from machine import ADC, Pin, PWM
from time import sleep

adc = ADC(Pin(36))          # create ADC object on ADC pin
adc.read()                  # read value, 0-4095 across voltage range 0.0v - 1.0v

adc.atten(ADC.ATTN_11DB)    # set 11dB input attenuation (voltage range roughly 0.0v - 3.6v)
adc.width(ADC.WIDTH_10BIT)   # set 9 bit return values (returned range 0-1023

def map_analog_to_PWM(value, leftMin, leftMax, rightMin, rightMax):
    # Figure out how 'wide' each range is
    leftSpan = leftMax - leftMin
    rightSpan = rightMax - rightMin

    # Convert the left range into a 0-1 range (float)
    valueScaled = float(value - leftMin) / float(leftSpan)

    # Convert the 0-1 range into a value in the right range.
    return int(rightMin + (valueScaled * rightSpan))


pwm = PWM(Pin(2), freq=50, duty=0) # create and configure in one go


while True:

    analog_in = adc.read()
    duty=map_analog_to_PWM(analog_in, 0, 1023, 0, 100)
    
    print(analog_in)    # read value using the newly configured attenuation and width
    print(duty)
    print("")
    
    pwm.duty(duty)
    sleep(0.1)