from machine import Pin, I2C
from i2c_lcd import I2cLcd
import utime

sda = Pin(0)
scl = Pin(1)
i2c = I2C(0, sda = sda, scl = scl, freq=400000)
devices = i2c.scan()
lcd_addr = devices[0]
lcd = I2cLcd(i2c, lcd_addr, 2, 16)
trigger = Pin(14, Pin.OUT)
echo = Pin(15, Pin.IN) 

def update_distance(distance):
    lcd.clear()
    lcd.putstr(f"Distance: {distance:.2f} m")

def update_acceleration(acceleration):
    lcd.clear()
    lcd.putstr(f"Acceleration: {acceleration:.2f} m/s²")

def measure_distance():
    trigger.low()  
    utime.sleep_us(2)  
    trigger.high()  
    utime.sleep_us(5)  
    trigger.low() 
    while echo.value() == 0:
        signaloff = utime.ticks_us() 
    while echo.value() == 1:
        signalon = utime.ticks_us() 
    timepassed = signalon - signaloff 
    distance = (timepassed * 0.0343) / 2 
    update_distance(distance)
    return distance

distances = []
for i in range(5):
    distance = measure_distance()
    distances.append(distance)
    update_distance(distance/100)
    utime.sleep(2)

initial_distance = distances[0]/100  
final_distance = distances[4]/100  
time_interval =8

acceleration = (2*(final_distance - initial_distance)) / (time_interval**2)
update_acceleration(acceleration)