from machine import Pin
import utime

trigger = Pin(27, Pin.OUT)
echo = Pin(26, Pin.IN)

MAX_DISTANCE_CM = 400  # Set your maximum measurable distance

def ultra():
    trigger.low()
    utime.sleep_us(2)
    trigger.high()
    utime.sleep_us(5)
    trigger.low()
    
    while echo.value() == 0:
        signaloff = utime.ticks_us()
    while echo.value() == 1:
        signalon = utime.ticks_us()
    
    timepassed = signalon - signaloff
    distance = (timepassed * 0.0343) / 2
    percentage = min(100, max(0, (distance / MAX_DISTANCE_CM) * 100))  # Clamp between 0–100%
    
    print("Distance: {:.2f} cm | Percentage: {:.2f}%".format(distance, percentage))

while True:
    ultra()
    utime.sleep(1)