from machine import Pin, I2C, SoftI2C
import time
from hcsr04 import HCSR04
from lcd_api import LcdApi
from i2c_lcd import I2cLcd
button_pressed = 0
last_button_time_stamp = 0
button = Pin(18, Pin.IN, Pin.PULL_DOWN)
US = HCSR04(25, 26)

I2C_ADDR = 0x27  
totalRows = 2  
totalColumns = 16 
i2c = SoftI2C(scl=Pin(22), sda=Pin(21), freq=10000) 				#initializing the I2C method for ESP32  
#i2c = I2C(scl=Pin(5), sda=Pin(4), freq=10000) 						#initializing the I2C method for ESP8266  
 
lcd = I2cLcd(i2c, I2C_ADDR, totalRows, totalColumns) 


def int_handler(pin):
    global button_pressed

    global last_button_time_stamp

    cur_button_ts = time.ticks_ms()
    button_press_delta = cur_button_ts - last_button_time_stamp
    if button_press_delta > 200:
        last_button_time_stamp = cur_button_ts
        button_pressed = button_pressed + 1

        if button_pressed == 5:
            button_pressed = 1


def measure_distance():
    distance = US.distance_cm()
    return distance

def display_distance(distance):
    lcd.clear()
    lcd.putstr(str(distance)) 	 
		

def main():
    button.irq(trigger = Pin.IRQ_FALLING, handler = int_handler)
    while True:
        if button_pressed > 2:
            CM = measure_distance()
            display_distance(CM)
            time.sleep(1)

if __name__ == "__main__":
    main()