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Author Topic: SG Datalogger  (Read 1942 times)
stephendv
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« on: January 31, 2011, 08:47:19 PM »

A working JSA photonics specific gravity sensor arrived the other day and I took it out for a test drive over the weekend.  All looks very promising:
http://www.casanogaldelasbrujas.com/blog/2011/01/31/sg-data-logger-first-steps/

As soon as nuelectronics return from holiday, I'll add a display and the datalogger shield and my existing GPRS shield.  Then program that little beauty to log SG readings every 10 mins, upload them to pachube once a week (or more frequently depending on my data charges).  That'll be the base functionality, then it would be quick and easy to add some nice features:
- Send SMS or email if SG dips dangerously low
- Control the generator.
One of the potential benefits of SG based generator control is that it could monitor SG and if it doesn't change over a 2 hour period, then assume that charging is done.  Will have to do more testing before I let it control the generator though!


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2.8kW PV, SMA Sunny Island 5048, 5 PzS 700 battery bank, stinky diesel.
stephendv
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« Reply #1 on: February 16, 2011, 10:35:43 AM »

Data logging shield from nuelectronics hasn't arrived yet, but in the meantime I have the sensor working over SMS.  So I can find out the status of my batteries anywhere, anytime Smiley  The arduino replies with:
- Specific gravity
- Temperature
- Temperature corrected SG
- State of charge

At the moment I'm using a table that maps SG to State of charge published by Rolls, but I'd prefer to use something more specific to OPzS - any pointers?



* IMG00149-20110216-1127.jpg (105.8 KB, 740x555 - viewed 380 times.)
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2.8kW PV, SMA Sunny Island 5048, 5 PzS 700 battery bank, stinky diesel.
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