.on()
        buzzer_pin.init(freq = 800 , duty = 0)

        #display screen for users
        screen.fill(0)
        screen.text("Bin Fill Level: ", 3, 0, 1)
        screen.text(str(measure_filllevel), 10, 10, 1)
        screen.text("cm", 80, 10, 1)
        screen.text("Bin is empty", 3,20,1)
        screen.show()

    elif 40 < measure_filllevel <= 100:
        green_led.off()
        red_led.off()
        yellow_led.on()
        sleep(0.1)
        yellow_led.off()
        buzzer_pin.init(freq = 800 , duty = 0)
        sleep(0.1)

        #display screen for users
        screen.fill(0)
        screen.text("Bin Fill Level: ", 3, 0, 1)
        screen.text(str(measure_filllevel), 10, 10, 1)
        screen.text("cm", 80, 10, 1)
        screen.text("Bin is Med Full", 3,20,1)
        screen.show()
    else:
        red_led.on()
        buzzer_pin.init(freq = 2500 , duty = 512)
        sleep(0.1)
        buzzer_pin.init(freq = 2500 , duty = 0)
        sleep(0.1)

        #display screen for users
        screen.fill(0)
        screen.text("Bin Fill Level: ", 3, 0, 1)
        screen.text(str(measure_filllevel), 10, 10, 1)
        screen.text("cm", 80, 10, 1)
        screen.text("Bin is Full", 3,20,1)
        screen.show()
    
    #condition to check motion to open the bin
    if motion_status == 1:   #means object detected
        set_servo_angle(90)  # Rotate servo to 90 degrees
        sleep(2)             
        set_servo_angle(0) 
        red_led.on()
        sleep(0.2)
        red_led.off()
        sleep(0.2)
        count_people = count_people + 1
        print("Frequency of object detected -->", count_people)
    else:
        set_servo_angle(90)   # Stay at rest
        sleep(0.2)               
        red_led.off()
    
    #condition to check type of waste 
    if gas_value < 1500:
        organic_led.off()
        landfill_led.off()
        plastic_led.on()
        print("Plastic Waste")

        screen.fill(0)
        screen.text("Type of Waste: ", 3, 0, 1)
        screen.text("Plastic waste", 3,30,1)
        screen.show()

    elif 1500 <= gas_value < 3000:
        organic_led.off()
        plastic_led.off()
        landfill_led.on()
        print("Landfill Waste")

        screen.fill(0)
        screen.text("Type of Waste: ", 3, 0, 1)
        screen.text("Landfill waste", 3,30,1)
        screen.show()
        
    elif 3000 <= gas_value < 4000:
        organic_led.on()
        landfill_led.off()
        plastic_led.off()
        print("Organic waste")

        screen.fill(0)
        screen.text("Type of Waste: ", 3, 0, 1)
        screen.text("Organic waste", 3,30,1)
        screen.show()
    
    
    else: 
        buzzer_pin.init(freq = 2500 , duty = 512)
        sleep(0.1)
        buzzer_pin.init(freq = 2500 , duty = 0)
        sleep(0.1)
        print("Unknown Waste Detected!")

        screen.fill(0)
        screen.text("Type of Waste: ", 3, 0, 1)
        screen.text("Unknown waste", 3,30,1)
        screen.show()

        
    sleep(1)