print("THIS PROJECT FOR REVERSE CAR SYSTEM THAT INTEGRATE BETWEEN ESP32, ULTRASONIC SENSOR, OLED AND BUZZER")

# import library ultra sonic,oled,pwm,time

import hcsr04 #ultrasonis sensor
import ssd1306 # import oled library
from machine import SoftI2C,Pin,PWM, # pmw = Pulse Width Modulation
from time import sleep


#step 2 : DECLARE CONNECTION PIN USING OOP
#       : FOR ULTRASONIC SENSOR

ultrasonic_sensor=hcsr04.HCSR04(trigger_pin=5,echo_pin=18,echo_timeout_us=500*2*30) #500 is speed of sound in micro second, 2 is factor use because ultrasonic sensor, 30 safety

#STEP 2 = OLED 

i2c_oleddisplay = SoftI2C(scl=Pin(19), sda=Pin(21))

oled_width=128
oled_height=64
oled=ssd1306.SSD1306_I2C(oled_width,oled_height,i2c_oleddisplay)

#STEP 2 = BUZZER USING OOP

buzzer=PWM(Pin(17),Pin.OUT)

led = Pin(27,Pin.OUT)
led2 = Pin(25,Pin.OUT)
SW1 = Pin(2,Pin.IN)

#LED AND LED




#STEP 3 PROSES

while True:
  #for ultrasonic sensor on terminal
  distance_in_cm = ultrasonic_sensor.distance_cm() 
  distance_in_mm = ultrasonic_sensor.distance_mm()

  print('An object is detected in :' ,distance_in_cm, 'cm')
  print('An object is detected in :' ,distance_in_mm,'mm')
  

  #for oled display distance 
  

  #check the distance

  if distance_in_cm <250:
      for i in range(100):
        oled.fill(1) #1 mean line number 1
        oled.text("YOU MAY ENTER ", 4,30,0)
        oled.show()
        led.off()
        buzzer.init(freq=1703,duty=400)
        sleep(0.5)
        buzzer.init(freq=1,duty=0)
        sleep(0.5)
  
  elif 50<=distance_in_cm>250:
    for i in range (100):
        oled.fill(1) #1 mean line number 1
        oled.text("WELCOME ", 5,40,0)
        oled.show()
        led.on()
        buzzer.init(freq=1,duty=0)
             

  if SW1.value()==1:
    led2.on()
    
  else:
    buzzer.init(freq=1,duty=0)

    sleep(5)