I will leave this lot running for a while, some ds18b20 temp sensors, a bme280 and the raspberry with a bme680 see what happens.

I have noticed the gas resistance readings are very steppy

```
this example I blow some smoke at the sensors
2017-11-25,13:34:50,22.89,C,1006.87,hPa,34.74,%RH,222496,Ohms
2017-11-25,13:34:52,22.89,C,1006.89,hPa,34.75,%RH,223521,Ohms
2017-11-25,13:34:54,22.89,C,1006.89,hPa,34.76,%RH,223154,Ohms
2017-11-25,13:34:56,22.89,C,1006.89,hPa,34.76,%RH,216334,Ohms
2017-11-25,13:34:58,22.88,C,1006.91,hPa,34.86,%RH,146080,Ohms
2017-11-25,13:35:00,22.88,C,1006.91,hPa,34.97,%RH,141187,Ohms
2017-11-25,13:35:02,22.87,C,1006.88,hPa,35.07,%RH,136288,Ohms
2017-11-25,13:35:04,22.87,C,1006.89,hPa,35.22,%RH,131018,Ohms
2017-11-25,13:35:06,22.86,C,1006.90,hPa,35.36,%RH,125136,Ohms
2017-11-25,13:35:08,22.86,C,1006.88,hPa,35.53,%RH,120637,Ohms
2017-11-25,13:35:10,22.85,C,1006.89,hPa,35.69,%RH,116924,Ohms
2017-11-25,13:35:12,22.84,C,1006.89,hPa,35.80,%RH,115055,Ohms
2017-11-25,13:35:14,22.84,C,1006.87,hPa,35.87,%RH,114598,Ohms
2017-11-25,13:35:16,22.83,C,1006.87,hPa,35.88,%RH,115017,Ohms
2017-11-25,13:35:18,22.83,C,1006.89,hPa,35.86,%RH,115710,Ohms
2017-11-25,13:35:20,22.83,C,1006.91,hPa,35.84,%RH,117162,Ohms
when it clears it will massive switch from 140000 or so up to the 222000 scale again
2017-11-25,13:38:54,22.85,C,1006.94,hPa,35.04,%RH,148147,Ohms
2017-11-25,13:38:56,22.85,C,1006.93,hPa,35.03,%RH,148465,Ohms
2017-11-25,13:38:58,22.86,C,1006.93,hPa,35.02,%RH,148593,Ohms
2017-11-25,13:39:00,22.86,C,1006.93,hPa,35.00,%RH,148784,Ohms
2017-11-25,13:39:02,22.86,C,1006.93,hPa,35.00,%RH,213079,Ohms
2017-11-25,13:39:04,22.85,C,1006.93,hPa,35.00,%RH,148656,Ohms
2017-11-25,13:39:06,22.85,C,1006.93,hPa,35.00,%RH,213145,Ohms
2017-11-25,13:39:08,22.85,C,1006.94,hPa,35.01,%RH,149041,Ohms
2017-11-25,13:39:10,22.85,C,1006.93,hPa,35.03,%RH,148913,Ohms
2017-11-25,13:39:12,22.85,C,1006.94,hPa,35.04,%RH,148977,Ohms
2017-11-25,13:39:14,22.85,C,1006.94,hPa,35.05,%RH,148784,Ohms
2017-11-25,13:39:16,22.85,C,1006.94,hPa,35.07,%RH,213480,Ohms
2017-11-25,13:39:18,22.85,C,1006.95,hPa,35.07,%RH,213346,Ohms
2017-11-25,13:39:20,22.84,C,1006.95,hPa,35.06,%RH,213346,Ohms
2017-11-25,13:39:22,22.84,C,1006.96,hPa,35.04,%RH,213346,Ohms
```