import dht11
import datetime
import RPi.GPIO as GPIO

# initialize GPIO
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)

# DHT11 Sensor Operation
def dht11_data():

    # read data using pin 14
    instance = dht11.DHT11(pin=14)
    
    count = 0

    while True:
        result = instance.read()
        if result.is_valid():
            t1 = '%3.1f' % result.temperature
            h1 = '%3.1f' % result.humidity
#            print(datetime.datetime.now())
            print('Temperature: ' + t1 + ' C')
            print('Humidity: ' + h1 + ' %')
            break
        else:
            if count > 10:
                t1 = '***'
                h1 = '***'
                print('invalid data')
                break
	count += 1

    return t1, h1


if __name__ == '__main__':
    dht11_data()