import time
from machine import Pin, ADC
from utime import sleep
import math

#------------------------------------------------------------#
#Definition of pin numbers
#------------------------------------------------------------#

Motion_pin = 15
Temp_pin = 26
Led_pin = 1
Button_pin = 0
BETA = 3950

#------------------------------------------------------------#
#Definition of pin directions
#------------------------------------------------------------#
Motion_Sensor = Pin(Motion_pin,Pin.IN, Pin.PULL_DOWN)
Temp_Sensor = ADC(Pin(Temp_pin))
Led = Pin(Led_pin, Pin.OUT)
Button = Pin(Button_pin, Pin.IN, Pin.PULL_DOWN)

#------------------------------------------------------------#
#Global variables definition
#------------------------------------------------------------#
ref_time = 0
ForcedMode = 0

#------------------------------------------------------------#
#Interrupt function
#------------------------------------------------------------#
def interrupt_fun(pin):
    global ref_time, ForcedMode
    current_time = time.ticks_ms()
    diff = current_time - ref_time
    if diff > 200:
        ForcedMode = 1
        ref_time = current_time

Button.irq(trigger = Pin.IRQ_FALLING, handler = interrupt_fun)

#------------------------------------------------------------#
#Main function
#------------------------------------------------------------#
def main():

    while True:
        global ForcedMode
        motion_detect = Motion_Sensor.value()
        temp_value = Temp_Sensor.read_u16()
        celsius = 1 / (math.log(1 / (65535. / temp_value - 1)) / BETA + 1.0 / 298.15) - 273.15
        
        #--------------------------- Case 1 ---------------------------------#
        #Forced Mode happens if the button is pressed
        #Door shall be forced open for one second
        #Led shall be ON
        #Print "Forced Mode, Door is Open"
        if ForcedMode:
            print("Forced Mode, Door is Open")
            Led.value(1)
            sleep(2)
            ForcedMode = 0
        
        #--------------------------- Case 2 ---------------------------------#
        #Motion is detected and the temp. is in normal range which is below 40 c
        #Door shall open for 2 seconds
        #Led shall be ON
        #Print "Motion is detected and Temp is good, Door is open"
        if motion_detect and celsius < 40:
            print("Motion is detected and Temp is good, Door is open")
            Led.value(1)
            sleep(1)

        #--------------------------- Case 3 ---------------------------------#
        #Motion is detected but the temp. is too high which is above 40 c  
        #Door shall close   
        #Led shall be OFF
        #Print "Can't open the door, Temp is {celsius} too high"
        elif motion_detect and celsius > 40:
            print(f"Can't open the door, Temp is {celsius} too high")
            Led.value(0)
            sleep(1)

        #--------------------------- Case 4 ---------------------------------#
        #Motion is not detected
        #Door is closed    
        #Led shall be OFF
        #Print "Door is closed"
        else:
            print("Door is closed")
            Led.value(0)
            sleep(1)            

if __name__ == "__main__":
    main()