Hello again,
I have already done some prelimanary testing myself , as I used the system in Demola premises for about an hour, the potentiometer stayed in setting 246 for the whole time, so not much pollutants there I guess, but now is time to move towards the actual testing.
The project is moving towards deadline on 20.6, on which date we will have the final presentation.
Me , Anju and Sumita met today (wed 6.6) and decided some dates considering the testing.
We will have a meeting on Friday 8.6 over the lunch to test the system at the university restaurant. And then do some testing going around the city on Thursday 20.6 , trying the sensoring fro about fifteen minutes in several different places such as market squares, coffee places, fastfood restaurants and bars.
Also when Chris gets back from his holiday before the final meeting, we will finish a demo of the project together.
I found a good list of voc´s to think considering the testing environments:
http://www.health.ny.gov/environmental/indoors/voc.htm
For testing purposes we also need to figure out carefully the levels for the potentiometer we are going to use and stick to them.
Also previously we had followed this one "how to smell pollutants" project partly. Seems the guy behind this project has used the following levels:
"With ~4 days burn-in and ambient temperature of 63F, the values I read in my house were (which is reasonably free of chemical use):
-sitting in the open air, after sensor warms up for ~1 minute: 52
-breathing slowly over the sensor for several seconds: 73
-holding sensor directly over an open bottle of grain alcohol: 235 "
I have already done some prelimanary testing myself , as I used the system in Demola premises for about an hour, the potentiometer stayed in setting 246 for the whole time, so not much pollutants there I guess, but now is time to move towards the actual testing.
The project is moving towards deadline on 20.6, on which date we will have the final presentation.
Me , Anju and Sumita met today (wed 6.6) and decided some dates considering the testing.
We will have a meeting on Friday 8.6 over the lunch to test the system at the university restaurant. And then do some testing going around the city on Thursday 20.6 , trying the sensoring fro about fifteen minutes in several different places such as market squares, coffee places, fastfood restaurants and bars.
Also when Chris gets back from his holiday before the final meeting, we will finish a demo of the project together.
I found a good list of voc´s to think considering the testing environments:
http://www.health.ny.gov/environmental/indoors/voc.htm
For testing purposes we also need to figure out carefully the levels for the potentiometer we are going to use and stick to them.
Also previously we had followed this one "how to smell pollutants" project partly. Seems the guy behind this project has used the following levels:
"With ~4 days burn-in and ambient temperature of 63F, the values I read in my house were (which is reasonably free of chemical use):
-sitting in the open air, after sensor warms up for ~1 minute: 52
-breathing slowly over the sensor for several seconds: 73
-holding sensor directly over an open bottle of grain alcohol: 235 "
We have currently set our sensor on normal level ~250, where the light is green. Changing to blue at 300. and to red at 350. So maybe we should still recalibrate it a bit if the numbers rise so much when the there is actually voc:s. Btw. The model of our sensor is: Figaro TGS 2602 , http://www.figarosensor.com/products/2602pdf.pdf
- Mikko
One document of voc-sensor functionality:
VastaaPoistahttp://www.appliedsensor.com/pdfs/AppliedSensor_iAQ_WhitePaper_DCVBeyondCO2.pdf
Connecting roomba to voc sensoring (by hacking) :
VastaaPoistahttp://publiclaboratory.org/wiki/roomba-indoor-air-quality-mapping