from hcsr04 import HCSR04
from utime import sleep, sleep_us
from machine import SoftI2C, Pin, time_pulse_us, PWM
import oled

# Ultrasonic sensor
ultrasonic_sensor = HCSR04(trigger_pin=5, echo_pin=18)
#buzzer
buzzer = PWM(Pin(2))
buzzer.duty(0)
#led
led = Pin(15,Pin.OUT)
#i2c & oled
i2c = SoftI2C(scl=Pin(22), sda=Pin(21))
oled1 = oled.I2C(128, 64, i2c)

i2c_2 = SoftI2C(scl=Pin(23), sda=Pin(19))
oled2 = oled.I2C(128, 64, i2c_2)

while True:
      distance = ultrasonic_sensor.get_distance_cm()
      oled1.clear()
      oled1.text('Distance: ' + str(distance), 10, 3)
      oled1.show()
      if distance < 70 :
        led.on()
        buzzer.freq(1000)   # 1000Hz tone
        buzzer.duty(512)    # 50% duty cycle
        oled2.clear()
        oled2.text("warning!!", 10, 3)
        oled2.show()
      else:
        led.off()
        buzzer.duty(0)
        oled2.clear()
        oled2.text("", 10, 3)
        oled2.show()