# read the temperature value from Analog Temperature Sensor(NTC), and control the speed of an fan 
# that is directly proportional to the temperature, Use an LED , that brightness is directly
# related to the fan speed, as a fan.

from machine import Pin, ADC, PWM
import time

ntc_pin=ADC(Pin(34))
led_pin=PWM(Pin(32))

while True:
    temp_val=ntc_pin.read_u16()
    print(temp_val)
    led_pin.duty_u16(temp_val)

  #ratio formula: o/p=((i/p-i/p_min)x(o/p_max-o/p_min)/(i/p_max-i/p_min))+o/p_min
  #relationship between (61022-7393) 
  # & (1023-0), where temp_val is input.
    out_value=int((temp_val-7393)*1023/53629)
    print(out_value)

    time.sleep(0.5)