import machine
from machine import Pin, I2C
import time
import ssd1306
i2c = I2C(scl=Pin(22), sda=Pin(21))
oled = ssd1306.SSD1306_I2C(128, 64, i2c)
Trigger = Pin(23, Pin.OUT)
Echo = Pin(34, Pin.IN)
while True:
    Trigger.value(0)
    time.sleep_us(5)  
    Trigger.value(1)
    time.sleep_us(10) 
    Trigger.value(0)
    totaltime = machine.time_pulse_us(Echo, 1, 30000) 
    if totaltime > 0:  
        distance = (totaltime * 0.034) / 2
        oled.fill(0)
        oled.text('Distance: {:.2f} cm'.format(distance), 0, 0)
        oled.show()
        print('Distance: {:.2f} cm'.format(distance))
    else:
        oled.fill(0)
        oled.text('No pulse detected', 0, 0)
        oled.show()
        print('No pulse detected')
    time.sleep(2)