from machine import Pin
from time import sleep, sleep_us

PD_SCK = Pin(22, Pin.OUT)
DOUT = Pin(21, Pin.IN)

PD_SCK.value(0)
sleep(1)

def read_raw():
    while DOUT.value() == 1:
        sleep_us(50)   # cede tempo ao sistema, evita reset por watchdog

    value = 0
    for i in range(24):
        PD_SCK.value(1)
        sleep_us(1)
        PD_SCK.value(0)
        sleep_us(1)
        value = (value << 1) | DOUT.value()

    PD_SCK.value(1)
    sleep_us(1)
    PD_SCK.value(0)
    sleep_us(1)

    if value & 0x800000:
        value -= 0x1000000
    return value

print("Leituras cruas:")
for i in range(20):
    v = read_raw()
    print(i, ":", v)
    sleep(0.2)