from machine import Pin, I2C
import time
from lcd_api import LcdApi
from i2c_lcd import I2cLcd
from machine import Pin, Timer
import time

# --- I2C LCD Setup ---
i2c = I2C(0, sda=Pin(0), scl=Pin(1), freq=400000)
lcd_addr = i2c.scan()[0]
lcd = I2cLcd(i2c, lcd_addr, 2, 16)

LED = Pin(15,Pin.OUT)

# --- Ultrasonic Sensor Pins ---
TRIG = Pin(3, Pin.OUT)
ECHO = Pin(2, Pin.IN)
    
# Function to measure distance
def measure_distance():
    TRIG.low()
    time.sleep_us(2)
    TRIG.high()
    time.sleep_us(10)
    TRIG.low()

    while ECHO.value() == 0:
        signaloff = time.ticks_us()

    while ECHO.value() == 1:
        signalon = time.ticks_us()

    duration = time.ticks_diff(signalon, signaloff)
    distance_cm = (duration * 0.00343) / 2
    return distance_cm

# --- Main Loop ---
lcd.putstr("Distance:")

while True:
    try:
        distance = measure_distance()
        lcd.move_to(0, 1)
        lcd.putstr("Dist: {:5.2f} cm".format(distance))
        if distance > 15:
            LED.value(1)
        else:
            LED.value(0)
    except:
        lcd.move_to(0, 1)
        lcd.putstr("Sensor Error    ")
    time.sleep(1)