import max7219
from machine import Pin, SPI
from time import sleep
from utime import sleep_ms, ticks_us

spi = SPI(0, baudrate=10000000, polarity=1, phase=0, sck=Pin(2),mosi=Pin(3))
ss = Pin(5, Pin.OUT)



class DHT22():
    def __init__(self,gpio):
        self.pin=gpio
        self.pin=Pin(15,mode=Pin.OUT)
        self.pin.high()
        self.ckecksum=0
        self.temperatura=0
        self.humedad=0
        sleep_ms(1)

    def getReading(self):
        DHT=self.pin
        DHT.low()
        sleep_ms(1)
        DHT.init(mode=Pin.IN)
        for i in range(2):
            while DHT.value()==1:
                pass
            while DHT.value()==0:
                pass
        data=0
        t1=ticks_us()
        for i in range(32):
            while DHT.value()==1:
                pass
            while DHT.value()==0:
                pass
            t2=ticks_us()
            data=data<<1
            data=data|((t2-t1)>100)
            t1=t2
        checksum=0
        for i in range(8):
            while DHT.value()==1:
                pass
            while DHT.value()==0:
                pass
            t2=ticks_us()
            checksum=checksum<<1
            checksum=checksum|((t2-t1)>100)
            t1=t2
        byte1=(data>>24&0xFF)
        byte2=(data>>16&0xFF)
        byte3=(data>>8&0xFF)
        byte4=(data & 0xFF)
        self.checksum=(checksum==(byte1+byte2+byte3+byte4)&0xFF)
        self.humedad=((byte1<<8)|byte2)/10.0
        neg=byte3 & 0x80
        self.temperatura=(byte3<<8 | byte4)/10.0
        if neg>0:
            self.temperatura=-self.temperatura

       
while True:
    sleep_ms(10)
    dht=DHT22(15)
    dht.getReading()
    sleep_ms(100)
    msg="ITTG_MCIM, "+"T:"+str(dht.temperatura)+" C,"+"H:"+str(dht.humedad)+ " %"
    length = len(msg)
    length = (length*8)
    display = max7219.Matrix8x8(spi, ss, 4)
    display.brightness(1) # ajuste de intensidad 1 a 15
    display.fill(0)
    display.show()
    sleep(0.1)
    for x in range(32, -length, -1):
        display.text(msg, x, 0, 1)
        display.show()
        sleep(0.12)
        display.fill(0)