sgp30 0.1.1

Library for reading data from the sensiron SGP30

Copyright (c) 2018 Simon Albinsson

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Description: # RPI_SGP30

Program to read eCO_2 and TVOC from the [SGP30 sensor](https://www.sensirion.com/fileadmin/user_upload/customers/sensirion/Dokumente/9_Gas_Sensors/Sensirion_Gas_Sensors_SGP30_Datasheet_EN.pdf). Based on the smbus2 i2c library for ease of use.


Quick usage-example:

from sgp30 import Sgp30
import time
with SMBusWrapper(1) as bus:
sgp=Sgp30(bus,baseline_filename="/tmp/mySGP30_baseline") #things thing with the baselinefile is dumb and will be changed in the future
print("resetting all i2c devices")
sgp.i2c_geral_call() #WARNING: Will reset any device on teh i2cbus that listens for general call
print(sgp.read_features())
print(sgp.read_serial())
sgp.init_sgp()
print(sgp.read_measurements())
print("the SGP30 takes at least 15 seconds to warm up, 12 hours before the readigs become really stable"
for i in range(20):
time.sleep(1)
print(".",end="")
print()
print(sgp.read_measurements())

## Features that are known to be missing (listing in rough order of importance):
* Fix python3 compatibility.
* The handing of baseline values are not that great, it should probably be up to the end user to save and restore them as needed.
* Write doc-strings for all or at least most methods.
* reading raw-values.
* A more "driver like" class that took care of all chip identification, polling intervals store baseline and so on.

If you have the AdaFruit board with built in level shifters and voltage regulator it is should work if you just plug in [SDA to pin 3, SCL to pin 5, VCC to pin 17 and GND to pin 20](https://pinout.xyz/pinout/i2c). You should then be able to find the SGP30 an address 0x58 using `i2cdetect -y 1`. If you get an error message you probbably need to enable i2c in the kernel using [`raspi-config` and reboot](https://learn.sparkfun.com/tutorials/raspberry-pi-spi-and-i2c-tutorial)


Platform: UNKNOWN