print("This program will integrate ESP32 with ultrasonic sensor")

#Import nexcessary module/libraries
import hcsr04 #ultrasonic library
import ssd1306 #oled library
from utime import sleep
from machine import SoftI2C,Pin ,PWM #PWM= Pulse Witdh MOde

#Create an object called ultrasomic_sensor using OOP (Object Oriented Programming)
#OOP format is --> library name.class name (......)
ultrasonic_sensor=hcsr04.HCSR04(trigger_pin=13, echo_pin=27, echo_timeout_us=500*2*30)

#2.Declare pin on LED Display
i2c_oled = SoftI2C(scl=Pin(22), sda=Pin(21))
oled_width = 128 #based on spec
oled_height = 64 #based on spec

#4.Create an object called "oled"
#Remark: object format "library name.class name"
oled = ssd1306.SSD1306_I2C(oled_width, oled_height, i2c_oled)

#Declare buzzer connection
buzzer=PWM(Pin(23),Pin.OUT)

while True:

    #Let's test our ultrasonic sensor
    jarak_in_cm = ultrasonic_sensor.distance_cm()#use when u need decimal point number
    jarak_in_mm = ultrasonic_sensor.distance_mm()#use when u want whole number

    #Display the distance vaalues on Serial Monitor
    print('An object is detected in :', jarak_in_cm, 'cm')
    print('An object is detected in :', jarak_in_mm, 'mm')
    print('---------------------------------------------')
    print('\n')

    #Display distance value on OLED screen
    oled.fill(0)#To make screen becoming white
    oled.text('Object Detected', 0, 0, 1) #1st 0 is X-axis,2nd 0 is Y-axis,3rd is colour display
    oled.text(str(jarak_in_cm), 0, 20, 1)
    oled.text('cm',70, 20, 1)
    oled.text(str(jarak_in_mm), 0, 40, 1)
    oled.text('mm',40, 40, 1)
    oled.show()

    if jarak_in_cm <50:
        for i in  range(10):
            buzzer.init(freq=1669,duty=512)
            sleep(0.5)
            buzzer.init(freq=1,duty=0)
            sleep(0.5)
    elif 50 <= jarak_in_cm<150:
        for i in  range(10):
            buzzer.init(freq=1669,duty=512)
            sleep(0.5)
            buzzer.init(freq=1,duty=0)
            sleep(0.5)
    else:
        buzzer.init(freq=1,duty=0)

    sleep(5)