weather_read.py

import smbus
import time

class SHT31:
    def sht31(self):            
        # Get I2C bus
        bus = smbus.SMBus(1)

        # SHT31 address, 0x44(68)
        # Send measurement command, 0x2C(44)
        #		0x06(06)	High repeatability measurement
        bus.write_i2c_block_data(0x44, 0x2C, [0x06])

        time.sleep(0.5)

        # SHT31 address, 0x44(68)
        # Read data back from 0x00(00), 6 bytes
        # Temp MSB, Temp LSB, Temp CRC, Humididty MSB, Humidity LSB, Humidity CRC
        data = bus.read_i2c_block_data(0x44, 0x00, 6)

        # Convert the data
        temp = data[0] * 256 + data[1]
        cTemp = -45 + (175 * temp / 65535.0)
        fTemp = -49 + (315 * temp / 65535.0)
        humidity = 100 * (data[3] * 256 + data[4]) / 65535.0
        return cTemp, humidity

# Output data to screen
#device_weather = SHT31()
#temp, moist = device_weather.sht31()
#print (temp)
#print (moist)