``````"""
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ Raspberry Pi Pico HC-SR04 Ultrasonic Sensor (MicroPython)┃
┃                                                          ┃
┃ A program to measure distances using the HC-SR04         ┃
┃ ultrasonic sensor and display the values on an SSD1306   ┃
┃ OLED display or an I2C LCD display connected to a        ┃
┃ Raspberry Pi Pico.                                       ┃
┃                                                          ┃
┃ Copyright (c) 2023 Anderson Costa                        ┃
┃ GitHub: github.com/arcostasi                             ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
"""

from machine import Pin, time_pulse_us
from time import sleep_us, sleep

# Define the GPIO pin numbers for the trigger and echo pins
ECHO_PIN = 26
TRIGGER_PIN = 27

# Initialize trigger and echo pins
trigger = Pin(TRIGGER_PIN, Pin.OUT)
echo = Pin(ECHO_PIN, Pin.IN)

def measure_distance():
# Ensure trigger is low initially
trigger.low()
sleep_us(2)

# Send a 10 microsecond pulse to the trigger pin
trigger.high()
sleep_us(10)
trigger.low()

# Measure the duration of the echo pulse (in microseconds)
pulse_duration = time_pulse_us(echo, Pin.high)

# Calculate the distance (in centimeters) using the speed of sound (343 m/s)
distance = pulse_duration * 0.0343 / 2
return distance

def main():
while True:
# Measure the distance and print the value in centimeters
distance = measure_distance()
print("Distance: {:.2f} cm".format(distance))

# Wait for 1 second before taking the next measurement
sleep(1)

if __name__ == "__main__":
main()
``````