data logger for Visualise Lifestreams

May 18, 2012 by  

This week I have been putting together a little Arduino data logger for our current research collaboration with Philips in our Art & Tech commission project.

Arduino, openlog and TGS2620 gas sensor setup with GSR electrodes

We are exploring the translation of health and lifestyle data into new forms of tangible artefacts and for this we revisited mobile data-capture using Arduino boards to inform our early prototypes.

Alongside some Arduino boards we still had in the office I picked up a current crop of useful bits and pieces from Cool Components  and RS  (OpenLog SD logger + TGS2620 gas sensor) to make a quick, small and simple data-logger  for simple capture of volatile gas proximity and  basic galvanic skin response indicating anxiety levels.

TGS2620 gas sensor and openlog logger module

We need to capture long time periods of this sort of data on the move and thus were looking for a non-PC based data-logging set-up we could build ourselves. The Openlog board from Sparkfun is pretty convenient as it hooks up directly to the Arduino and can take micro-flash cards of large sizes so I got some 8GB cards for our logging exercises which will last for some good amount of data-capture time.

The Openlog board is tiny (literally a bit smaller than a 50 pence coin) and pretty straight forward to work with: It just hooks to the Arduino board in soft-serial mode. The galvanic skin response is better to be redone with an op-amp but a rudimentary approach will do for now for initial sketch-testing as we can always improve on the circuit later.

I will post some more feedback when I have played around with it some more.

Resources:

OpenLog

OpenLog github site documentation and code

Arduino Gas detection Fritzing sketch

 

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