print("Program: To measure an object distance")
print ("Date 7/11/24")
print (" Created by: Nilla")

#import modules/libraries
import ultrasonic_library
from machine import Pin, PWM
from utime import sleep

#Pin declaration 
trigger_pin = Pin(26, Pin.IN)
echo_pin = Pin(5, Pin.IN)
red_led_pin = Pin(14, Pin.OUT)
buzzer_pin = PWM(Pin(4, Pin.OUT))

#Object declaration
reverse_sensor = ultrasonic_library.HCSR04 (trigger_pin=trigger_pin, echo_pin=echo_pin)


#Parameter declaration 

#Main Program
while True:
  distance_from_wall = reverse_sensor.distance_cm()
  print("The car is", distance_from_wall, "cm from the wall")
  print ("-------------------------------------------------")
  sleep(1)

  if distance_from_wall <=200:
    for m in range (10):
            red_led_pin.on()
            buzzer_pin.init(freq=3200 , duty=50)
            sleep(1)
            red_led_pin.off()
            buzzer_pin.init(freq=3200 , duty=0)
            sleep(1)

  if distance_from_wall <=50:   
    for m in range (10):  
                red_led_pin.on()
                buzzer_pin.init(freq=100 , duty=100)
                sleep(0.05)
                red_led_pin.off()
                buzzer_pin.init(freq=100 , duty=0)
                sleep(0.05)


else:
    red_led_pin.off()


sleep(1)