from machine import Pin, time_pulse_us
import time

SOUND_SPEED=340 
TRIG_PULSE_DURATION_US=10

trig_pin = Pin(28, Pin.OUT) 
echo_pin0 = Pin(27, Pin.IN)  
echo_pin1 = Pin(26, Pin.IN) 
echo_pin2 = Pin(22, Pin.IN)
echo_pin3 = Pin(21, Pin.IN)


while True:
    
    trig_pin.value(0)
    time.sleep_us(5)
    
    trig_pin.value(1)
    time.sleep_us(TRIG_PULSE_DURATION_US)
    trig_pin.value(0)

    
    ultrason_duration = time_pulse_us(echo_pin0, 1, 30000) 
    distance_cm = SOUND_SPEED * ultrason_duration / 20000
       
    print(f"Distance : {distance_cm} cm")
    time.sleep_ms(500)