# modules
from machine import Pin,PWM,ADC
from time import sleep
from dht import DHT22

dht = DHT22(Pin(22)) 
ldr = ADC(28)
fire = ADC(27)
pir = Pin(0, Pin.IN)
relay=Pin(11,Pin.OUT)
warningled=Pin(17,Pin.OUT)

#SERVO
SERVO_MIN_PULSE_WIDTH = 500
SERVO_MAX_PULSE_WIDTH = 2500
servo = PWM(Pin(3))
servo.freq(50)

def angle_to_pulse_width(angle):
    pulse_width = (SERVO_MAX_PULSE_WIDTH - SERVO_MIN_PULSE_WIDTH) * (angle / 180) + SERVO_MIN_PULSE_WIDTH
    return int(pulse_width)

def moveServo(angle):  
    pulse_width = angle_to_pulse_width(angle)
    servo.duty_u16(int(pulse_width / (1000000 / 50 / 65535)))
    sleep(0.5)

def scaleIntensity(val, src, dist):
    '''
    Map the LDR analog value to a range of 0-100 (%)

    Keys:
    src = [lowestLDRValue, highestLDRValue]
    dist = [minValue, maxValue]
    '''
    return int(((val - src[0]) / (src[1]-src[0])) * (dist[1]-dist[0]) + dist[0])

def Alarm():
    buzzer = PWM(Pin(26))
    buzzer.freq(3000)
    buzzer.duty_u16(1000)
    warningled.toggle()
    sleep(0.2)
    buzzer.duty_u16(0)
    warningled.toggle()
    
while True:
    # getting sensor readings
    dht.measure()
    temp = dht.temperature()
    hum = dht.humidity()
    percentLDR = scaleIntensity(ldr.read_u16(), [65007, 512], [0,100])
    percentFire = scaleIntensity(fire.read_u16(), [65007, 512], [0,100])
    pirv = pir.value()

    print(f"Temp: {temp}°C   Humid: {hum}%  LDR: {percentLDR}%  Fire: {percentFire}%    PIR: {pirv}%")

    if (percentFire == 100): #Detect Fire
        Alarm() #Turns on Alarm
    
    if (pirv == 1): #Detect Movement at Night or Armed (boleh guna blynk untuk arm alarm)
        Alarm() #Turns on Alarm

    if (percentLDR < 40):#If Dark
        relay.value(1) #Switch on Lights

    elif (temp > 30): #If hot
        moveServo(0) #Dispense Water Vapour
    
    else:
        relay.value(0)