from hcsr04 import HCSR04
from machine import Pin,I2C
import ssd1306,time
 
i2c = I2C(scl=Pin(21), sda=Pin(22)) #Init i2c 
oled=ssd1306.SSD1306_I2C(128,64,i2c,0x3c)
buzzer=Pin(4,Pin.OUT)
sensor = HCSR04(trigger_pin=5,echo_pin=18,echo_timeout_us=1000000)
 
while True:
    distance = sensor.distance_cm() 
    print(distance,' cm')
    time.sleep_ms(100)
    oled.fill(0)
    oled.text("Distance:",30,20)
    oled.text(str(distance),30,40)
    oled.text("cm",30,50)
    oled.show() # afficher la distance entre le capteur et l'objet
    if (distance<4):
        buzzer.value(1) # buzzer sonne
    else:
        buzzer.value(0) # buzzer s'arrete de sonner