simple_SHT31.py

#*****************************************************************************#
#													                            	
#		SHT3x - Sensirion Temperature Humidity sensor	      
#														                            
#		Simple script.									                   
#														                           
#		Olivier den Ouden								                    
#		Royal Netherlands Meterological Institute		        
#		RD Seismology and Acoustics						              
#		https://www.seabirdsound.org 					              
#														                            
#*****************************************************************************#

# Modules
import smbus
import time
import numpy as np

bus = smbus.SMBus(1)

# SHT3x hex adres
SHT3x_ADDR		= 0x44
SHT3x_SS		= 0x2C
SHT3x_HIGH		= 0x06
SHT3x_READ		= 0x00

# MS to SL
bus.write_i2c_block_data(SHT3x_ADDR,SHT3x_SS,[0x06])
time.sleep(0.2)

# Read out data
data = bus.read_i2c_block_data(SHT3x_ADDR,SHT3x_READ,6)

# Devide data into counts Temperature
t_data = data[0] << 8 | data[1]

# Devide data into counts Humidity
h_data = data[3] << 8 | data[4]

# Convert counts to Temperature/Humidity
Humidity = 100.0*np.float(h_data)/65535.0
Temperature = -45.0 + 175.0*np.float(t_data)/65535.0

# Print Temperature and Humdity
print("Temp: %0.2f C  H: %0.2f % ") % (Temperature,Humidity)