SHT31UP.py

#-------------------SHT31-------------------------------
#|     Time  | Version | Contribution | Comment
#| 2017.6.22|  0       |  fork form http://www.pibits.net/code/raspberry-pi-sht31-sensor-example.php
#| 2017.6.24 | 1     | H.F.         | Work :)
#---------------------------------------------------------------
import smbus
import time


# Get I2C bus
bus = smbus.SMBus(1)

time0=time.strftime("%Y%m%d%H%M",time.localtime())
datestore='/home/pi/Desktop/SHT/'+time0+'SHTUP'+'.txt'
ticks0=time.time()
while True:
	# SHT31 address, 0x44(68)
	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)
	humidity = 100 * (data[3] * 256 + data[4]) / 65535.0
	ticks = time.time()

	# Output data to screen
	print("%.2f "%(ticks-ticks0)+"Temp%.2f "%cTemp+"RH%.2f"%humidity)

	try:
	    record = open(datestore, 'a')    
	    record.write(str(ticks)+",")
	    record.write(str(cTemp)+",")           
	    record.write(str(humidity)+","+"\n")
	finally:
	    if record:
	        record.close()
	# http://www.pibits.net/wp-content/uploads/2016/11/pi-and-sht31_bb.png