print("Hello, ULTRASONIC")
print("date: 27/11/2023")
print ("created by Nas ")    #nak cari library utk ultra sonic kene search 
#ultra sonic library+python+esp32 
                              


#import all libraries/module
import libarary_ultrasonic
from machine import Pin,PWM
from utime import sleep

#pin declaration
TRIG = Pin(26,Pin.IN)
ECHO = Pin(14,PTin.OUT)
Buzzer=Pin(4,Pin.OUT)

#declare/create object name for sensor with libraries
#object name =library_name.class name (.......)
sensor_sonic = libarary_ultrasonic.HCSR04( trigger_pin=TRIG, echo_pin=ECHO)


#main program 
while True :
 
  #ultra sonic PART
  print("\n====== DISTANCE OF INCOMING OBJECT=======\n")
  Jarak_dalam_cm=sensor_sonic.distance_cm()
  print ('An object is detected within :',Jarak_dalam_cm, 'cm')
  Jarak_dalam_mm =sensor_sonic.distance_mm()
  print ('An object is detected within :',Jarak_dalam_mm, 'mm')

  #buzzer PART
  for abu in range (100):
    tone_buzzer =PWM(Buzzer, freq =1500, duty = 50)
    sleep(0.5)
    tone_buzzer =PWM(Buzzer, freq =1, duty = 0)
    sleep(0.5)


  sleep(5)  # In every 5 sec,ultrasonic will sense a new object within range (limit 400s)


main.py

diagram.json

import machine, time
from machine import Pin

__version__ = '0.2.0'
__author__ = 'Roberto Sánchez'
__license__ = "Apache License 2.0. https://www.apache.org/licenses/LICENSE-2.0"

class HCSR04:
    """
    Driver to use the untrasonic sensor HC-SR04.
    The sensor range is between 2cm and 4m.
    The timeouts received listening to echo pin are converted to OSError('Out of range')
    """
    # echo_timeout_us is based in chip range limit (400cm)
    def __init__(self, trigger_pin, echo_pin, echo_timeout_us=500*2*30):
        """
        trigger_pin: Output pin to send pulses
        echo_pin: Readonly pin to measure the distance. The pin should be protected with 1k resistor
        echo_timeout_us: Timeout in microseconds to listen to echo pin. 
        By default is based in sensor limit range (4m)
        """
        self.echo_timeout_us = echo_timeout_us
        # Init trigger pin (out)
        self.trigger = Pin(trigger_pin, mode=Pin.OUT, pull=None)
        self.trigger.value(0)

        # Init echo pin (in)
        self.echo = Pin(echo_pin, mode=Pin.IN, pull=None)

    def _send_pulse_and_wait(self):
        """
        Send the pulse to trigger and listen on echo pin.
        We use the method `machine.time_pulse_us()` to get the microseconds until the echo is received.
        """
        self.trigger.value(0) # Stabilize the sensor
        time.sleep_us(5)
        self.trigger.value(1)
        # Send a 10us pulse.
        time.sleep_us(10)
        self.trigger.value(0)
        try:
            pulse_time = machine.time_pulse_us(self.echo, 1, self.echo_timeout_us)
            return pulse_time
        except OSError as ex:
            if ex.args[0] == 110: # 110 = ETIMEDOUT
                raise OSError('Out of range')
            raise ex

    def distance_mm(self):
        """
        Get the distance in milimeters without floating point operations.
        """
        pulse_time = self._send_pulse_and_wait()

        # To calculate the distance we get the pulse_time and divide it by 2 
        # (the pulse walk the distance twice) and by 29.1 becasue
        # the sound speed on air (343.2 m/s), that It's equivalent to
        # 0.34320 mm/us that is 1mm each 2.91us
        # pulse_time // 2 // 2.91 -> pulse_time // 5.82 -> pulse_time * 100 // 582 
        mm = pulse_time * 100 // 582
        return mm

    def distance_cm(self):
        """
        Get the distance in centimeters with floating point operations.
        It returns a float
        """
        pulse_time = self._send_pulse_and_wait()

        # To calculate the distance we get the pulse_time and divide it by 2 
        # (the pulse walk the distance twice) and by 29.1 becasue
        # the sound speed on air (343.2 m/s), that It's equivalent to
        # 0.034320 cm/us that is 1cm each 29.1us
        cms = (pulse_time / 2) / 29.1
        return cms