import _thread
import time
from machine import Pin
from machine import ADC

def adc_thread(delay):
    global buttonFlag
    adc=ADC(Pin(34))
    while True:
        if buttonFlag==True:
            raw=adc.read()
            volts=3.3*raw/4095
            print(volts)
        time.sleep_ms(delay)



def button_thread(delay,T):
    global buttonFlag
    LED = 2
    BUTTON=4
    led_pin = Pin(LED, Pin.OUT)
    button_pin = Pin(BUTTON, Pin.IN)
    state=0
    N=int(T/delay)
    counter=0;
    while True:
        
        counter=(counter+1)%N;
        if counter==0:
            led_pin.value(not led_pin.value())

        # FSM impmementation
        if state==0:
            if button_pin.value()==0:
                print('Button pressed')
                state=1
        elif state==1:
            if button_pin.value()==1:
                state=0
                print('Button released')
                buttonFlag=not(buttonFlag)
  
           
        
        time.sleep_ms(delay)

    



buttonFlag=True


_thread.start_new_thread(button_thread,(10,500))
_thread.start_new_thread(adc_thread,(1000,))