from time import sleep, ticks_ms
from machine import ADC
#from oled_plot import plot
from machine import Pin
import math
button_pressed = False
last_button_time_stamp = 0

def int_handler(pin):
    global button_pressed
    global last_button_time_stamp
    current_button_time = ticks_ms()
    button_press_delta = current_button_time - last_button_time_stamp
    if button_press_delta > 200:
        last_button_time_stamp = current_button_time
        button_pressed = True
        # print(f'key pressed')
def main():
    global button_pressed

    ntc = machine.ADC(Pin(26))
    MEASUREMENT_COUNT=16
    ADC_RANGE = float((math.pow(2, 16) - 1))

    button_1 = Pin(15, Pin.IN, Pin.PULL_UP)
    button_1.irq(trigger=Pin.IRQ_FALLING, handler=int_handler)

    while True:
        if button_pressed is True:
            button_pressed = False

            # Read ADC digital output
            digital_val = ntc.read_u16()
            total_value = 0
            # Calculate analog value
            for _ in range(MEASUREMENT_COUNT):

                total_value += ntc.read_u16()
                average_value = total_value // MEASUREMENT_COUNT
                temp = round(1 / (math.log(1 / (ADC_RANGE / average_value - 1)) / 3950 + 1.0 / 298.15) - 273.15, 1)

            # Plot analog value
            #plot(temp)
            print(temp)

        # sleep(.05)

if __name__ == "__main__":
    main()