#Reading analog voltage
from machine import Pin 
from time import sleep #import sleep from time function in the libary
potPin=Pin(28) # pin 28 as an input. 
myPot=machine.ADC(potPin) #analog to digital converter pin
ledPin=6 #GPIO 6
alarmLed=Pin(ledPin,Pin.OUT) #writes digital out to ledPin
#alarm=6 # alarm signal on Pin 6
#ledPin=Pin(alarm,Pin.OUT)



while True: #True is always true
    # everything indented runs within the while statement
    potVal=myPot.read_u16() # output a digital value using 16 bit ADC
    print('potVal= ',potVal) # would be 0 to 65535 (max value =2^16 -1 because starts at 0 )
    sleep(1)
    #lowest reading = 0 --> 0 volts, highest reading 65535 -->3.3 Volts
    #y=mx+c--> volts=(3.3/65535)*potVal
    voltage=(3.3/65535)*potVal
    print('Voltage= ',voltage, 'V')
    sleep(1)
    if voltage >=2:
        alarmLed.value(1)
    if voltage <2:
        alarmLed.value(0)
           


    # can also use toggle() if LED is on it will turn off and vice versa (e.g)
    # myLED.toggle()
    # sleep(.5)