import machine
import utime
import random

# Define GPIO pins
TRIG_PIN = machine.Pin(9, machine.Pin.OUT)
ECHO_PIN = machine.Pin(8, machine.Pin.IN)

def measure_distance():
    # Send a 10us pulse to trigger the HC-SR04
    TRIG_PIN.value(1)
    utime.sleep_us(10)
    TRIG_PIN.value(0)
    
    # Measure the duration of the echo pulse with a timeout
    pulse_duration = machine.time_pulse_us(ECHO_PIN, 1, 1000000)  # Set timeout to 1 second
    
    # Calculate distance in centimeters (speed of sound is approximately 34300 cm/s)
    if pulse_duration > 0:  # Ensure valid pulse duration
        return pulse_duration / 2 / 29.1
    else:
        return None  # Return None to indicate an error

while True:
    # Generate a random distance between 0 and 500 cm
    random_distance = random.uniform(0, 500)
    print("Random Distance:", random_distance, "cm")
    
    # Simulate measuring the random distance with the sensor
    # For the sake of simulation, we'll just wait for a random duration
    utime.sleep(random.uniform(0.5, 2))  # Simulate measurement delay
    
    # Get actual distance measurement from the sensor (comment this out if not using an actual sensor)
    # actual_distance = measure_distance()
    # if actual_distance is not None:
    #     print("Actual Distance:", actual_distance, "cm")
    # else:
    #     print("Error: Unable to measure distance")
    
    utime.sleep(2)  # Delay between measurements