from machine import Pin
import time

ir_pin = Pin(14, Pin.IN)

def read_ir():
    pulses = []
    t0 = time.ticks_us()

    while ir_pin.value() == 1:
        pass

    while len(pulses) < 100:
        val = ir_pin.value()
        t1 = time.ticks_us()
        while ir_pin.value() == val:
            if time.ticks_diff(time.ticks_us(), t0) > 100000:
                return pulses
        t0 = time.ticks_us()
        pulses.append(time.ticks_diff(t0, t1))
    return pulses

def decode_nec(pulses):
    if len(pulses) < 66:
        return None
  
    bits = ""
    for i in range(2, 66, 2):  # skip start pulse
        if pulses[i+1] > 1000:  # long space = "1"
            bits += "1"
        else:                   # short space = "0"
            bits += "0"

    # Convert bits to int
    try:
        value = int(bits, 2)
        return hex(value)
    except:
        return None

while True:
    pulses = read_ir()
    if pulses:
        code = decode_nec(pulses)
        if code:
            print("IR Code:", code)