# Display Image & text on I2C driven ssd1306 OLED display 
from machine import Pin, I2C
from ssd1306 import SSD1306_I2C
import framebuf
import machine
import utime


trig = Pin(1, Pin.OUT) # trig pin
echo = Pin(0, Pin.IN) # echo pin
Buzzer = Pin(18, Pin.OUT) # Buzzer at pin 18
Buzzer.value(0) # Turn OFF buzzer
 
WIDTH  = 128                                            # oled display width
HEIGHT = 64                                             # oled display height
 
i2c = I2C(0, scl=Pin(17), sda=Pin(16), freq=200000)       # Init I2C using pins GP8 & GP9 (default I2C0 pins)
print("I2C Address      : "+hex(i2c.scan()[0]).upper()) # Display device address
print("I2C Configuration: "+str(i2c))                   # Display I2C config
 
 
oled = SSD1306_I2C(WIDTH, HEIGHT, i2c)                  # Init oled display
 


while True:
    # Clear the oled display in case it has junk on it.
    oled.fill(0)

    trig.value(0)
    utime.sleep_us(5) # Wait until settled

    trig.value(1) # Send trig pulse
    utime.sleep_us(10) # 10 microseconds
    trig.value(0) # Remove trig pulse

    while echo.value() == 0: # Wait for echo 1
        pass
    Tmrstrt = utime.ticks_us()

    while echo.value() == 1: # Wait for echo 0
        pass

    Tmrend = utime.ticks_us()
    Duration = utime.ticks_diff(Tmrend, Tmrstrt)
    distancecm = Duration * 0.0171

    # Add some text
    oled.text("Distance: ", 0, 0)
    oled.text(str(distancecm), 0, 20)

    # Finally update the oled display so the image & text is displayed
    oled.show()


    if distance > 100:
        dely = 0
    elif distance > 70 and distance < 90:
        dely = 600
    elif distance > 50 and distance < 70:
        dely = 400
    elif distance > 30 and distance < 50:
       dely = 300
    elif distance > 10 and distance < 30:
       dely = 200
    elif distance < 10:
       dely = 10
    if distance < 100:
        Buzzer.value(1)
        utime.sleep_ms(dely)
        Buzzer.value(0)
        utime.sleep_ms(dely)